public class Product
{
      public virtual int Id { set; get; }

      [Length(120)]
      [NotNullNotEmpty]
      public virtual string Name { get; set; }
    
      public virtual decimal UnitPrice { get; set; }
}

public class ProductCustomMappings : IAutoMappingOverride<Product>
{
   public void Override(AutoMapping<Product> mapping)
   {
      mapping.Id(u => u.Id).GeneratedBy.Identity(); //ضروری است
      mapping.Map(p => p.Name).Unique();
   }     
}

.Add(Expression.Eq("Name", "Smith"))

.Where<Person>(p => p.Name == "Smith")

IList<Cat> cats = session.QueryOver<Cat>().Where(c => c.Name == "Max").List();

public static int Fibonacci(int x)
{
    if (x <= 1)
          return 1;
    return Fibonacci(x - 1) + Fibonacci(x - 2);
}

using System;
using System.Collections.Generic;
using System.Numerics; //needs a ref. to this assembly

namespace Fibonaci
{
   public class CFibonacci
   {
       public static int Fibonacci(int x)
       {
           if (x <= 1)
               return 1;
           return Fibonacci(x - 1) + Fibonacci(x - 2);
       }

       public static IEnumerable<BigInteger> BigFib(Int64 toNumber)
       {
           BigInteger previous = 0;
           BigInteger current = 1;

           for (Int64 y = 1; y <= toNumber; y++)
           {
               var auxiliar = current;
               current += previous;
               previous = auxiliar;
               yield return current;
           }
       }
   }
}

using System;
using System.Linq;

namespace Fibonaci
{
   class Program
   {
       static void Main()
       {
           foreach (var i in CFibonacci.BigFib(10))
           {
               Console.WriteLine("{0}", i);
           }

           var num = 12000;
           var fib = CFibonacci.BigFib(num).Last();
           Console.WriteLine("fib({0})={1}", num, fib);

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

fib(12000)=514263424911336592579396579289954520826834443526829600435873863248622
65414020714013892551476261070010099275571144059579167356039437242089427136323689
02207956221569622791450891447905907668251232675988098246382902426783148546665404
47372384043164600945249911273857878346679362876357499204290285069442042444471200
52292329349103672302428662317285015525888210397583707071480178840772972692357054
71823998861896761687119434646250991702691100894769561810834542099577336821493905
41651658937860506067011215222435859797671748514023462634575877112541265857011723
31453990415231608729534781720381122965899871018532003735284559342372552627132300
63895825396012087948050855095233633638445668687440232926253620457459973889510838
23542785159371236389909470974738599166720611351903568781845409425624666559791912
02212289710838873334773835118391287956725504426150461421914844191810523257658770
99885492757927034409234340065928400769741802132203888929463702342324148343605275
28928280472094493359682662519127203581813404104542972181231076224891404730611459
03321942693225066038987483163709402601230467054944349111055850348779989058517069
96087626795709205215727843443054577680024507650678240240742421270422674907476927
22422733945450760323640619100021663675080870429299040891840880753646474330069332
72320218334582268219906763463261387161318500503970491314781100556494361063341371
43577787961183154125538371204296752028496084633103476783071177779604042581017888
28257784920659671082363171157289668904381254080676855815524987553372657063695970
39668109161449140707240711279859427919912443872405284305891366802954763421905970
15206311458187449420118838775707435857999310870199585760807680179258273461000460
97527064929564528474349547038178370043823628944670926601955537657427194815893365
88494863101667547896798728140224921584809355334379707156342620570496834086358692
30946467203330676206265047960072392991634456381998479411463182171816379650120684
35082399788137090460167819041845511951296934273988759169877839532492294430334328
46972905198131530224288922834125154211248159843609629469051889033085360540770480
25633451201705370447586177546577777759300410144166197439355903631773088812515215
09638377918595294747887970034209028019490210394392422302403687059119407005858379
52137098994457236290005745735420803758853723206992134642997705010940581386168427
47382973672816710014652632509888958851675894223117421829434728942878605569971512
65291783384910157203679779458354245579846973830472593370160977523707902575129803
072039857524154149354311250529579592001

[TestMethod]
public void TestRandomWithEnumerable()
{
    var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    var random = new Random();
    var result = new string(
        Enumerable.Repeat(chars, 6)
        .Select(s => s[random.Next(s.Length)])
        .ToArray());
    Assert.IsTrue(result.Length == 6);
}

var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuwxyz~!@#$%^&*";

Guid.NewGuid().ToString().Replace("-", string.Empty).Substring(0, 6);

Guid.NewGuid().ToString("n").Substring(0, 6);

public static string GetUniqueKey(int maxSize)
        {
            char[] chars = new char[62];
            chars =
            "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890".ToCharArray();
            byte[] data = new byte[1];
            using (RNGCryptoServiceProvider crypto = new RNGCryptoServiceProvider())
            {
                crypto.GetNonZeroBytes(data);
                data = new byte[maxSize];
                crypto.GetNonZeroBytes(data);
            }
            StringBuilder result = new StringBuilder(maxSize);
            foreach (byte b in data)
            {
                result.Append(chars[b % (chars.Length)]);
            }
            return result.ToString();
        }
    }

public string Get8CharacterRandomString()
{
    string path = Path.GetRandomFileName();
    path = path.Replace(".", ""); // Remove period.
    return path.Substring(0, 6);  // Return 6 character string
}

var chars = "abcdefghijklmnopqrstuvwxyz123456789".ToArray();
string pw = Enumerable.Range(0, passwordLength)
                      .Aggregate(
                          new StringBuilder(),
                          (sb, n) => sb.Append((chars[random.Next(chars.Length)])),
                          sb => sb.ToString());

 UserDialogs.Init(this); // Before Forms.Init

containerBuilder.RegisterInstance(UserDialogs.Instance);

public IUserDialogs UserDialogs { get; set; }

public async Task Login()
{
      if (string.IsNullOrWhiteSpace(UserName) || string.IsNullOrWhiteSpace(Password))
           await UserDialogs.AlertAsync(message: "Please provide UserName and Password!", title: ")-:", okText: "Ok!");
}

using (UserDialogs.Loading("Logging in...", maskType: MaskType.Black))
{
     // Login implementation ...
     await Task.Delay(TimeSpan.FromSeconds(3));
}

await NavigationService.NavigateAsync("/Login", animated: false);

await NavigationService.NavigateAsync("/Nav/HelloWorld");

await NavigationService.NavigateAsync("ProductDetail", new NavigationParameters
{
      { "productId", productId }
});

public async override Task OnNavigatedToAsync(INavigationParameters parameters)
{
      await base.OnNavigatedToAsync(parameters);
      Guid productId = parameters.GetValue<Guid>("productId");
}