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Editorial Team
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Asked: 2026-05-24T01:59:10+00:00

I’m trying to use the Chart control in asp.net 4.0. While I know it

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I’m trying to use the Chart control in asp.net 4.0. While I know it required a separate install as part of 3.5, it’s included by default with 4.0.

I can see the Chart control in my toolbox, and I can drag it to my designer and see a preview of the chart. However, when I try to compile my website, I get an error stating:

The type or namespace name ‘DataVisualization’ does not exist in the namespace ‘System.Web.UI’ (are you missing an assembly reference?)

I receive the same error when I take a brand new page and add the following:

using System.Web.UI.DataVisualization;

Any ideas? I can understand why I would get this error in 3.5, but no clue why I would receive in 4.0, especially when I can see the control in the toolbox.

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1 Answer

  1. Editorial Team

    When I upgraded my website from .net 3.5 to 4.0, some of the references in my web.config didn’t automatically get updated to 4.0. After I manually updated them, everything worked.

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