GridView Sorting and Paging in Asp.net || How to Sort GridView rows in Asp.net || GridView onsorting Event and onpageindexchanging Event in Asp.net:

For GridView paging and sorting write the following code in source file of aspx webpage:

<asp:GridView

              ID="grdCause"

              runat="server

              EnableSortingAndPagingCallback="True"

              AllowPaging="True"

              AllowSorting="True"

              onpageindexchanging="grdCause_PageIndexChanging"

              onsorting="grdCause_Sorting"

         >

</asp:GridView>

The following method is for Loading the Gridview .In this method am taking dataset and bind that dataset to Gridview.

ExecuteProcedure is the method in my sqlhelper class.For that method Click here.

private void LoadGrid()

    {

       

        DataSet ds = dal.ExecuteProcudere("CauseSelectAll", ht);

        grdCause.DataSource = ds.Tables[0];

        grdCause.DataBind();

    }

Gridview pageindexChanging Event  for paging:

protected void grdCause_PageIndexChanging(object sender, GridViewPageEventArgs e)

    {

        grdCause.PageIndex = e.NewPageIndex;

        LoadGrid();

    }

Gridview Sorting  Event  for Sorting:

    protected void grdCause_Sorting(object sender, GridViewSortEventArgs e)

    {

        string sortExpression = e.SortExpression;

        if (GridViewSortDirection == SortDirection.Ascending)

        {

            GridViewSortDirection = SortDirection.Descending;

            SortGridView(sortExpression, DESCENDING);

        }

        else

        {

            GridViewSortDirection = SortDirection.Ascending;

            SortGridView(sortExpression, ASCENDING);

        }

    }

Use the following method for Sorting:

private void SortGridView(string sortExpression, string direction)

    {

        //  You can cache the DataTable for improving performance

        LoadGrid();

        DataTable dt = grdCause.DataSource as DataTable;

        DataView dv = new DataView(dt);

        dv.Sort = sortExpression + direction;

        grdCause.DataSource = dv;

        grdCause.DataBind();

    }

    private const string ASCENDING = " ASC";

    private const string DESCENDING = " DESC";

    public SortDirection GridViewSortDirection

    {

        get

        {

            if (ViewState["sortDirection"] == null)

                ViewState["sortDirection"] = SortDirection.Ascending;

            return (SortDirection)ViewState["sortDirection"];

        }

        set { ViewState["sortDirection"] = value;

 }

    }