From which website can i get the complete source code for all the asp.net(C#.net) controls & applications?

i am developing one project so i need codes for datagrid,datepicker,Filters using operators,etc.so i need to know from which website we can get all type of our codes for any type of tools we use in dotnet?From which website can i get the complete source code for all the asp.net(C#.net) controls %26amp; applications?
You can't get the source code, that's proprietary code written by Microsoft.