How can I add DataGridViewComboBoxCell

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C#

Windows

how Can I add combo box cell for all row when I set dataset to data grid view ;
...I wrote this code but it does n't work:datagridview.DataSource = ds;
datagridview.DataMember = "selectE";
DataGridViewComboBoxCell cell = new DataGridViewComboBoxCell();
for (int i = 0; i < ds.Tables["Post"].Rows.Count; i++)
{
cell.Items.Add(ds.Tables["Post"].Rows[i][0].ToString());
}
for (int j = 0; j < ds.Tables["selectE"].Rows.Count; j++)
{ datagrid_Name181[0,j] = cell;
}