How to edit item in combox from datagrid view (double click

Refer the following Links : http://www.dreamincode.net/forums/topic/32351-obtaining-field-value-from-datagrid-on-double-click/

https://social.msdn.microsoft.com/Forums/windows/en-US/8872c419-54d1-4fc7-9a6c-6384358e0bb7/how-to-allow-edit-in-datagridview-comboboxcolumn-in-c?forum=winforms

Something like this may Help :-

private void DataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
if (DataGridView1.CurrentCell.ColumnIndex == yourComboBoxColum)
{
ComboBox combo = e.Control as ComboBox;
if (combo == null)
return;
combo.DropDownStyle = ComboBoxStyle.DropDown;
}
}