VB Migration Partner

KNOWLEDGE BASE - Forms and controls

Previous | Index | Next 

[PRB] A migrated form doesn’t fire the Paint event

A migrated form that doesn’t contain any control doesn’t fire the Paint event.

The explanation for this behavior is the following: we have noticed that under certain circumstances the .NET form fires *two* Paint events, therefore the VB6Form class in VB Migration Partner’s support library usually ignores one of these two events. However, if the .NET form contains no child controls only a single Paint event is fired. The VB6Form class therefore ignores this only event and the client application doesn’t receive any notification.

There are two workaround for this issue:

  1. add a dummy control on the form. Even a 1x1 pixel control is ok.
  2. Add the following code to your form
        Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)
            IgnorePaintEvent = False
        End Sub
Previous | Index | Next 

Follow Francesco Balena on VB6 migration’s group on


Read Microsoft Corp’s official case study of a VB6 conversion using VB Migration Partner.

Code Architects and its partners offers remote and onsite migration services.

More details

Subscribe to our free newsletter for useful VB6 migration tips and techniques.


To learn more about your VB6 applications, run VB6 Analyzer on your source code and send us the generated text file. You will receive a detailed report about your VB6 applications and how VB Migration Partner can help you to quickly and effectively migrate it to .NET.

Get free advice

A fully-working, time-limited Trial Edition of VB Migration Partner allows you to test it against your actual code

Get the Trial

The price of VB Migration Partner depends on the size of the VB6 application, the type of license, and other factors

Request a quote

Migrating a VB6 application in 10 easy steps

Comparing VB Migration Partner with Upgrade Wizard

Migration tools: Feature Comparison Table

All whitepapers