Error "Parameter is not valid" when i minimized the form

These are the Error Message that i'm getting when i pressed customize Minimized button.

System.ArgumentException
  HResult=0x80070057
  Message=Parameter is not valid.
  Source=System.Drawing
  StackTrace:
   at System.Drawing.Bitmap..ctor(Int32 width, Int32 height, PixelFormat format)
   at System.Drawing.Bitmap..ctor(Int32 width, Int32 height)
   at CircularProgressBar.CircularProgressBar.RecreateBackgroundBrush()
   at CircularProgressBar.CircularProgressBar.ParentOnResize(Object sender, EventArgs eventArgs)
   at System.Windows.Forms.Control.OnResize(EventArgs e)
   at System.Windows.Forms.UserControl.OnResize(EventArgs e)
   at System.Windows.Forms.Control.OnSizeChanged(EventArgs e)
   at System.Windows.Forms.Control.UpdateBounds(Int32 x, Int32 y, Int32 width, Int32 height, Int32 clientWidth, Int32 clientHeight)
   at System.Windows.Forms.Control.UpdateBounds()
   at System.Windows.Forms.Control.WmWindowPosChanged(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at System.Windows.Forms.ContainerControl.WndProc(Message& m)
   at System.Windows.Forms.UserControl.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

When I started using new custom controls, I experienced the same error when attempting to minimize with a custom button. I could not figure it out until I looked at the detailed exception message.

System.ArgumentException
HResult=0x80070057
Message=Parameter is not valid.
Source=System.Drawing
StackTrace:
at System.Drawing.Bitmap..ctor(Int32 width, Int32 height, PixelFormat format)
at System.Drawing.Bitmap..ctor(Int32 width, Int32 height)
at Bunifu.UI.WinForms.BunifuGradientPanel.Refresh()
at Bunifu.UI.WinForms.BunifuGradientPanel.OnResize(EventArgs eventargs)

It was the new BunifuGradientPanel, which worked fine before, it was minimizing all day, but I stepped away from VS for a few hours and when I returned it started to error. Strange.

I am not sure but I suspect that the bunifuGradientPanel1 is not disposing itself properly.

To fix it, just do this.

    public bool isMinimized = false;

    private void iconButtonMinimize_Click(object sender, EventArgs e)
    {
        try
        {
            bunifuGradientPanel1.Dock = DockStyle.None; // Un-dock
            this.WindowState = FormWindowState.Minimized;
            isMinimized = true;
        }
        catch (Exception)
        {
           //...
        }
    }

    private void Form1_Resize(object sender, EventArgs e)
    {
        if (isMinimized == true)
        {
            bunifuGradientPanel1.Dock = DockStyle.Top;    // Re-dock
            bunifuGradientPanel1.Width = panelDesktop.Width; // maintain desired width
            isMinimized = false;
        }
    }

For people experiencing this same error but with non-Banifu controls, just do the same as above, but substitute Dock for Visibility. Your control is not rendering on minimize. So set visible = false when minimized. Set visible = true when you resize.

Right... this morning I realized that this error happens for my Banifu control when it is Docked. If undocked the error does not occur. But I need to Dock mine.

THE OFFICAL BANIFU SUPPORT RESPONSE: Gradient Panel is being resized to a point where it cannot be rendered on minimize. We will provide a fix for this most in the next release. Most probably in the next release.

Cool, but I fixed it.