select value from datagridviewcombobox column and update on other datagridviewcombobox column

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C#2.0

C#

//1st combobox
DataGridViewComboBoxColumn col1= new DataGridViewComboBoxColumn();
                col1.ValueType = typeof(string);
                col1.Name = "Error Field";
                col1.Width = 25;
                dtErrors = ClassMain.tableBind("select DISTINCT Error_Field from ClientFeedBackError");
                col1.DataSource = dtErrors;
                col1.ValueMember = "Error_Field";
                col1.DisplayMember = "Error_Field";

                dataGridView1.Columns.Add(col1);

//2nd comboboxcolumn

                DataGridViewComboBoxColumn col2 = new DataGridViewComboBoxColumn();
                col2.ValueType = typeof(string);
                col2.Name = "Error Value";
                //col2.DataSource = 
                dataGridView1.Columns.Add(col2);
// col2 would be like "select Errorvalue from ClientFeedBackError where Error_Field = 'ANTEILA'"

i have two datagridview comboBoxcolumn on datagridview.i need to update the 2nd comboboxcolumn on the basis of 1st one.
----select Errorvalue from ClientFeedBackError where Error_Field = 'ANTEILA'

ANTEILA is the 1st value of comboboxcolumn col1.

Thanks for any Help!!!