DatagridView: How to delete selected cells

Question

There are number of questions on here about how to delete selected rows, but none about how to delete selected cells. That is, I would like for the user to be able to select cells from different rows and different columns, and be able to delete the contents. What I currenlty have is :

private void btnDelete_Click(object sender, EventArgs e)
    {
        foreach (DataGridViewCell cell in dataGridView1.SelectedCells)
        {
            int rowIndex = cell.RowIndex;
            int colIndex = cell.ColumnIndex;
            dataGridView1.Rows[rowIndex].Cells[colIndex].Value = 0;
        }
    }

So the user has to select the required cells and then push the delete button(here I assumed all my columns are of numeric type, so 0 works). But it doesn't leave the cells completely empty. Here is another attempt:

private void dataGridView1_KeyDown(object sender, KeyEventArgs e)
    {
          if (e.KeyCode == Keys.Delete && dataGridView1.CurrentCell.Selected)
        {
           dataGridView1.CurrentCell.Value = null;
           e.Handled = true;
        }
    }

Unfortunately this event gets caught by my dataGridView1_DataError event, where I have

bindingSource1.CancelEdit();

And so I can't assign null to cell contents.

Goal

I would like to emulate the row delete behaviour, where you can select a row, push the delete key and then all cell contents of that row are left blank . I would like to do this, instead of leaving zeros in the cells. How can I do that?

Answer 1

To hide the zeroes, try using the CellFormatting event:

void dgv_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e) {
  if (e.Value != null && e.Value.ToString() != "" && (int)e.Value == 0) {
    e.Value = string.Empty;
    e.FormattingApplied = true;
  }
}

Answer 2

Please use the following code:

private void dataGridView1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.Delete)
    {
        foreach (DataGridViewCell cell in dataGridView1.SelectedCells)
        {
            cell.Value = "";
        }
        e.Handled = true;
    }
}