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I am trying to sort a column 'mem_id 'in already generated gridview. I dont get the result. Hereunder are my codes:

<asp:GridView ID="GridView2" runat="server"  HorizontalAlign="Center"  AutoGenerateColumns="False" allowpaging="True"  AllowSorting="True"
OnSorting="GridView2_Sorting" PageSize="12" onpageindexchanging="GridView2_PageIndexChanging" onselectedindexchanged="GridView2_SelectedIndexChanged"
  style="border-color: #808000; font-size:small; top: 176px; left: 27px; position: absolute; height: 75px; width:1350px" >
 

            <RowStyle HorizontalAlign="Center" />
            <Columns >
            <asp:BoundField DataField="mem_id" HeaderText="Mem_ID" sortexpression="Mem_id"/>
            <asp:BoundField DataField="mem_name" HeaderText="Mem Name"/>
            <asp:BoundField DataField="mobile" HeaderText="Cell No:"/>


code behind:

protected void GridView2_Sorting(object sender, GridViewSortEventArgs e)
{
GridView Gridview2 = (GridView)sender;
SqlDataSource ds = (SqlDataSource)Gridview2.DataSource;
ds.SelectCommand = ds.SelectCommand + " order by "
+ e.SortExpression;
Gridview2.DataSource = ds;
Gridview2.DataBind();

Can anyone guide me?
Posted 11-Jul-13 5:45am
Edited 11-Jul-13 5:51am
v2
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Solution 1

Create a sort property for the Sorting type
public SortDirection sortProperty
    {
        get
        {
            if (ViewState["SortingState"] == null)
            {
                ViewState["SortingState"] = SortDirection.Ascending;
            }
            return (SortDirection)ViewState["SortingState"];
        }
        set
        {
            ViewState["SortingState"] = value;
        }
    }


and inside the Sorting method


 dsProjects = projectDetails.GetProjectHistory(UserName);
        if (sortProperty == SortDirection.Ascending)
        {
            sortProperty = SortDirection.Descending;
            sortingDirection = "Desc";
        }
        else
        {
            sortProperty = SortDirection.Ascending;
            sortingDirection = "Asc";
             }
        DataView sortedView = new DataView(dsProjects.Tables[0]);
        sortedView.Sort = e.SortExpression + " " + sortingDirection;
        gvProjectHistory.DataSource = sortedView;
        gvProjectHistory.DataBind();

also check this links, it may helps you

http://csharpdotnetfreak.blogspot.com/2012/06/sorting-gridview-columns-headers-aspnet.html[^]

http://asp-net-example.blogspot.in/2008/12/aspnet-gridview-sorting-example-how-to.html[^]
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Solution 2

this is very old method of viewstate i have new idea do this

gridview.attributes.add("lastsort",'asc');

when user click on row then get value of attribute that is lastsort and its value is asc

and when clicked change attribute style to
gridview.attributes.add("lastsort",'desc');
so second time you get desc and vice versa its working excellent for me.....
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