User control open again and again on page load

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C#

ASP.NET

C#4.0

AoA
Dear
i am using user control in my form. when user click on search button open the usercontrol to search record, after searching load grid when grid load, on grid row click load record to dispatch form. and close the user control.
But problem is here when user open user control and they want to close user control the go to cross button and close. still window close but when page load it open again. please give me any solution.
thanks.
here i close the usercontrol. but it work when user select any record

private void Search()
        {
           try
           {
               this.rwSearchDispatchForm.VisibleOnPageLoad = true;
           }
           catch (Exception ex)
           {
               this.lblMessage.Text = "<font color=red> " + ex.Message + "</font>";
           }
       }