Datagridview forcing only one checkbox to be selected in a column

Question

How do I force only a single checkbox to be checked in a column of a Datagridview?

Solution 1

You will have to subscribe for the CellValueChanged event of the grid and depending on the check state of the current cell, loop the DataGridView and set true/false as Value for the other cells.

void grd_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
      if ((sender as DataGridView).CurrentCell is DataGridViewCheckBoxCell)
      {
           if (Convert.ToBoolean(((sender as DataGridView).CurrentCell as DataGridViewCheckBoxCell).Value))
           {
                   // Maybe have a method which does the
                    //loop and set value except for the current cell
            }
        }
}

Solution 2

 private void grdRegClass_CellContentClick(object sender, DataGridViewCellEventArgs e)
    {
        if (grdRegClass.Columns.IndexOf(grdRegClass.Columns["Status"]) == e.ColumnIndex)
        {
            int currentcolumnclicked = e.ColumnIndex;
            int currentrowclicked = e.RowIndex;
            foreach (DataGridViewRow dr in grdRegClass.Rows)
            {
                dr.Cells[currentcolumnclicked].Value = false;
            }
            grdRegClass.CurrentRow.Cells[currentrowclicked].Value = true;  
        }
    }

Solution 3

    private void dataGridViewProduit_CellValueChanged(object sender, DataGridViewCellEventArgs e)
    {
        if ((sender as DataGridView).CurrentCell is DataGridViewCheckBoxCell)
        {
            if (Convert.ToBoolean(((sender as DataGridView).CurrentCell as DataGridViewCheckBoxCell).Value))
            {
                foreach (DataGridViewRow row in (sender as DataGridView).Rows)
                {
                    if (row.Index != (sender as DataGridView).CurrentCell.RowIndex && Convert.ToBoolean(row.Cells[e.ColumnIndex].Value) == true)
                    {
                        row.Cells[e.ColumnIndex].Value = false;
                    }
                }
            }
        }
    }

    private void dataGridViewClient_CurrentCellDirtyStateChanged(object sender, EventArgs e)
    {
        if (this.dataGridViewClient.IsCurrentCellDirty)
        {
            dataGridViewClient.CommitEdit(DataGridViewDataErrorContexts.Commit);
        }
    }