asp.net2003textBox获得焦点

GiveFocus(this.TextBox1);
public void GiveFocus(Control c) 
        { 
        RegisterClientScriptBlock("CSP-focus-function", "<script language=\"JavaScript\"> function CSP_focus(id) { var o = document.getElementById(id); if (o != null) o.focus(); }</script>"); 
            RegisterStartupScript("CSP-focus", "<script language=\"JavaScript\">CSP_focus('" + c.ClientID + "');</script>"); 
        }