for (var i=0; i < array.length; i++)
  myFunction(array[i]);

array.forEach(function(item, i){
  myFunction(item)
});

myFunction(item) for item in array

var i, item, len;

for (i = 0, len = array.length; i < len; i++) {
  item = array[i];
  myFunction(item);
}

var result = []
for (var i=0; i < array.length; i++)
  result.push(array[i].name)

var result = array.map(function(item, i){
  return item.name;
});

result = (item.name for item in array)

var item, result;

result = (function() {
  var i, len, results;
  results = [];
  for (i = 0, len = array.length; i < len; i++) {
    item = array[i];
    results.push(item.name);
  }
  return results;
})();

var result = []
for (var i=0; i < array.length; i++)
  if (array[i].name == "test")
    result.push(array[i])

result = array.filter(function(item, i){
  return item.name == "test"
});

result = (item for item in array when item.name is "test")

var item, result;

result = (function() {
  var i, len, results;
  results = [];
  for (i = 0, len = array.length; i < len; i++) {
    item = array[i];
    if (item.name === "test") {
      results.push(item);
    }
  }
  return results;
})();

var i, item, len, result;

for (i = 0, len = array.length; i < len; i++) {
  item = array[i];
  if (item.name === "test") {
    result = item;
  }
}

passed = []
failed = []
(if score > 60 then passed else failed).push score for score in [49, 58, 76, 82, 88, 90]

# Or
passed = (score for score in scores when score > 60)

passed = []
failed = []
for score in [49, 58, 76, 82, 88, 90]
  (if score > 60 then passed else failed).push score

var failed, i, len, passed, ref, score;

passed = [];

failed = [];

ref = [49, 58, 76, 82, 88, 90];
for (i = 0, len = ref.length; i < len; i++) {
  score = ref[i];
  (score > 60 ? passed : failed).push(score);
}

<?xml version="1.0" encoding="utf-8"?>
<license id="17d46246-a6cb-4196-98a0-ff6fc08cb67f" expiration="2012-06-12T00:00:00.0000000" type="Trial" prof="EFProf">
  <name>MyName</name>
  <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
    <SignedInfo>
      <CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" />
      <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" />
      <Reference URI="">
        <Transforms>
          <Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature" />
        </Transforms>
        <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
        <DigestValue>b8N0bDE4gTakfdGKtzDflmmyyXI=</DigestValue>
      </Reference>
    </SignedInfo>
    <SignatureValue>IPELgc9BbkD8smXSe0sGqp5vS57CtZo9ME2ZfXSq/thVu...=</SignatureValue>
  </Signature>
</license>

        public static string CreateRSAKeyPair(int dwKeySize = 1024)
        {
            using (var provider = new RSACryptoServiceProvider(dwKeySize))
            {
                return provider.ToXmlString(includePrivateParameters: true);
            }
        }

namespace SignedXmlSample
{
    public enum LicenseType
    {
        None,
        Trial,
        Standard,
        Personal
    }
}

using System;
using System.Xml.Serialization;

namespace SignedXmlSample
{
    public class License
    {
        [XmlAttribute]
        public Guid Id { set; get; }
        
        public string Domain { set; get; }

        [XmlAttribute]
        public string IssuedTo { set; get; }

        [XmlAttribute]
        public DateTime Expiration { set; get; }

        [XmlAttribute]
        public LicenseType Type { set; get; }
    }
}

using System;
using System.IO;
using System.Security.Cryptography; // needs a ref. to `System.Security.dll` asm.
using System.Security.Cryptography.Xml;
using System.Text;
using System.Xml;
using System.Xml.Serialization;

namespace SignedXmlSample
{
    public static class LicenseGenerator
    {
        public static string CreateLicense(string licensePrivateKey, License licenseData)
        {
            using (var provider = new RSACryptoServiceProvider())
            {
                provider.FromXmlString(licensePrivateKey);
                var xmlDocument = createXmlDocument(licenseData);
                var xmlDigitalSignature = getXmlDigitalSignature(xmlDocument, provider);
                appendDigitalSignature(xmlDocument, xmlDigitalSignature);
                return xmlDocumentToString(xmlDocument);
            }
        }

