I'm trying to build an ASP site that populates a Table based on
the results of a selection in a ListBox. In order to do this, I've created a GridView table inside a div element. Currently
the default behavior is to show all
the items in
the specified table in sortable order.
However, I'd like to refine this further to allow for display of matches based on
the results from
the ListBox selection, but am not sure how to execute this.
The ListBox fires off a OnSelectionChanged event to
the method defined below and
the GridView element is defined as
<asp:GridView ID="dataListings" runat="server" AllowSorting="True"
AutoGenerateColumns="False" DataSourceID="LinqDataSource1"
OnDataBinding="ListBox1_SelectedIndexChanged">
protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
{
int itemSelected = selectTopics.SelectedIndex;
string[] listing = null;
switch (itemSelected)//assign listing
the array of course numbers
{
case 0:
break;
case 1:
listing = arts;
break;
case 2:
listing = currentEvents;
break;
.... More cases here
default:
listing = arts;
break;
}
using (OLLIDBDataContext odb = new OLLIDBDataContext())
{
var q =
from c in odb.tbl_CoursesAndWorkshops
where listing.Contains(c.tbl_Course_Description.tbl_CoursesAndWorkshops.course_workshop_number)
select c;
dataListings.DataSource = q;
dataListings.DataBind();
}
}
However, this method never gets fired. I can see a request being made when changing
the selection, but setting a breakpoint at
the method declaration does nothing at all.
Based on this, setup, I have three related questions
What do I need to modify to get
the OnSelectionChanged event handler to fire?
How can I alter
the GridView area to be empty on page load?
How do I send
the results from
the dataListings.DataBind() execution to show in
the GridView?
