How to: Draw a Filled Rectangle on a Windows Form


This example draws a filled rectangle on a form.

        System::Drawing::SolidBrush^ myBrush =
            gcnew System::Drawing::SolidBrush(System::Drawing::Color::Red);
        System::Drawing::Graphics^ formGraphics;
        formGraphics = this->CreateGraphics();
        formGraphics->FillRectangle(myBrush, Rectangle(0, 0, 200, 300));
        delete myBrush;
        delete formGraphics;

You cannot call this method in the Load event handler. The drawn content will not be redrawn if the form is resized or obscured by another form. To make your content automatically repaint, you should override the OnPaint method.

You should always call Dispose on any objects that consume system resources, such as Brush and Graphics objects.

Getting Started with Graphics Programming
Graphics and Drawing in Windows Forms
Using a Pen to Draw Lines and Shapes
Brushes and Filled Shapes in GDI+