SelectedValue which is invalid because it does not exist in the list of items

Question

I encounter this problem repeatedly, and haven\'t a clue what is causing it. I get an exception in the DataBind: SelectedValue which is invalid because it does not exist i

Answer 1

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.

Answer 2

Not sure it is your case, but I had the same problem and apparently there was no explanation, then I realized doing a copy and paste on notepad of a field of database that at the beginning of the value there was a NULL.

Curious thing was that a select joining tables was working. I deleted the row and reinserted, after was working fine.

Answer 3

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?

Answer 4

In case you still have this problem this is how i resolved it:

listOrgs.SelectedIndex = -1;    // Clears the SelectedIndex to avoid the exception
listOrgs.DataSource = new Organization().DTListAll(SiteID);
listOrgs.DataTextField = "OrganizationName"; 
listOrgs.DataValueField = "OrganizationID"; 
listOrgs.DataBind();            //Unless you have "listOrgs.AppendDataBoundItems = true" you don't need to clear the list

Answer 5

Change the first two line with this :

listOrgs.SelectedItem.Selected = false; 
listOrgs.Items.Clear(); 

Answer 6

@PMarques answer helped me out and did solve my problem.

However whilst experimenting, it clicked in my head why I was gettign the error in the first place.

I was setting the "Text" attribute thinking that it might create an encompassing label or fieldset + legend, for me (which it doesn't).

The Text property for a list is infact the SelectedValue property for a ListControl.

So my mistake in misinterpreting what the text property did.