c# - sometimes I want to hide buttons in a DataGridViewButtonColumn

Question

I have a DataGridView which was the subject of a previous question (link). But sometimes the Button is null. This is fine. But if it is null, is there any way I can optionally remove/add (show/hide?) buttons to the DataGridViewButtonColumn of Buttons

like this:

+------------+------------+
| MyText     | MyButton   |
+------------+------------+
| "do this"  | (Yes)      |
| "do that"  | (Yes)      |
| FYI 'blah' |            | <---- this is where I optionally want no button
| "do other" | (Yes)      |
+------------+------------+

this is what I have tried so far (based on this example)

private void grdVerdict_CellFormat(object sender, DataGridViewCellFormattingEventArgs e)
{
   if (e.ColumnIndex == grdChoice.Columns["yesbutton"].Index)
   {
       if (grdVerdict[e.ColumnIndex, e.RowIndex].Value == null)
       {
            //grdVerdict[e.ColumnIndex, e.RowIndex].Visible = false; //<-says 'it is read only'
            //grdVerdict[e.ColumnIndex, e.RowIndex].Value = new DataGridTextBox(); //<- draws 'mad red cross' over whole grid
            //((Button)grdVerdict[e.ColumnIndex, e.RowIndex]).Hide; //<- won't work
       }
       else
       {
          e.Value = ((Button)grdChoice[e.ColumnIndex, e.RowIndex].Value).Text;
       }
   }
}

Answer 1

I had the same "problem" today. I also wanted to hide buttons of certain rows. After playing around with it for a while, I discovered a very simple and nice solution, that doesn't require any overloaded paint()-functions or similar stuff:

Just assign a different DataGridViewCellStyle to those cells.
The key is, that you set the padding property of this new style to a value that shifts the whole button out of the visible area of the cell.
That's it! :-)

Sample:

System::Windows::Forms::DataGridViewCellStyle^  dataGridViewCellStyle2 = (gcnew System::Windows::Forms::DataGridViewCellStyle());
dataGridViewCellStyle2->Padding = System::Windows::Forms::Padding(25, 0, 0, 0);

dgv1->Rows[0]->Cells[0]->Style = dataGridViewCellStyle2;
// The width of column 0 is 22.
// Instead of fixed 25, you could use `columnwidth + 1` also.