If you want to access client controls, you will use Request.Form[""].
You have an aspx page which contains some server side & client side side controls.
If you want to access server controls in .cs page, you can access by its id. but you won't in case of client controls.
So if you alse want to access this, you have to use Request.Form[""].in .aspx page
<asp:TextBox ID="txtServerControl" runat="server" Text=""/> now in .cs page:
<input type="text" name="txtClientControl" id="txtClientControl" value=""/>
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