C#

PrabaSozhan R

the type or namespace name data visualization does not exist in the name space system.windows form

4 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes12y ago
Well, the full name of the namespace is:

System.Windows.Forms.DataVisualization.Charting

So you need to add a 'using' directive for that namespace if, say, you want to create a Chart.

As Rajendra said, you also need to add a reference to System.Windows.Forms.DataVisualization.dll if you haven't done so already.

0
Rajendra Tripathy12y ago
You are very likely missing a reference to the DataVisualization DLL. Note that although they share the namespace of System.Windows.Forms.dll, they aren't actually contained within it.
0
Abhishek Jaiswal12y ago
Hey!

Do you reference it in your web.config

under the controls tag (path: "< system.web>") :

< add tagPrefix="asp" namespace="System.Web.UI.DataVisualization.Charting" assembly="System.Web.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>

under "< httphandlers>") :

< add path="ChartImg.axd" verb="GET,HEAD" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" validate="false"/>

I wish that gonna work for you.
0
Dipankar Biswas12y ago
Did you add reference to System.Web.DataVisualization?
0