How to Filter List in ComboBoxColumn in DataGridView

Hi !
I have completed 90%.Only 1 things left is that text that I type it compare from left only.But I required from any location of the word in the list.

Solutions is for DataGridViewComboBoxColumn:
private void gvAdd_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
if (gvAdd.CurrentCell.ColumnIndex == gvAdd.Columns[0].Index)
{
cmbI = e.Control as ComboBox;
cmbI.SelectedIndexChanged -= new EventHandler(ddlItems_SelectedIndexChanged);
cmbI.SelectedIndexChanged += new EventHandler(ddlItems_SelectedIndexChanged);

((ComboBox)e.Control).DropDownStyle = ComboBoxStyle.DropDown;
((ComboBox)e.Control).AutoCompleteSource = AutoCompleteSource.ListItems;
((ComboBox)e.Control).AutoCompleteMode = System.Windows.Forms.AutoCompleteMode.SuggestAppend;

}
}
and for Combobox :
AutoCompleteStringCollection col = new AutoCompleteStringCollection();
int i = 0;
for (i = 0; i <= ds.Tables[0].Rows.Count - 1; i++)
{
col.Add(ds.Tables[0].Rows[i][FieldsName].ToString());
// col.Add(ds.Tables[0].Rows[i]["phone_no"].ToString());
}
cmb1.AutoCompleteSource = AutoCompleteSource.CustomSource;
cmb1.AutoCompleteCustomSource = col;
cmb1.AutoCompleteMode = AutoCompleteMode.Suggest;
con.Close();