System.Web.Mvc.HtmlHelper<dynamic> does not contain a definition for 'Syncfusion' Error

I'm working with ASP.Net MVC 3 with the Razor engine and version 9.104.0.20 of the SyncFusion mvc control suite.

In the documentation for this control, I am to put lines of code similar to 开发者_StackOverflow社区the below in my master page:

@Html.Syncfusion().ScriptManager()

Per the Syncfusion documentation and this Stack Overflow suggestion, I have made sure to add the namespaces to my web.config file under the element.

   <add namespace="Syncfusion.Mvc.Schedule"/>

The solution builds but I get the following error when I run it:

'System.Web.Mvc.HtmlHelper' does not contain a definition for 'Syncfusion' and no extension method 'Syncfusion' accepting a first argument of type 'System.Web.Mvc.HtmlHelper' could be found (are you missing a using directive or an assembly reference?)

I don't think this issue has to do with Syncfusion but instead with my inability to reference their assemblies correctly.

How do I address this?

The issue was resolved by adding the namespace reference in the element.

I had to add the following configSection information at the top of the web.config:

<configSections>
    <sectionGroup name="system.web.webPages.razor" type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup, System.Web.WebPages.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
      <section name="host" type="System.Web.WebPages.Razor.Configuration.HostSection, System.Web.WebPages.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
      <section name="pages" type="System.Web.WebPages.Razor.Configuration.RazorPagesSection, System.Web.WebPages.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
    </sectionGroup>
  </configSections>

And then I had to add the SyncFusion namespaces within that defined section:

<system.web.webPages.razor>
    <host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
    <pages pageBaseType="System.Web.Mvc.WebViewPage">
      <namespaces>
        <add namespace="System.Web.Mvc" />
        <add namespace="System.Web.Mvc.Ajax" />
        <add namespace="System.Web.Mvc.Html" />
        <add namespace="System.Web.Routing" />
        <add namespace="System.Collections" />
        <add namespace="Syncfusion.Mvc.Shared"/>
        <add namespace="Syncfusion.Mvc.Schedule"/>
        <add namespace="Syncfusion.Mvc.Tools"/>
      </namespaces>
    </pages>
  </system.web.webPages.razor>

For me, I had to close Visual Studio and reopen after implementing @YeahStu 's answer.

It may be that you need to copy DevExpress/any other namespaces from the ~/Web.config configuration file to the ~/View/Web.config configuration file or any other Web.config file

This was the solution I used with worked PERFECTLY