The ImageTransferMethod property indicates how the chart data is transferred to the source attribute of the <IMG> tag. ImageTransferEnum.Session places the chart data (byte array) into a Session variable, while ImageTransferEnum.Cache places the chart data into a Cache variable. ImageTransferEnum.File writes chart data to a temporary file.

This property only applies to the Manual, HTTPHandler, and ASP Page rendering methods. The following table lists what the effect of an intersection between a transfer method and render method produces: