Answer / om shivaya namaha

user control purpose is when ever a group of controls that
used in most of the pages then we can define those controls
as a user control

user.ascx page :-2 textboxes it is containing

textbox1
textbox2

default.aspx:- thes aspx page is going to use the user control

in design default.aspx:-
<@register tagname="User" tageprefix="US" src="user.ascx">
<table>
<tr>
<td><US:User id="Usercont" runat="server" ></td>
</tr></table>

in serverside default page:-

textbox tx=new textbox();
tx= (textbox)Usercont.findcontrol("textbox1");

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