        public static string CreateRSAKeyPair(int dwKeySize = 1024)
        {
            using (var provider = new RSACryptoServiceProvider(dwKeySize))
            {
                return provider.ToXmlString(includePrivateParameters: true);
            }
        }

        public static License ReadLicense(string licensePublicKey, string xmlFileContent)
        {
            var doc = new XmlDocument();
            doc.LoadXml(xmlFileContent);

            using (var provider = new RSACryptoServiceProvider())
            {
                provider.FromXmlString(licensePublicKey);

                var nsmgr = new XmlNamespaceManager(doc.NameTable);
                nsmgr.AddNamespace("sig", "http://www.w3.org/2000/09/xmldsig#");

                var xml = new SignedXml(doc);
                var signatureNode = (XmlElement)doc.SelectSingleNode("//sig:Signature", nsmgr);
                if (signatureNode == null)
                    throw new InvalidOperationException("This license file is not signed.");

                xml.LoadXml(signatureNode);
                if (!xml.CheckSignature(provider))
                    throw new InvalidOperationException("This license file is not valid.");

                var ourXml = xml.GetXml();
                if (ourXml.OwnerDocument == null || ourXml.OwnerDocument.DocumentElement == null)
                    throw new InvalidOperationException("This license file is coruppted.");

                using (var reader = new XmlNodeReader(ourXml.OwnerDocument.DocumentElement))
                {
                    var xmlSerializer = new XmlSerializer(typeof(License));
                    return (License)xmlSerializer.Deserialize(reader);
                }
            }
        }

        private static void appendDigitalSignature(XmlDocument xmlDocument, XmlNode xmlDigitalSignature)
        {
            xmlDocument.DocumentElement.AppendChild(xmlDocument.ImportNode(xmlDigitalSignature, true));
        }

        private static XmlDocument createXmlDocument(License licenseData)
        {
            var serializer = new XmlSerializer(licenseData.GetType());
            var sb = new StringBuilder();
            using (var writer = new StringWriter(sb))
            {
                var ns = new XmlSerializerNamespaces(); ns.Add("", "");
                serializer.Serialize(writer, licenseData, ns);
                var doc = new XmlDocument();
                doc.LoadXml(sb.ToString());
                return doc;
            }
        }

        private static XmlElement getXmlDigitalSignature(XmlDocument xmlDocument, AsymmetricAlgorithm key)
        {
            var xml = new SignedXml(xmlDocument) { SigningKey = key };
            var reference = new Reference { Uri = "" };
            reference.AddTransform(new XmlDsigEnvelopedSignatureTransform());
            xml.AddReference(reference);
            xml.ComputeSignature();
            return xml.GetXml();
        }

        private static string xmlDocumentToString(XmlDocument xmlDocument)
        {
            using (var ms = new MemoryStream())
            {
                var settings = new XmlWriterSettings { Indent = true, Encoding = Encoding.UTF8 };
                var xmlWriter = XmlWriter.Create(ms, settings);
                xmlDocument.Save(xmlWriter);
                ms.Position = 0;
                return new StreamReader(ms).ReadToEnd();
            }
        }
    }
}

using System;
using System.IO;

namespace SignedXmlSample
{
    class Program
    {
        static void Main(string[] args)
        {
            //Console.WriteLine(LicenseGenerator.CreateRSAKeyPair());
            writeLicense();            
            readLicense();

            Console.WriteLine("Press a key...");
            Console.ReadKey();
        }

        private static void readLicense()
        {
            var xml = File.ReadAllText("License.xml");
            const string publicKey = @"<RSAKeyValue>
                                    <Modulus>
                                        mBNKFIc/LkMfaXvLlB/+6EujPkx3vBOvLu8jdESDSQLisT8K96RaDMD1ORmdw2XNdMw/6ZBuJjLhoY13qCU9t7biuL3SIxr858oJ1RLM4PKhA/wVDcYnJXmAUuOyxP/vfvb798o6zAC1R2QWuzG+yJQR7bFmbKH0tXF/NOcSgbc=
                                    </Modulus>
                                    <Exponent>
                                        AQAB
                                    </Exponent>
                                 </RSAKeyValue>";

            var result = LicenseGenerator.ReadLicense(publicKey, xml);

