Datagridview : disable the default value of a comboboxcolumn

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C#

Hi,

I have a datagridview with three columns : the first column is an editText box , the second and the third column are a comboboxcolumn of enum.

when i run the code, by default the first row is displayed with all fields are empty.
but the problem come when i click to the first cell (TextBox), the two other combobox cell take automatically their default values. but i don't want them to take any value unless i select it by myself.



is there any way to do it ?

for info the datasource of the datagridview is linked to a list.

thanks,

What I have tried:

private void dgv_TableTarification_CellClick(object sender, DataGridViewCellEventArgs e)
   {
     if (e.RowIndex < 0) //le click sur la cellule else le header n'entraine pas une exception
       return;
     if (e.ColumnIndex < 0)
       return;
     //if (e.ColumnIndex != 1)
     //  return;
     if (this.dgv_TableTarification.CurrentCell.ColumnIndex == 0)
     {
       this.dgv_TableTarification.Rows[e.ColumnIndex].Cells["C_Tarif"].Selected = false;
       this.dgv_TableTarification.Rows[e.ColumnIndex].Cells["C_RELAIS"].Selected = false;
     }
   }

private void dgv_TableTarification_DefaultValuesNeeded(object sender, DataGridViewRowEventArgs e)
   {
     e.Row.Cells["C_Tarif"].Value = string.Empty;
     e.Row.Cells["C_RELAIS"].Value = string.Empty;
   }