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

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.