            Console.WriteLine(result.Domain);
            Console.WriteLine(result.IssuedTo);
        }

        private static void writeLicense()
        {
            const string rsaData = @"<RSAKeyValue>
                    <Modulus>
                        mBNKFIc/LkMfaXvLlB/+6EujPkx3vBOvLu8jdESDSQLisT8K96RaDMD1ORmdw2XNdMw/6ZBuJjLhoY13qCU9t7biuL3SIxr858oJ1RLM4PKhA/wVDcYnJXmAUuOyxP/vfvb798o6zAC1R2QWuzG+yJQR7bFmbKH0tXF/NOcSgbc=
                    </Modulus>
                    <Exponent>
                        AQAB
                    </Exponent>
                    <P>
                        xwPKN77EcolMTD2O2Csv6k9Y4aen8UBVYjeQ4PtrNGz0Zx6I1MxLEFzRpiKC/Ney3xKg0Icwj0ebAQ04d5+HAQ==
                    </P>
                    <Q>
                        w568t0Xe6OBUfCyAuo7tTv4eLgczHntVLpjjcxdUksdVw7NJtlnOLApJVJ+U6/85Z7Ji+eVhuN91yn04pQkAtw==
                    </Q>
                    <DP>
                        svkEjRdA4WP5uoKNiHdmMshCvUQh8wKRBq/D2aAgq9fj/yxlj0FdrAxc+ZQFyk5MbPH6ry00jVWu3sY95s4PAQ==
                    </DP>
                    <DQ>
                        WcRsIUYk5oSbAGiDohiYeZlPTBvtr101V669IUFhhAGJL8cEWnOXksodoIGimzGBrD5GARrr3yRcL1GLPuCEvQ==
                    </DQ>
                    <InverseQ>
                        wIbuKBZSCioG6MHdT1jxlv6U1+Y3TX9sHED9PqGzWWpVGA+xFJmQUxoFf/SvHzwbBlXnG0DLqUvxEv+BkEid2w==
                    </InverseQ>
                    <D>                        Yk21yWdT1BfXqlw30NyN7qNWNuM/Uvh2eaRkCrhvFTckSucxs7st6qig2/RPIwwfr6yIc/bE/TRO3huQicTpC2W3aXsBI9822OOX4BdWCec2txXpSkbZW24moXu+OSHfAdYoOEN6ocR7tAGykIqENshRO7HvONJsOE5+1kF2GAE=
                    </D>
                  </RSAKeyValue>";

            string data = LicenseGenerator.CreateLicense(
                                                rsaData,
                                                new License
                                                {
                                                     Id = Guid.NewGuid(),
                                                     Domain = "dotnettips.info",
                                                     Expiration = DateTime.Now.AddYears(2),
                                                     IssuedTo = "VahidN",
                                                     Type = LicenseType.Standard
                                                });
            File.WriteAllText("License.xml", data);
        }
    }
}

public class SEO
{
    private const char TitleCharSeparator = '-';
    //-------------------------------------------------
    public static string GetTitle(params string[] crumbs)
    {
        var maxLenghtTitle = 60;

        var title = "";

        try
        {

            foreach (var crumb in crumbs)
            {
                title += string.Format(" {0} {1}", TitleCharSeparator, crumb);
            }
            title = title.Substring(3);
        }
        catch
        {

