We can implement a Web User Control in form using 2 steps.
Step 1 : Add a "<%@ Register %>" tag in your aspx page.
<%@ Register TagPrefix="UC" TagName="UserControl" src="~/WebUserControl.ascx" %>
Step 2 : Write the following code on Body part .
At the time of execution it'll include the page deatils as well as Web User Control Codes also.