Session State Usage
RadChart has been deprecated since Q3 2014 and is no longer recommended for use, as it does not support modern browsers. We strongly recommend using RadHtmlChart, Telerik's modern client-side charting component. To transition from RadChart to RadHtmlChart, refer to the following migration articles:
Explore the RadHtmlChart documentation and online demos to determine how it fits your development needs.
You may want to disable Session for a web application that contains a RadChart instance. The chart image is retrieved using Session so you are restricted from setting EnableSessionState false in your Page directive or web.config file.
To disable session state and still display the chart:
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Set the RadChart UseSession property to False.
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Create a temporary folder for the chart image.
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Verify the web application has write permissions to the temporary folder.
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Set the RadChart TempImagesFolder property to the path of the temporary folder.
The zoom and scroll features of RadChart require session state usage.