The design view is out of sync with Source view in Visual Studio

In this article, we’re going to fix “The design view is out of sync with source view click here to synchronize views” that you may face when editing a user control in Visual Studio.


The design view is out of sync with Source view

In Visual Studio, I have a web user control within a page in ASP.NET web application as shown below:

The design view is out of sync with source view in Visual Studio

When I tried to edit the Front-code, I got unexpected behavior! where the ASP.NET controls disappeared and I got the below warning message:

The design view is out of sync with source view click here to synchronize views

Missing design view after editing Front-Code of Web User Control in ASP.NET

Cause

This issue usually occurs if there’s an error in the front code!

Solution

In my case, I checked and reviewed the front code carefully, and made sure that there are no errors in the front code!

After a long investigation trip, I decided to move any CSS code to the bottom of the user control. After moving CSS codes and CSS files to the bottom of user control. the design view is synchronized automatically and I can edit Front-code without missing the design view.

The design view is out of sync with source view

Note: If the User Control reference a CSS style-sheet you should also check it and ensure that it’s cleaned from error.


Conclusion

In conclusion, we have learned to fix this error “The design view is out of sync with Source view”, we should make sure that there is no errors in the front code like missing closed tag ..etc. also we should make sure that all linked CSS and JS files have no errors.

Applies To
  • ASP.Net 3.5.
  • Visual Studio.
See Also

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