Use the GetCellDisplayText method to obtain a textual representation of the specified cell value. The returned string is formatted as specified by the GridColumn.DisplayFormat property of the column to which the specified cell belongs. If you need to obtain the actual cell value, use the DataGridView.GetCellValue method instead.
The GetCellDisplayText method returns an empty string in the following cases:
the specified row handle does not point to any of the rows within the grid or points to a group row;