Assume that you have a user control with ID “Login-Control” on a page. In that login control you might be having two text boxes (TB1, TB2) and two lables (LB1, LB2) and one button(BT1). If you want to get the clientID for TB1 at the page level you can’t use like <%= TB1.ClientID %> (It does not work). Here you should go for the following statement:
Login-Control.FindControl(“TB1″).ClientID
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