ref:
https://blogs.msdn.com/b/davidebb/archive/2005/10/31/turning-an-ascx-user-control-into-a-redistributable-custom-control.aspx https://blogs.msdn.com/b/davidebb/
https://blogs.msdn.com/b/davidebb/archive/2005/10/31/turning-an-ascx-user-control-into-a-redistributable-custom-control.aspx https://blogs.msdn.com/b/davidebb/