HTTP 403 Forbidden error During using MS Chart Control within SharePoint Visual Web Part

I found out an unexpected behavior during using MS Chart Control within a SharePoint Visual Web Part.where I got 403 forbidden error at the first time I tried to browse the page.

403 forbidden

But when I tried to refresh the page again, the error disappeared !

Cause: Continue reading HTTP 403 Forbidden error During using MS Chart Control within SharePoint Visual Web Part

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