What are digital signatures and what do they tell us, what information do they hold? All this and more are explained in this article. 

One of the functionalities I had to use fairly often on different ASP.NET Web API projects that I was involved in in the past was IP filtering – restricting access to the whole API, or to parts of it, based on the caller’s IP address. 

With the release of Visual Studio 2015 came the (final) release of the Roslyn C# compiler and C# 6. This latest version of C#’s feature list seems to be…less than exciting, but it’s important to keep in mind that before Roslyn, none of these new features would have ever made it into a release. It was simply too hard to add a feature in C#, so higher impact/value features made it in while minor annoyances/enhancements would be deferred, indefinitely 

You already know how role-based authorization works in ASP.NET Core but what if you don't want hardcode roles in authorization attribute or create roles later and specify in which controller and action it has access without touching source code? 

Would you like help creating single-page applications (SPAs)? Maybe you've worked with tools like jQuery and AJAX, but what about Ember? With a simple syntax and an emphasis on reuse and components, this JavaScript framework can make it very easy to create interactive pages. Get a close look at Ember, plus lots of demos and practical tips with popular experts Adam Tuliper and Christopher Harrison, in this three-hour event for the MVA community 

 <#@ template debug="false" hostspecific="false" language="C#" #>
//
// This code was generated by a tool. Any changes made manually will be lost
// the next time this code is regenerated.
//
using System.Reflection;
using System.Resources;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

[assembly: AssemblyCompany("some name")]
[assembly: AssemblyCulture("")]
[assembly: NeutralResourcesLanguageAttribute("en")]

[assembly: AssemblyProduct("product name")]
[assembly: AssemblyCopyright("Copyright VahidN 2014")]
[assembly: AssemblyTrademark("some name")]

#if DEBUG
[assembly: AssemblyConfiguration("Debug")]
#else
[assembly: AssemblyConfiguration("Release")]
#endif

// Assembly Versions are incremented manually when branching the code for a release.
[assembly: AssemblyVersion("<#= this.MajorVersion #>.<#= this.MinorVersion #>.<#= this.BuildNumber #>.<#= this.RevisionNumber #>")]
// Assembly File Version should be incremented automatically as part of the build process.
[assembly: AssemblyFileVersion("<#= this.MajorVersion #>.<#= this.MinorVersion #>.<#= this.BuildNumber #>.<#= this.RevisionNumber #>")]

<#+
// Manually incremented for major releases, such as adding many new features to the solution or introducing breaking changes.
int MajorVersion = 1;
// Manually incremented for minor releases, such as introducing small changes to existing features or adding new features.
int MinorVersion = 0;
// Typically incremented automatically as part of every build performed on the Build Server.
int BuildNumber = (int)(DateTime.UtcNow - new DateTime(2013,1,1)).TotalDays;
// Incremented for QFEs (a.k.a. “hotfixes” or patches) to builds released into the Production environment.
// This is set to zero for the initial release of any major/minor version of the solution.
int RevisionNumber = 0;
#>

 using System.Reflection;
using System.Runtime.InteropServices;

[assembly: AssemblyTitle("title")]
[assembly: AssemblyDescription("")]
[assembly: ComVisible(false)]
[assembly: Guid("9cde6054-dd73-42d5-a859-7d4b6dc9b596")]

public class DebuggerBrowsableTest
{
    [DebuggerBrowsable(DebuggerBrowsableState.Never)] // عدم نمایش در زمان دیباگ در پنجره متغیرها
    public string FirstName { get; set; }

    [DebuggerBrowsable(DebuggerBrowsableState.Collapsed)] // مقدار پیش فرض
    public string LastName { get; set; }

    [DebuggerBrowsable( DebuggerBrowsableState.RootHidden )] // عدم نمایش در زمان دیباگ در پنجره متغیرها
    public string FullName => FirstName + " " + LastName;

    [DebuggerBrowsable( DebuggerBrowsableState.RootHidden )] // تنها در زمانی که یک آرایه یا لیست باشد نمایش داده می‌شود
    public string[] FullNameArray => new string[] { FirstName + " " + LastName };
}

Operator ??

عملگر ??  در صورتی که عملوند سمت چپ آن تهی (null) نباشد، مقدار آن را باز می‌گرداند و در غیر اینصورت مقدار عملوند سمت راست خود را باز می‌گرداند. نوع‌های تهی پذیر (nullable) می‌توانند دارای مقدار و یا به صورت تعریف نشده باشند. عملگر ?? وقتی که یک نوع تهی پذیر به یک نوع غیرتهی پذیر انتساب داده می‌شود، مقدار پیش فرض آن را باز می‌گرداند.

int? x = null;
int y = x ?? -1;
Console.WriteLine("y now equals -1 because x was null => {0}", y);
int i = DefaultValueOperatorTest.GetNullableInt() ?? default(int);
Console.WriteLine("i equals now 0 because GetNullableInt() returned null => {0}", i);
string s = DefaultValueOperatorTest.GetStringValue();
Console.WriteLine("Returns 'Unspecified' because s is null => {0}", s ?? "Unspecified");

It has only been about a year since .NET Core 1.0 RC came out. We are now getting close to .NET Core 2.0. We have been playing with .NET Core since the betas and feel like the quality of the 1.0 runtime was very good. Our only complaint has really been odd Visual Studio behavior. We would expect that with 2.0, the adoption of .NET Core is likely to skyrocket. 

A lot of time this keyword was a mystery for me and many starting JavaScript developers. It is a
powerful feature, but requires efforts to be understood

A new free extension for Visual Studio was released that enables developers to create cross-platform HTML5 applications exclusively using C# and XAML.