        }

        title = title.Substring(0, title.Length <= maxLenghtTitle ? title.Length : maxLenghtTitle).Trim(); 

        return title;
    }
    //-------------------------------------------------
    public static string GenerateMetaTag(this string pageTitle, string pageDescription)
    {
        var maxLenghtTitle = 60;
        var maxLenghtDescription = 170;

        pageTitle = pageTitle.Substring(0, pageTitle.Length <= maxLenghtTitle ? pageTitle.Length : maxLenghtTitle).Trim();
        pageDescription = pageDescription.Substring(0, pageDescription.Length <= maxLenghtDescription ? pageDescription.Length : maxLenghtDescription).Trim();


        var meta = "";

        try
        {
            meta += string.Format("<title>{0}</title>\n", pageTitle);
            meta += string.Format("<meta http-equiv=\"content-type\" content=\"text/html; charset=utf-8\"/>\n");
            meta += string.Format("<meta charset=\"utf-8\"/>\n");
            meta += string.Format("<meta name=\"description\" content=\"{0}\"/>\n", pageDescription);
            meta += string.Format("<meta name=\"robots\" content=\"{0}\" />\n", "follow");
            meta += string.Format("<link rel=\"shortcut icon\" href=\"{0}\"/>\n", "~/cdn/images/ui/favicon.ico");
        }
        catch
        {

        }

        return meta;
    }
    //-------------------------------------------------
    public static string GenerateSlug(this string title)
    {
        var maxLenghtSlug = 45;

        string str = title.RemoveAccent().ToLower();        



        str = Regex.Replace(str, @"[^a-z0-9-\u0600-\u06FF]", "-");
        str = Regex.Replace(str, @"\s+", "-").Trim();
        str = Regex.Replace(str, @"-+", "-");
        str = str.Substring(0, str.Length <= maxLenghtSlug ? str.Length : maxLenghtSlug).Trim();
 


        return str;
    }
    //-------------------------------------------------
    private static string RemoveAccent(this string txt)
    {
        var bytes = Encoding.GetEncoding("UTF-8").GetBytes(txt);
        return Encoding.UTF8.GetString(bytes);
    }
    //-------------------------------------------------
}

 let sum = 0;
let numbers = [1,2,3,4];

 // for loop
sum = 0;
for(let i =0; i < numbers.length; i++){
     sum += numbers[i];
}
//sum = 10

 // for in
sum = 0;
for(let i in numbers) {
    sum += numbers[i];
}
//sum = 10

 // iterator
sum = 0;

let iterator = number.values();
let next = iterator.next();
while(!next.done){
    sum += next.value;
    next = iterator.next();
}
//sum = 10

 var person = { first: "Vahid", last "N" };
for(let i in person) {
   console.log(person[i]);
}

 let numbers = [1,2,3,4];
for(let i of numbers) {
   console.log(i);
}

let sum = 0;
let numbers = [1,2,3,4];

for(let n of numbers){
   sum += n;
}

C:\Program Files\Microsoft SDKs\Windows\vXYZ\bin\MdbgCore.dll
C:\Program Files\Microsoft SDKs\Windows\vXYZ\bin\NETFX 4.0 Tools\MdbgCore.dll

using System;
using System.Collections;
using System.Diagnostics;
using Microsoft.Samples.Debugging.MdbgEngine;

namespace CpuAnalyzer
{
   class Program
   {
       static void Main(string[] args)
       {
           var engine = new MDbgEngine();

           var processesByName = Process.GetProcessesByName("MyApp");
           if (processesByName.Length == 0)
               throw new InvalidOperationException("specified process not found.");
           var processId = processesByName[0].Id;

           var process = engine.Attach(processId);
           process.Go().WaitOne();

           foreach (MDbgThread thread in (IEnumerable)process.Threads)
           {
               foreach (MDbgFrame frame in thread.Frames)
               {
                   if (frame == null || frame.Function == null) continue;
                   Console.WriteLine(frame.Function.FullName);
               }
           }

           process.Detach().WaitOne();
       }
   }
}

[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool GetThreadTimes(IntPtr handle, out long creation, out long exit, out long kernel, out long user);

for (int i = 0; i < 10; i++)
{
   foreach (MDbgThread thread in (IEnumerable)process.Threads)
   {
     //...
   }
   process.Go();
   Thread.Sleep(1000);
   process.AsyncStop().WaitOne();
}

