problem with refershing the dropdownlist.

Hi frnds..
I m unable to refersh my dropdownlist after inserting the records.
i m using this for textboxes...
finally
            {
                
                txtStdWeight.Text = string.Empty;
                txtStdHeight.Text = string.Empty;
                txtDisabilityPercentage.Text = string.Empty;
                txtDisabilityDetail.Text = string.Empty;
                txtFoodAllergy.Text = string.Empty;
  &nb ...