'UsageDim itemId As String Dim instance As New DAItemDescriptor(itemId)
Parameters
- itemId
- Contains OPC item identifier.
 
            'UsageDim itemId As String Dim instance As New DAItemDescriptor(itemId)
| Exception | Description | 
|---|---|
| System.ArgumentNullException | 
             A  This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception. |