Program doesnt compile because variable not defined?????

[karaajay]

Everytime i try and compile the program it gives me an error saying:

compile error:

variable not defined

The piece of code where the error is cumin from is this:

Public Sub UpdatecboProductID()
    Adodc1.Recordset.MoveFirst
    Do While Not Adodc1.Recordset.EOF
        cboProductId.AddItem Adodc1.Recordset.Fields("ProductID")
        Adodc1.Recordset.MoveNext
    Loop
    Adodc1.Recordset.MoveFirst
End Sub

it saying this is not defined:

cboProductId

anyone has any ideas?