The following code example modifies the OnPaint event handler to retrieve a pointer to the xref:System.Drawing.Graphics object for the main form. The xref:System.Windows.Forms.Form.OnPaint%2A function is intended for a Windows Forms application, most likely created with a Visual Studio application wizard.

The image is represented by the xref:System.Drawing.Image class. The image data is loaded from a .jpg file using the xref:System.Drawing.Image.FromFile%2A?displayProperty=fullName method. Before the image is drawn to the form, the form is resized to accommodate the image. The drawing of the image is performed with the xref:System.Drawing.Graphics.DrawImage%2A?displayProperty=fullName method.

The xref:System.Drawing.Graphics and xref:System.Drawing.Image classes are both in the xref:System.Drawing?displayProperty=fullName namespace.

#using <system.drawing.dll>  
  
using namespace System;  
using namespace System::Drawing;  
  
protected:  
virtual Void Form1::OnPaint(PaintEventArgs^ pe) override  
{  
    Graphics^ g = pe->Graphics;  
    Image^ image = Image::FromFile("SampleImage.jpg");  
    Form::ClientSize = image->Size;  
    g->DrawImage( image, 0, 0, image->Size.Width, image->Size.Height );  
}  

xref:System.Drawing?displayProperty=fullName
.NET Programming with C++/CLI (Visual C++)