Double Buffering when not drawing in OnPaint(): why doesn’t it work?

by 
g = doc.CreateGraphics();

That’s the mistake. Double-buffering can only work if you draw into the buffer. The one that e.Graphics references. Fix:

g = e.Graphics;

Beware that Panel doesn’t have double-buffering turned on by default. You’ll need to derive your own. Paste this into a new class:

using System;
using System.Windows.Forms;

class BufferedPanel : Panel {
    public BufferedPanel() {
        this.DoubleBuffered = true;
        this.ResizeRedraw = true;
    }
}

Compile. Drop it from the top of the toolbox.

More Related Contents:

  1. Resize image proportionally with MaxHeight and MaxWidth constraints
  2. Properly draw text using GraphicsPath
  3. How to make two transparent layer with c#?
  4. How can I treat the circle as a control after drawing it? – Moving and selecting shapes
  5. Creating Custom Picturebox with Draggable and Resizable Selection Window
  6. Hiding unwanted properties in custom controls
  7. Image is not drawn at the correct spot
  8. Show Transparent Loading Spinner above other Controls
  9. Flip the GraphicsPath that draws the text/string
  10. How to highlight wrapped text in a control using the graphics?
  11. How to save shapes which I draw on a Panel as binary
  12. How to create a User Control with rounded corners?
  13. How to eliminate flicker in Windows.Forms custom control when scrolling?
  14. Remove top and bottom padding from Text drawn on an Image
  15. Implementing INotifyPropertyChanged – does a better way exist?
  16. How do I make a WinForms app go Full Screen
  17. How to return a value from a Form in C#?
  18. How to save a List on Settings.Default?
  19. Get File Icon used by Shell
  20. Model-View-Presenter in WinForms
  21. Button inside a WinForms textbox
  22. Transparent window layer that is click-through and always stays on top
  23. Draw multiple freehand Polyline or Curve drawing – Adding Undo Feature
  24. Any trick to use opacity on a panel in Visual Studio Window Form?
  25. Show controls added programmatically in WinForms app in Design view?
  26. How do I disable some dates on a DateTimePicker control?
  27. TLS 1.2 not negotiated in .NET 4.7 without explicit ServicePointManager.SecurityProtocol call
  28. Make a BackgroundWorker do several operations sequentially without freezing the form
  29. Process.Start(url) fails
  30. How to use dependency injection in WinForms

Leave a Comment