DataGridViewComboBoxCell valueValue is invalid with binded DataGridViewComboBoxCell

Question

I have a DatagridView with two DataGridViewComboBoxCell:

1. Administration
2. Employee.

What I want to do is when I select an administration from

Answer 1

Try to clear the value of employee cell before rebind it in the void

"selectEmployee", something like:

private void selectEmployee(int idAdministration)
{
    if (con.State != ConnectionState.Open)
    {
        con.Open();
    }
    SqlCommand Cmd = new SqlCommand("SELECT * FROM Employee WHERE IdAdministration = @idAdministration", con);
    Cmd.Parameters.AddWithValue("@idAdministration", idAdministration);
    DataTable Dt = new DataTable();
    Dt.Load(Cmd.ExecuteReader());
    DataGridViewComboBoxCell cb = (DataGridViewComboBoxCell)dataGridView1.CurrentRow.Cells["Employee"];
    cb.Value = null; //add this
    cb.DataSource = Dt;
    cb.DisplayMember = "Name";
    cb.ValueMember = "CodeEmployee";
    con.Close();
}