How can I draw on Panel so it does not blink?

Question

This is my code. When I move cursor over Form it works, circle is moving but it is blinking. How can I fix this?

public partial class Preprocesor : Form
{
    in         


        

Answer 1

How bout overriding a panel user control and set Doublebuffered to true?

public partial class BufferPanel : Panel
{
    public BufferPanel()
    {
        SetStyle(ControlStyles.AllPaintingInWmPaint, true);
        SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
        UpdateStyles();
    }
}

Answer 2

You need to draw on a double-buffered control.

Make a class that inherits Control and sets DoubleBuffered = true; in the constructor (this is a protected property).
Use that control instead of your panel it there won't be any flickering.

Also, you should not store a Graphics object for later.
Instead, you should draw on e.Graphics in the Paint handler.