How do i update my datagrid if there's no ID columns in my dataset?

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C#

How do i update my datagrid if there's no ID columns in my dataset? Unique would be "Date" column. Date is entered by user. tblNUMBERSBS_1 is a binding source. Data is entered to table with no problem, then text fields 1 to 5 can be updated but no Date since that unique field of course. any ideas?

da.UpdateCommand = new SqlCommand("UPDATE tblNUMBERS_1 SET FirstNum = @FirstNum, SecondNum = @SecondNum, ThirdNum = @ThirdNum, FourthNum = @FourthNum, FifthNum = @FifthNum WHERE Date = @Date", cs);

da.UpdateCommand.Parameters.Add("@FirstNum", SqlDbType.Int).Value = int.Parse(txtFirstNum.Text);
da.UpdateCommand.Parameters.Add("@SecondNum", SqlDbType.Int).Value = int.Parse(txtSecondNum.Text);
da.UpdateCommand.Parameters.Add("@ThirdNum", SqlDbType.Int).Value = int.Parse(txtThirdNum.Text);
da.UpdateCommand.Parameters.Add("@FourthNum", SqlDbType.Int).Value = int.Parse(txtFourthNum.Text);
da.UpdateCommand.Parameters.Add("@FifthNum", SqlDbType.Int).Value = int.Parse(txtFifthNum.Text);

da.UpdateCommand.Parameters.Add("@Date", SqlDbType.DateTime).Value = ds.Tables[0].Rows[tblNUMBERSBS_1.Position][5];

          
cs.Open();
x = da.UpdateCommand.ExecuteNonQuery();
cs.Close();



Thanks..