• Managed Stack Explorer

• CLR Stack Explorer

• CPU-analyzer

class EventSource : System.Progress<int>
{
    public async System.Threading.Tasks.Task<int> PerformExpensiveCalculation()
    {
        var sum = 0;
        for (var i = 0; i < 100; i++)
        {
            await System.Threading.Tasks.Task.Delay(100);
            sum += i;
            this.OnReport(sum);
        }
        return sum;
    }
}

static class Program
{
    static void Main(string[] args)
    {
        var source = new EventSource();
        System.EventHandler<int> handler = (_, progress) => System.Console.WriteLine(progress);
        source.ProgressChanged += handler;
        System.Console.WriteLine(source.PerformExpensiveCalculation().Result);
        source.ProgressChanged -= handler;

        source.ProgressChanged += ProgressChangedMethod;
        System.Console.WriteLine(source.PerformExpensiveCalculation().Result);
        source.ProgressChanged -= ProgressChangedMethod;
    }

    private static void ProgressChangedMethod( object sender, int e )
    {
        System.Console.WriteLine(e);
    }
}

IL_0007:  ldsfld     class [mscorlib]System.EventHandler`1<int32> LambdaPerformance.Program/'<>c'::'<>9__0_0'
IL_000c:  dup
IL_000d:  brtrue.s   IL_0026
IL_000f:  pop
IL_0010:  ldsfld     class LambdaPerformance.Program/'<>c' LambdaPerformance.Program/'<>c'::'<>9'
IL_0015:  ldftn      instance void LambdaPerformance.Program/'<>c'::'<Main>b__0_0'(object, int32)
IL_001b:  newobj     instance void class [mscorlib]System.EventHandler`1<int32>::.ctor(object, native int)
IL_0020:  dup
IL_0021:  stsfld     class [mscorlib]System.EventHandler`1<int32> LambdaPerformance.Program/'<>c'::'<>9__0_0'
IL_0026:  stloc.1
IL_0027:  ldloc.0
IL_0028:  ldloc.1
IL_0029:  callvirt   instance void class [mscorlib]System.Progress`1<int32>::add_ProgressChanged(class [mscorlib]System.EventHandler`1<!0>)
IL_002e:  nop
IL_002f:  ldloc.0
IL_0030:  callvirt   instance class [mscorlib]System.Threading.Tasks.Task`1<int32> LambdaPerformance.EventSource::PerformExpensiveCalculation()
IL_0035:  callvirt   instance !0 class [mscorlib]System.Threading.Tasks.Task`1<int32>::get_Result()
IL_003a:  call       void [mscorlib]System.Console::WriteLine(int32)
IL_003f:  nop
IL_0040:  ldloc.0
IL_0041:  ldloc.1
IL_0042:  callvirt   instance void class [mscorlib]System.Progress`1<int32>::remove_ProgressChanged(class [mscorlib]System.EventHandler`1<!0>)

IL_004a:  ldftn      void LambdaPerformance.Program::ProgressChangedMethod(object, int32)
IL_0050:  newobj     instance void class [mscorlib]System.EventHandler`1<int32>::.ctor(object, native int)
IL_0055:  callvirt   instance void class [mscorlib]System.Progress`1<int32>::add_ProgressChanged(class [mscorlib]System.EventHandler`1<!0>)
IL_005a:  nop
IL_005b:  ldloc.0
IL_005c:  callvirt   instance class [mscorlib]System.Threading.Tasks.Task`1<int32> LambdaPerformance.EventSource::PerformExpensiveCalculation()
IL_0061:  callvirt   instance !0 class [mscorlib]System.Threading.Tasks.Task`1<int32>::get_Result()
IL_0066:  call       void [mscorlib]System.Console::WriteLine(int32)
IL_006b:  nop
IL_006c:  ldloc.0
IL_006d:  ldnull
IL_006e:  ldftn      void LambdaPerformance.Program::ProgressChangedMethod(object, int32)
IL_0074:  newobj     instance void class [mscorlib]System.EventHandler`1<int32>::.ctor(object, native int)
IL_0079:  callvirt   instance void class [mscorlib]System.Progress`1<int32>::remove_ProgressChanged(class [mscorlib]System.EventHandler`1<!0>)

static class Program
{
    static void Main(string[] args)
    {
        for (var repeats = 10; repeats <= 1000000; repeats *= 10)
        {
            VersionOne(repeats);
            VersionTwo(repeats);
        }
    }

    private static void VersionOne(int repeats)
    {
        var timer = new System.Diagnostics.Stopwatch();
        timer.Start();

        var source = new EventSource();
        for (var i = 0; i < repeats; i++)
        {
            System.EventHandler<int> handler = (_, progress) => System.Console.WriteLine(progress);
            source.ProgressChanged += handler;
            // Console.WriteLine(source.PerformExpensiveCalculation().Result);
            source.ProgressChanged -= handler;
        }

        timer.Stop();

