SelectedValue which is invalid because it does not exist in the list of items
Apparently the solution I posted wasn't entirely effective... Eventually in my application I changed to this:
listOrgs.Items.Clear();listOrgs.SelectedIndex = -1;listOrgs.SelectedValue = null;listOrgs.ClearSelection(); // Clears the selection to avoid the exception (only one of these should be enough but in my application I needed all..)listOrgs.DataSource = new Organization().DTListAll(SiteID);listOrgs.DataTextField = "OrganizationName"; listOrgs.DataValueField = "OrganizationID"; listOrgs.DataBind();
I kept getting this error.
Weird thing is that before I set the datasource and rebind after deleting an item the selected index = -1.
If I explicitly set the selectedIndex = -1; then it works and doesn't throw an error.
So even though it was already -1 setting it to -1 stops it from erroring.
Weird eh?
Try setting listOrgs.SelectedValue = "0" after you refresh the DataSource
At the moment you are trying to select the first item in an empty list.