Set Focus of Controls in ASP.NET

Refer Below Code to Set the Focus of a Control in asp.net
you need to call this method where you want to set focus of control.

  Private Sub SetFocus(ByVal FocusControl As Control)
        Dim Script As New System.Text.StringBuilder
        Dim ClientID As String = FocusControl.ClientID
        With Script
            .Append("<script language='javascript'>")
            .Append("document.getElementById('")
            .Append(ClientID)
            .Append("').focus();")
            .Append("</script>")
        End With
        RegisterStartupScript("setFocus", Script.ToString())
    End Sub

Regards
Santosh