private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
ComboBox c = e.Control as ComboBox;
if (c != null) c.DropDownStyle = ComboBoxStyle.DropDown;
}
private void dataGridView1_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
{
DataGridView dgvForm = (DataGridView)sender;
DataGridViewComboBoxCell cell = dgvForm.CurrentCell as DataGridViewComboBoxCell;
if (cell != null && !cell.Items.Contains(e.FormattedValue))
{
cell.Items.Insert(0, e.FormattedValue);
if (dgvForm.IsCurrentCellDirty)
{
dgvForm.CommitEdit(DataGridViewDataErrorContexts.Commit);
}
cell.Value = cell.Items[0];
}
}