dropdownlist not showing records

See more:

C#

ASP.NET

this is my code where i am binding data to ddl, when i debug the code, it shows all values correctly, but when i run the same, it neither shows any value nor gives Error...

protected void ddlGodownName_SelectedIndexChanged(object sender, EventArgs e)
      {
          if (ddlGodownName.Text!="")
          {
               objLocationMaster.IntMode = 9;
              objLocationMaster.GodawnName = ddlGodownName.Text.Trim();
              DataTable dt = objBAL.getDistinctColumns(objLocationMaster);
              for (int i = 0; i < dt.Rows.Count; i++)
              {
                  ddlrowno.Items.Add(dt.Rows[i]["RowNo"].ToString());
                  ddlcolno.Items.Add(dt.Rows[i]["columnno"].ToString());
                  ddllvlno.Items.Add(dt.Rows[i]["LevelNo"].ToString());
              }
               ddlrowno.Items.Add("Hi");

              //    ddlrowno.DataTextField = "RowNo";
              //ddlrowno.DataValueField = "RowNo";
              //ddlrowno.DataBind();

              //ddlcolno.DataSource = dt;
              //ddlcolno.DataTextField = "columnno";
              //ddlcolno.DataValueField = "columnno";
              //ddlcolno.DataBind();

              //ddllvlno.DataSource = dt;
              //ddllvlno.DataTextField = "LevelNo";
              //ddllvlno.DataValueField = "LevelNo";
              //ddllvlno.DataBind();
          }
      }