Question

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Configuration;

using BiscomFax;


namespace FaxServer
{
    public partial class _Default : System.Web.UI.Page
    {
        public const string vsColumn = "Column";
        public const string vsSortDirection = "SortDirection";

        protected void Page_Load(object sender, EventArgs e)
        {
            if(!IsPostBack)
                ViewState[vsColumn] = "";
            List_Click(ActivityButton, e);
        }

        protected void List_Click(object sender, EventArgs e)
        {
            //using (new Impersonator("administrator", "mlabs.com", "100%secure*"))
            //{
                try
                {
                    Fax fax = new Fax();
                    ConnObj cnObj = GetConfiguration();
                    Button btn = (Button)sender;
                    string sort = "";

                    DataTable dt = new DataTable();

                    switch (btn.CommandName)
                    {
                        case "Activity":
                            sort = "DateTime";
                            dt = fax.GetActivityLog(cnObj.faxDir, cnObj.faxUsername, cnObj.faxPassword);
                            break;
                        case "Message":
                            sort = "DateTime";
                            dt = fax.GetMessageStatus(cnObj.faxDir, cnObj.faxUsername, cnObj.faxPassword);
                            break;
                        case "Pending":
                            sort = "DeliveryTime";
                            dt = fax.GetPendingList(cnObj.faxDir, cnObj.faxUsername, cnObj.faxPassword);
                            break;
                        default:
                            sort = "DateTime";
                            dt = fax.GetActivityLog(cnObj.faxDir, cnObj.faxUsername, cnObj.faxPassword);
                            break;

                    }

                    GridView1.DataSource = dt;
                    GridView1.Sort(sort, SortDirection.Descending);
                    GridView1.DataBind();
                }
                catch (Exception ex)
                {
                    throw ex;
                }
            //}
        }



        protected void gridView_Sorting(object sender, GridViewSortEventArgs e)
        {

            DataTable dt = GridView1.DataSource as DataTable;

            if (dt != null)
            {
                DataView dv = new DataView(dt);
                string oldSort = ViewState[vsColumn].ToString();

                dv.Sort = e.SortExpression + " " + convertSorDirectionToSql(e.SortDirection);

                if (dv.Sort == oldSort)
                    dv.Sort = e.SortExpression + " " + convertSorDirectionToSql(SortDirection.Descending);

                ViewState[vsColumn] = dv.Sort;

                GridView1.DataSource = dv;
                GridView1.DataBind();
            }

        }

i am having a very difficult time sorting the contents of this gridview, i know that i am binding correctly becuase the data is showing but the data does not get sorted at all by DateTime. what am i doing wrongly?

Answer 1

Lets look at this line

 dv.Sort = e.SortExpression + " " + convertSorDirectionToSql(e.SortDirection);

While testing, when you put a breakpoint on this line what value did e.SortExpression have?