PRB: User Connection Object Connect Property Remains Populated (177592)


The information in this article applies to:

  • Microsoft Visual Basic Enterprise Edition for Windows 5.0
  • Microsoft Visual Basic Enterprise Edition for Windows 6.0
This article was previously published under Q177592

SYMPTOMS

When a UserConnection object is declared at the global level, the userid and password stored in the Connect property remains populated after the connection is closed.

RESOLUTION

To make sure the userid and password in Connect property is cleared after closing the connection, you can set the user connection object to Nothing right after closing the connection, such as:

uc.close
SET uc = Nothing

You could also store the initial value of the Connect property to a variable, and replace the Connect property with that value after the connection is closed, such as the following:

Dim myConnect As String
myConnect = uc.Connect
uc.EstablishConnection
uc.Close
uc.Connect = myConnect

STATUS

Microsoft is researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Steps to Reproduce Behavior

Task 1: Create the UserConnection

  1. Start a new project in Visual Basic and choose "Standard EXE." Form1 is created by default.
  2. From the Project menu, select Components, select the Designers tab, and then place a check next to Microsoft UserConnection.
  3. From the Project menu, select Add ActiveX Designer, and then select Microsoft UserConnection. This will bring up a dialog titled "UserConnection1 Properties."
  4. On the Connection tab, select either a DSN or DSN-less connection and fill in the appropriate information. On the Authentication tab, leave User Name and Password blank. At ODBC Prompt Behavior dropdown box, choose "Only when needed."
  5. Click OK to save this information and return to the Designer window.

Task 21: Build the Visual Basic Code

  1. Add two CommandButtons, Command1 and Command2, to Form1. Command1 establishes the connection; Command2 closes it Both display the Connect property in the debug window.
  2. Paste the following code in the General Declaration section of Form1: 
          ' *** To workaround the problem:
      ' *** Uncomment the 2 lines of VB code to re-set
      ' *** Connect property using variable myConnect
      ' ***

      Dim uc As New UserConnection1
      Dim myConnect As String

      Private Sub Command1_Click()
         '  myConnect = uc.Connect
         Debug.Print uc.Connect
         uc.EstablishConnection
      End Sub

      Private Sub Command2_Click()
         uc.Close
         '  uc.Connect = myConnect
         Debug.Print uc.Connect
      End Sub

      Private Sub Form_Load()
         Command1.Caption = "Establish Connection"
         Command2.Caption = "Close Connection"
      End Sub

      Private Sub Form_Unload(Cancel As Integer)
         Set uc = Nothing
      End Sub
  3. Press F5 key to start the program.
NOTE: Because the userid and password remain populated in the Connect property after closing the connection, you are only prompted once for the authentication information after the first connection is established.

REFERENCES

For additional information about User Connection Designer, please see the following article in the Microsoft Knowledge Base:

166281 HOWTO: Create and Implement a UserConnection

(c) Microsoft Corporation 1997, All Rights Reserved. Contributions by Adrian Chiang, Microsoft Corporation
Modification Type:MinorLast Reviewed:1/8/2003
Keywords:kbprb KB177592
©2002 Microsoft Corporation. All rights reserved.