Question

I’m converting functionality from an asp.net Gridview to a Listview. In the gridview when the selected item changed I would grab a value from a label in the selected row and write it to a different label outside of the gridview.

Protected Sub grdModules_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles grdModules.SelectedIndexChanged      Dim lblModuleTitle As Label = grdModules.SelectedRow.FindControl('lblModuleTitle')     lblCurrentModule.Text = lblModuleTitle.Text  End Sub 

In a Listview, there isn’t a ‘SelectedRow’ concept but a SelectedItem. However you can’t do findcontrol against the selected item. When I try to do the following (I get a null reference exception):

Protected Sub listviewModules_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles listviewModules.SelectedIndexChanged      Dim lblModuleTitle As Label = CType(listviewModules.FindControl('lblModuleTitle'), Label)     lblCurrentModule.Text = lblModuleTitle.Text  End Sub 

Does anyone know the way to find a control inside the selected item template?

Answer 1

You’re calling FindControl on the whole ListView, rather than just the selected item. This should work:

Dim lblModuleTitle As Label = CType(listviewModules.Items(listviewModules.SelectedIndex).FindControl('lblModuleTitle'), Label)