This is how a register the control on the page:
<%@ Register TagPrefix="uc" TagName="Pcp" Src="../../Controls/ClientPayement.ascx" %>
And this is how I use it:
<uc1:Pcp ID = "pcpClient1"></uc1:Pcp>
I don't know why uc1 has a green underline warning. When I hover over it, it says: "Unrecognized namespace uc1". And the user control is not displaying on the page.
Am I missing something? Yet this tutorial says that this is all I need to do.