Start a new project by building a new Class Library

Resources
Add a new folder to the WITControlLibrary and name it Resources. Add the images needed for the control. In this example the images of the delete, edit, up and down button are added. The images are added to your project, but will not be a part of your control’s DLL. To embed the images into the DLL, select each image and change its property ‘Build Action’ to ‘Embedded Resource’.

AssemblyInfo.cs
The images will be embedded in the DLL when you build the project. But to be able to refer to the resources in the DLL-file from code-behind, you will need to add the resource to the AssemblyInfo.cs (Properties-directory). In case of the grid control, these rows will be added to the AssemblyInfo.cs:

The WebResource contains the path to the resource, but use dots instead of slashes.

References
For the custom grid control, we need the following references:

System
Sytem.Data
System.Design
System.Web
System.Web.Extensions
System.Web.Extensions.Design