paxScript.NET 

The component implements C# and VB.NET interpreter written in C# which is possible to to embed into your WinForms or ASP.NET application so you can customize and extend the application without having to recompile it.
c# asp.net interpreter script delphi component shareware

Xceed Grid for .NET 

An advanced and extensible .NET grid control. Unites the power of bound and unbound grids with superior flexibility, reliability and display speed. The only grid that's 100% extensible, offers true WYSIWYG and uses any .NET control as a cell editor.
component grid control .net