dropdown not getting populated

ya

i kw there is no relation so suprised

                  if (!IsPostBack)                 {

 try
            {
                            sQuery = " SELECT distinct  city  from table  where 1=1";
                          //  sQuery = sQuery + criteria;
                            SqlCommand cmdtemp = new SqlCommand(sQuery, conn);
                            SqlDataReader drtemp = cmdtemp.ExecuteReader();
                            drpcity.DataSource = drtemp;
                            drpcity.DataTextField = "city";
                            drpcity.DataValueField = "city";
                            drpcity.DataBind();
                            drpcity.Items.Insert(0, new ListItem("ALL", string.Empty));
                            cmdtemp.Dispose();
                            drtemp.Close();
                 
            }
            catch (Exception e)
            {
                e.Message.ToString();
            }

 }