BUG: Run-Time Error 380 "Invalid Property Value" with MaskEdBox

• Microsoft Visual Basic Professional and Enterprise Editions for Windows, versions 4.0, 5.0

SYMPTOMS

With Microsoft Visual Basic 4.0, when you set the Text property of a Mask Edit control at run-time, you receive the following error.

   Run-time Error 380:
   Invalid Property Value

CAUSE

This error occurs under the following circumstances:

• The Visible property of the Mask Edit control is set to False at design-time.

      -and-
  

• A later version of MSMASK32.OCX is installed. The error occurs with MSMASK32.OCX version 5.00.3714, which ships with Microsoft Visual Basic 5.0.

RESOLUTION

To work around this problem, set the Visible property of the Mask Edit control to True at design-time and then change it to False at run-time, perhaps during the Load event of the form.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this bug and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Steps to Reproduce Behavior

1. Start a new project in Visual Basic 4.0. Form1 is created by default.

2. Click Custom Controls on the Tools menu, and check "Microsoft Mask Edit Control."

3. Add a Mask Edit control to Form1, and set the following properties for the control:

      Property                 Value
      --------                 -----
      Visible                  False
      Mask                     &-&
   
   

4. Add the following code to the Click event of Form1.

         MaskEdBox1.Text = " - "
         MaskEdBox1.Visible = True
   

5. Press the F5 key to run the project.

6. Click the Form and note that the code should run as expected.

7. Click Make EXE on the File menu, and make an executable.

8. At a machine where Visual Basic 5.0 is installed, run the executable you created in the previous step.

   NOTE: If you receive an error that VB40032.DLL cannot be found when you run the executable, you will need to copy VB40032.DLL to the Windows\System directory.

9. Click the form. You will receive the run-time error 380 "Invalid Property Value" when your code attempts to set the Text property of the MaskEdBox.