        System.Console.WriteLine($"Version one: {repeats} add/remove takes {timer.ElapsedMilliseconds}ms");
    }

    private static void VersionTwo(int repeats)
    {
        var timer = new System.Diagnostics.Stopwatch();
        timer.Start();

        var source = new EventSource();
        for (var i = 0; i < repeats; i++)
        {
            source.ProgressChanged += ProgressChangedMethod;
            // Console.WriteLine(source.PerformExpensiveCalculation().Result);
            source.ProgressChanged -= ProgressChangedMethod;
        }

        timer.Stop();

        System.Console.WriteLine($"Version two: {repeats} add/remove takes {timer.ElapsedMilliseconds}ms");
    }

    private static void ProgressChangedMethod(object sender, int e)
    {
        System.Console.WriteLine(e);
    }
}

Version one: 10 add/remove takes 0ms
Version two: 10 add/remove takes 0ms
Version one: 100 add/remove takes 0ms
Version two: 100 add/remove takes 0ms
Version one: 1000 add/remove takes 0ms
Version two: 1000 add/remove takes 0ms
Version one: 10000 add/remove takes 0ms
Version two: 10000 add/remove takes 1ms
Version one: 100000 add/remove takes 8ms
Version two: 100000 add/remove takes 13ms
Version one: 1000000 add/remove takes 93ms
Version two: 1000000 add/remove takes 121ms

private static void VersionOne(int repeats)
{
    var timer = new System.Diagnostics.Stopwatch();
    timer.Start();

    var source = new EventSource();
    for (var i = 0; i < repeats; i++)
    {
        // System.EventHandler<int> handler = (_, progress) => System.Console.WriteLine(progress);
        source.ProgressChanged += (_, progress) => System.Console.WriteLine(progress);
        // Console.WriteLine(source.PerformExpensiveCalculation().Result);
        source.ProgressChanged -= (_, progress) => System.Console.WriteLine(progress);
    }

    timer.Stop();

    System.Console.WriteLine($"Version one: {repeats} add/remove takes {timer.ElapsedMilliseconds}ms");
}

Version one: 10 add/remove takes 0ms
Version two: 10 add/remove takes 0ms
Version one: 100 add/remove takes 1ms
Version two: 100 add/remove takes 0ms
Version one: 1000 add/remove takes 102ms
Version two: 1000 add/remove takes 0ms
Version one: 10000 add/remove takes 10509ms
Version two: 10000 add/remove takes 1ms
Version one: 100000 add/remove takes 1039014ms
Version two: 100000 add/remove takes 11ms

