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Why the error "syncfusion not found" occur in WinForms GridGrouping?

6 mins read

The error “type or namespace name ‘Syncfusion’ could not be found (are you missing a using directive or an assembly reference?)” occurs due to the following reasons: 

  1. Referring the application’s reference DLLs like the DLL version as Target Framework version. 
  • TargetFramework version is lower than Syncfusion DLL’s version 


TargetFramwork version: 3.5 

Syncfusion Installed framework version: 4.6

  1. Creating application under one .NET Framework. 
  • You can use multiple projects for your application. In every application, referred Syncfusion DLLs version should be the same. 
  1. The GAC assemblies are removed or reference path differs from the Target Framework. 
  • Trying to refer the higher version DLLs in lower framework version projects.Image show the TargetFrameworkVersion of ProjectImage show the Syncfusion assembly reference path
  1. Mismatching assemblies of GAC assemblies and user defined reference path assemblies. 
  • You can see this by opening your project in notepad or unloading and editing your project in Visual Studio. Syncfusion assemblies should not be as illustrated in the following screenshot.Image shows the assembly referred  with GAC assembly path
  • So, remove the hint path and assembly settings like as below illustrated screenshotImage shows the assembly referred  without GAC assembly path


I hope you enjoyed learning about why does the error "the type or namespace name 'syncfusion' could not be found(are you missing a using directive or an assemble reference)" occur.

You can refer to our WinForms GridControl feature tour page to know about its other groundbreaking feature representations. You can also explore our WinForms GridControl documentation to understand how to create and manipulate data.

For current customers, you can check out our components from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our other controls.

If you have any queries or require clarifications, please let us know in the comments section below. You can also contact us through our support forumsDirect-Trac, or feedback portal. We are always happy to assist you!

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