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TreeGridColumn is not a known element

Thread ID:





131496 Jul 13,2017 07:28 AM UTC Jul 17,2017 04:10 AM UTC ASP.NET Web Forms 3
Tags: TreeGrid
Kadam, Suresh B. (WTIC 535) CWR
Asked On July 13, 2017 07:28 AM UTC

Hi Team,

I am trying to use TreeGrid in my application. Registered both Syncfusion.Ej and Syncfusion.Ej.Web in Web.config under assemblies. Registered both assemblies on the page I am trying to use TreeGrid. But when I declare control in page. I am getting error "TreeGridColumn is not a known element".

Please suggest how to get columns for TreeGrid.


Jayakumar Duraisamy [Syncfusion]
Replied On July 14, 2017 10:54 AM UTC

Hi Suresh, 
Thanks for contacting Syncfusion support. 
We have analyzed your reported issue and it is cause due to missing of “Syncfusion.Javascript.Web” namespace from the “Syncfusion.EJ.Web & Syncfusion.EJ”. Hence, we should add these namespace under controls in web.config file. 
Please refer following code snippet, 
        <add namespace="System.Web.Optimization"/> 
        <add assembly="Microsoft.AspNet.Web.Optimization.WebForms" namespace="Microsoft.AspNet.Web.Optimization.WebForms" tagPrefix="webopt"/> 
        <add namespace="Syncfusion.JavaScript.Web" assembly="Syncfusion.EJ.Web, Version=15.2451.0.46, Culture=neutral, PublicKeyToken=3d67ed1f87d44c89" tagPrefix="ej"/> 
        <add namespace="Syncfusion.JavaScript.Web" assembly="Syncfusion.EJ, Version=15.2451.0.46, Culture=neutral, PublicKeyToken=3d67ed1f87d44c89" tagPrefix="ej"/> 
        <add namespace="Syncfusion.JavaScript.Models" assembly="Syncfusion.EJ, Version=15.2451.0.46, Culture=neutral, PublicKeyToken=3d67ed1f87d44c89" tagPrefix="ej"/> 
We have also prepared a sample for your reference. Please find the sample location as below, 
If the given solution doesn’t resolve your reported issue then please share your application, it will be helpful for us to serve you better. 
Jayakumar D 

Kadam, Suresh B. (WTIC 535) CWR
Replied On July 14, 2017 10:57 AM UTC

Hi Jayakumar,

Thank you very much. The issue has been resolved with your suggestion.


Suresh Kadam.

Jayakumar Duraisamy [Syncfusion]
Replied On July 17, 2017 04:10 AM UTC

Hi Kadam, 
We are glad that your issue has been resolved. Please let us know if you need any other assistance. 
Jayakumar D 


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