cmd.CommandText = "INSERT INTO SSS_Contribution VALUES (" + txtEmployeeID.Text + " ,'" + txtEmployeeLastName.Text + "','" + txtEmployeeFirstName.Text + "','" + txtEmployeeMiddleName.Text + "', '" + txtSSSNo.Text + "', '" + txtClient.Text + "','" + txtCoordinator.Text + "', '0.00', '0.00', '0.00', " + y.ToString() + ", " + txtSSS.Text + ",(" + txtSSS.Text + " + " + y.ToString() + "), (" + y.ToString() +"), (" + txtSSS.Text + "), (" + txtSSS.Text + " + " + y.ToString() + "))";
* store concatenated section (i marked - underlined : to string and insert )