Assembly: System.Web (in system.web.dll)
The following code example draws three overlapping rectangles when the page is requested. The code begins by setting the ContentType property to image/jpeg, so that the entire page will be rendered as a JPEG image. The code then calls the Clear method to ensure that no extraneous content, including headers, are sent with this response. Next, the code sets the BufferOutput property to true so that the page is completely processed before it is sent to the requesting client. Two objects used to draw the rectangles are then created, a Bitmap and a Graphics object. The variables created in the page are used as coordinates to draw the rectangles and a string that appears inside the largest rectangle.
When the three rectangles and the string that appears inside them are drawn, the Bitmap is saved to the Stream object associated with the OutputStream property, and its format is set to JPEG. The code calls the Dispose and Dispose methods to release the resources used by the two drawing objects. Lastly, the code calls the Flush method to send the buffered response to the requesting client.
Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.