  IL_0018:  nop
  IL_0019:  ldloc.1
  IL_001a:  ldsfld     class [mscorlib]System.EventHandler`1<int32> LambdaPerformance.Program/'<>c'::'<>9__1_0'
  IL_001f:  dup
  IL_0020:  brtrue.s   IL_0039
  IL_0022:  pop
  IL_0023:  ldsfld     class LambdaPerformance.Program/'<>c' LambdaPerformance.Program/'<>c'::'<>9'
  IL_0028:  ldftn      instance void LambdaPerformance.Program/'<>c'::'<VersionOne>b__1_0'(object, int32)
  IL_002e:  newobj     instance void class [mscorlib]System.EventHandler`1<int32>::.ctor(object, native int)
  IL_0033:  dup
  IL_0034:  stsfld     class [mscorlib]System.EventHandler`1<int32> LambdaPerformance.Program/'<>c'::'<>9__1_0'
  IL_0039:  callvirt   instance void class [mscorlib]System.Progress`1<int32>::add_ProgressChanged(class [mscorlib]System.EventHandler`1<!0>)
  IL_003e:  nop
  IL_003f:  ldloc.1
  IL_0040:  ldsfld     class [mscorlib]System.EventHandler`1<int32> LambdaPerformance.Program/'<>c'::'<>9__1_1'
  IL_0045:  dup
  IL_0046:  brtrue.s   IL_005f
  IL_0048:  pop
  IL_0049:  ldsfld     class LambdaPerformance.Program/'<>c' LambdaPerformance.Program/'<>c'::'<>9'
  IL_004e:  ldftn      instance void LambdaPerformance.Program/'<>c'::'<VersionOne>b__1_1'(object, int32)
  IL_0054:  newobj     instance void class [mscorlib]System.EventHandler`1<int32>::.ctor(object, native int)
  IL_0059:  dup
  IL_005a:  stsfld     class [mscorlib]System.EventHandler`1<int32> LambdaPerformance.Program/'<>c'::'<>9__1_1'
  IL_005f:  callvirt   instance void class [mscorlib]System.Progress`1<int32>::remove_ProgressChanged(class [mscorlib]System.EventHandler`1<!0>)
  IL_0064:  nop
  IL_0065:  nop
  IL_0066:  ldloc.2
  IL_0067:  stloc.3
  IL_0068:  ldloc.3
  IL_0069:  ldc.i4.1
  IL_006a:  add
  IL_006b:  stloc.2
  IL_006c:  ldloc.2
  IL_006d:  ldarg.0
  IL_006e:  clt
  IL_0070:  stloc.s    V_4
  IL_0072:  ldloc.s    V_4
  IL_0074:  brtrue.s   IL_0018

var fileInfo = new FileInfo(outputFilePath);
long resumeOffset = 0;
if (fileInfo.Exists)
{
    resumeOffset = fileInfo.Length;
}
if (resumeOffset > 0)
{
    _client.DefaultRequestHeaders.Range = new RangeHeaderValue(resumeOffset, null);
}

var response = await client.GetAsync(url, HttpCompletionOption.ResponseHeadersRead);
if (response.Headers.AcceptRanges == null && resumeOffset > 0)
{
    // resume not supported, starting over
}

private readonly CancellationTokenSource _cts = new CancellationTokenSource();

var result = await client.GetAsync(url, HttpCompletionOption.ResponseHeadersRead, _cts.Token);
using(var stream = await result.Content.ReadAsStreamAsync())
{
   byte[] buffer = new byte[80000];
   int bytesRead;
   while((bytesRead = await stream.ReadAsync(buffer, 0, buffer.Length)) > 0 &&
         !_cts.IsCancellationRequested)
   {
      outputStream.Write(buffer, 0, bytesRead);
   }
}

public async Task DownloadFileAsync(string url, string outputFilePath, int maxRequestAutoRetries)
{
            var exceptions = new List<Exception>();

            do
            {
                --maxRequestAutoRetries;
                try
                {
                    await doDownloadFileAsync(url, outputFilePath);
                }
                catch (TaskCanceledException ex)
                {
                    exceptions.Add(ex);
                }
                catch (HttpRequestException ex)
                {
                    exceptions.Add(ex);
                }
                catch (Exception ex) when (isNetworkError(ex))
                {
                    exceptions.Add(ex);
                }

                // Wait a bit and try again later
               if (exceptions.Any())  await Task.Delay(2000, _cts.Token);
            } while (maxRequestAutoRetries > 0 &&
                     !_cts.IsCancellationRequested);

            var uniqueExceptions = exceptions.Distinct().ToList();
            if (uniqueExceptions.Any())
            {
                if (uniqueExceptions.Count() == 1)
                    throw uniqueExceptions.First();
                throw new AggregateException("Could not process the request.", uniqueExceptions);
            }
}

private static bool isNetworkError(Exception ex)
{
    if (ex is SocketException || ex is WebException)
        return true;
    if (ex.InnerException != null)
        return isNetworkError(ex.InnerException);
    return false;
}