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HOW TO: Using sorting / paging on GridView w/o a DataSourceControl DataSource

If you set AllowPaging=”true” or AllowSorting=”true” on a GridView control without using a DataSourceControl DataSource (i.e. SqlDataSource, ObjectDataSource), you will run into the following errors:

When changing the page on the GridView control:

The GridView ‘GridViewID’ fired event PageIndexChanging which wasn’t handled.

When clicking a column name to sort the column on the GridView control:

The GridView ‘GridViewID’ fired event Sorting which wasn’t handled.

As a result of not setting the DataSourceID property of the GridView to a DataSourceControl DataSource, you have to add event handlers for sorting and paging.

<asp:GridView ID=”gridView” OnPageIndexChanging=”gridView_PageIndexChanging” OnSorting=”gridView_Sorting” runat=”server” />

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;
}

protected void gridView_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
gridView.PageIndex = e.NewPageIndex;
gridView.DataBind();
}

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

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

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

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