Question

How can I implement bi-directional sorting in the GridView, with the condition that my GridView is not bind to SQL but to datatable-column-row & dataset.

Thanks!

Answer 1

Put your Datatable in the Viewstate when you bind it for the first time.

gridView1.DataBind();
ViewState["dtbl"] = YourDataTable

Here is the code, that allows you to do this…

protected void ComponentGridView_Sorting(object sender, GridViewSortEventArgs e)
{
DataTable dataTable = ViewState["dtbl"] as DataTable;

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

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

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

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

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

return newSortDirection;
}

For details, please look at this MSDN article GridView.Sorting