Error creating control - Chart 1 with ASP.NET Chart

Question

I need to create a sharepoint 2010 web part with Visual studio 2010. My web part need to show ASP.NET Chart.

To create this web part I added Visual Web Part Option from the SharePoint Installed templates in VS 2010. and then I dragged ASP.NET Chart control. But when i add this ASP.NET chart to the VS 2010 it shows me an error : Error creating control - Chart 1 Object reference not set to an instance of an object.

<%@ Assembly Name="$SharePoint.Project.AssemblyFullName$" %>
<%@ Assembly Name="Microsoft.Web.CommandUI, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %> 
<%@ Register Tagprefix="SharePoint" Namespace="Microsoft.SharePoint.WebControls" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %> 
<%@ Register Tagprefix="Utilities" Namespace="Microsoft.SharePoint.Utilities" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Register Tagprefix="asp" Namespace="System.Web.UI" Assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %>
<%@ Import Namespace="Microsoft.SharePoint" %> 
<%@ Register Tagprefix="WebPartPages" Namespace="Microsoft.SharePoint.WebPartPages" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="Sh_ViolationGraphUserControl.ascx.cs" Inherits="NWC.iReports.Sh.Sh_ViolationGraph.Sh_ViolationGraphUserControl" %>
<%@ Register Assembly="System.Web.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
    Namespace="System.Web.UI.DataVisualization.Charting" TagPrefix="asp" %>


<asp:Chart ID="Chart1" runat="server">
    <Series>
        <asp:Series Name="Series1">
        </asp:Series>
    </Series>
    <ChartAreas>
        <asp:ChartArea Name="ChartArea1">
        </asp:ChartArea>
    </ChartAreas>
</asp:Chart>

This is the code. 

So please help me to how I can add a ASP.NET chart control to a SharePoint user control page.

Note: I created a separate ASP.NET web site by using VS 2010 and then added this control then its work fine. So the problem is while adding to the SharePoint web part

Regards

Shaji

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I am new to SharePoint

Answer 1

As per the code you pasted above i can see two assemblies are registered with same prefix as below

<%@ Register Tagprefix="asp" Namespace="System.Web.UI" Assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %>
<%@ Register Assembly="System.Web.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
    Namespace="System.Web.UI.DataVisualization.Charting" TagPrefix="asp" %>

Use different prefix for second assembly and then initialize control with new prefix.

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w: blog.sandippatil.com | t: @sharesandip

Answer 2

did you register the System.Web.DataVisualization as safecontrol?

Answer 3

which prefix can we use?? I see that the error only happens when using webparts

Answer 4

Did you find any solution to this issue?