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Hi Alok, When any Web control is used to set the ZoomFacter and ZoomPosition in a Web Page, PostBack occurs. There is an alternative way to set the ZoomingFactor and Zooming Position without PostBack using ChartWebControl1_RefreshCallback() Event and RefreshFrequency property in ChartWebControl. Please refer to the attached sample. Let me know if this fulfills your requirement. Thanks for your interest in Syncfusion product. Regards, F.Rashidha.
Zooming0.zip