How to change default validation error message in ASP.NET MVC?

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Apparently my question was already answered at How to replace the default ModelState error message in Asp.net MVC 2? .

I’ll summarize it here:

  • Create App_GlobalResources folder for your project (right click to project -> Add -> Add ASP.NET folder -> App_GlobalResources).
  • Add a resx file in that folder. Say MyNewResource.resx.
  • Add resource key PropertyValueInvalid with the desired message format (e.g. “content {0} is invalid for field {1}”). If you want to change PropertyValueRequired too add it as well.
  • Add the code DefaultModelBinder.ResourceClassKey = "MyNewResource" to your Global.asax startup code.

You’re all set.

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