multithreading - C# Thread to open OpenFileDialog is woking in VS 2005 development But not in IIS 6 -


below code used initial method 

protected void gvexperience_rowcommand(object sender, gridviewcommandeventargs e) {             switch (e.commandname)      {          case ("singleclick"):              system.security.principal.windowsidentity identity = system.security.principal.windowsidentity.getcurrent();                              gridviewrow gvr = (gridviewrow)((ctlbutton)e.commandsource).namingcontainer;              int rowindex = gvr.rowindex;               filethread = new thread(delegate() { openfile(rowindex, identity); });              filethread.apartmentstate = apartmentstate.sta;              filethread.start();              filethread.join();           break;      } }

second method called initial method

public void openfile(object row, object stateinfo) {      system.security.principal.windowsidentity identity = stateinfo windowsidentity;             identity.impersonate();     openfiledialog openfiledialog1 = new openfiledialog();     dialogresult result = openfiledialog1.showdialog();     int rowval = int.parse ( row.tostring());     if (result == dialogresult.ok) // test result.     {         ctllabel lbledit = (ctllabel)gvexperience.rows[rowval].cells[9].findcontrol("edttxtdocument");                    lbledit.text = openfiledialog1.filename;                    filethread.abort();     } }


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