Get values of Datagridview combobox

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C#2.0

C#

I have a dataGridView in windows.

In the dataGridView i have a combox.
Now i populate values in this combobox,

so initially i fill values in Datatable,

SqlConnection objConn = new SqlConnection(fstrConn);
SqlDataAdapter objDA;
DataTable DTResult = new DataTable();

objDA = new SqlDataAdapter(fstrSQL, fstrConn);
objDA.Fill(DTResult);

Next in dataGridView_CellBeginEdit event i am populating values to combobox,

private void dataGridView_CellBeginEdit(object sender,DataGridViewCellCancelEventArgs e)
{
DataGridViewComboBoxCell objCbo=new DataGridViewComboBoxCell();
objCbo=(DataGridViewComboBoxCell)dataGridView.Rows[e.RowIndex].Cells[0];

for (int i = 0; i < DTResult.Rows.Count; i++)
{
    objCbo.Items.Add(DTResult.Rows[i][ColumnName].ToString());
    objCbo.DisplayMember = ColumnName;
    objCbo.ValueMember = ColumnName;
}

}


after this when i select a value in this combobox,
i need to get the value of valuemember.

so plz help me.......
thanks n advnz..........