how to allow user manual entry in datagridview combobox in c# -

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i trying enter values in datagridview combobox. not allows. do?

private void gridstockitementry_editingcontrolshowing(object sender, datagridvieweditingcontrolshowingeventargs e)     {          datagridviewrow row = gridstockitementry.currentrow;         datagridviewcell cell = gridstockitementry.currentcell;         if (e.control.gettype() == typeof(datagridviewcomboboxeditingcontrol))         {              if (cell == row.cells["itemname"] && convert.tostring(row.cells["type"].value) == "raw material")             {                 datagridviewcomboboxeditingcontrol cbo = e.control datagridviewcomboboxeditingcontrol;                  cbo.dropdownstyle = comboboxstyle.dropdown;                  cbo.validating += new canceleventhandler(cbo_validating);             }         }       }     void cbo_validating(object sender, canceleventargs e)     {          datagridviewcomboboxeditingcontrol cbo = sender datagridviewcomboboxeditingcontrol;          datagridview grid = cbo.editingcontroldatagridview;          object value = cbo.text;          // add value list if not there          if (cbo.items.indexof(value) == -1)         {              datagridviewcomboboxcell cbocol = (datagridviewcomboboxcell)grid.currentcell;              // must add both current combobox template, avoid duplicate entries...              cbo.items.add(value);              cbocol.items.add(value);              grid.currentcell.value = value;          }      }

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