The most important URL for a .NET developer

Get source implementation code for the entire .NET Framework! See how the experts code at Microsoft. 

Below URL is base code for Array implementation in .NET Framework.

https://referencesource.microsoft.com/#mscorlib/system/array.cs,42e9b7616956cf94

and looks like

I wrote this post because I keep on forgetting about this resource. You can download all documentation starting from Framework 4.5.1.