I have change the QTableWidget into QTableWidgetItem.
In my Dialog it display nothing in LineEdits.
Qt Code: 
  1. void ContactWindow::edit(QTableWidgetItem* )
  2. {
  3. 	int row;
  4. 	contactTable->selectRow(row);
  5.  
  6.         QTableWidgetItem *item = contactTable->item( row, 0 );
  7.         QString bedrijf;
  8.         if( item != 0 ) {
  9.           bedrijf = item->text();
  10.         }
  11. 	QTableWidgetItem *contactitem = contactTable->item( row, 1 );
  12.         QString contact;
  13.         if( contactitem != 0 ) {
  14.           contact = contactitem->text();
  15.         }
  16. 	QTableWidgetItem *telitem = contactTable->item( row, 2 );
  17.         QString tel;
  18.         if( telitem != 0 ) {
  19.           tel = telitem->text();
  20.         }
  21.  
  22. 	{
  23. 	contactDialog dlg(this);
  24. 	dlg.leBedrijf->setText( bedrijf);
  25.         dlg.leContact->setText( contact ); 
  26. 	dlg.leTel->setText( tel );
  27. 	if(dlg.exec() == QDialog::Accepted) {
  28. 		}
  29.  
  30.    	}
  31. }
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