Sorting in GridView + Asp.net

Question

What should I do to perform the sorting in grid view?

Please help

Answer 1

You can implement code like the following:

protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
{
     DataTable dataTable = GridView1.DataSource as DataTable;

     if (dataTable != null)
     {
          DataView dataView = new DataView(dataTable);
          dataView.Sort = e.SortExpression + " " + ConvertSortDirectionToSql(e.SortDirection);

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

private string ConvertSortDirectionToSql(SortDirection sortDirection)
{
     string newSortDirection = String.Empty;

     switch (sortDirection)
     {
          case SortDirection.Ascending:
              newSortDirection = "ASC";
          break;

          case SortDirection.Descending:
              newSortDirection = "DESC";
          break;
     }

     return newSortDirection;
}

With this code, your GridView definition should read:

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" AllowSorting="true" OnSorting="GridView1_Sorting">
<Columns>
    <asp:BoundField DataField="Name" HeaderText="People Names" SortExpression="Name" />
    <asp:BoundField DataField="Age" HeaderText="People Ages" SortExpression="Age" />
</Columns>
</asp:GridView>

Answer 2

Not sure if you have already added the event or not in your code behind.

You have AllowSorting="true" set for the GridView and therefore you need to have event handler for its Sorting event.

< asp:GridView AllowSorting=true ID="GridView1" runat="server" 
  OnSorting="GridView1_Sorting" >
    ...
< /asp:GridView >


protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)

{

     //Add your code here for handling

}