The GaugeImagePipe™ control is used to stream images without touching the file system, instead using the Session State. When the WebGauge’s™ DeploymentScenario.Mode property is set to Session, the GaugeImagePipe is used on a separate WebForm, through which the image is streamed to the client on each request.
For more information, please refer to the topic WebGauge Session State Image Deployment.