error in storing text value in string in c#

[#1]

I have written a program to get Text field from a qlik view chart from an application and copy it to word document. Suppose the text field has name Alex. It copies the word successfully Alex to word. Now i want to save Alex(Text field in string) How to do that?

case 6: //text
   QVObject.GetSheet().Activate();
   ReportControl.QVApp.WaitForIdle();

   if (objectName == "TX01")
   {
   Console.WriteLine("I have found my fullname again");
   // copy text field in global object tamp_val ----> error here
  tamp_val = QVObject.CopyTextToClipboard();
   Console.WriteLine(" this is my object type" + tamp_val);
   // QVObject.CopyTextToClipboard();
   }

   QVObject.CopyTextToClipboard();
   Console.WriteLine("Found TX item: {0}", objectName);
   //pasteToWord(item);

   break;