Dim dblingua As New DataClassesDataContext
 Dim query2 = From l In dblingua.linguas _
                    Select l.codice, l.descrizione
               
CmbLingua.DataTextField = "descrizione"
CmbLingua.DataValueField = "codice"
   
CmbLingua.DataSource = query2
CmbLingua.DataBind()
        
CmbLingua.Items.Add(New ListItem("Seleziona", 0))
CmbLingua.SelectedValue = 0

 
'CmbLingua' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.ArgumentOutOfRangeException: 'CmbLingua' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value

Source Error: 


Line 35:         
Line 36:         CmbLingua.DataSource = query2
Line 37:         CmbLingua.DataBind() 
Line 38:         
Line 39:         CmbLingua.Items.Add(New ListItem("Seleziona", 0))