The field must be a number. How to change this message to another language?

Question

How can I change that messages for all `int` fields so that instead of saying: `The field must be a number` in English, it shows: `El campo tiene que ser numerico` in Spanish. Is there are a way?

Accepted Answer

If you happen to be using ASP.NET MVC 4 onwards, check this post:

Localizing Default Error Messages in ASP.NET MVC and WebForms

Basically you have to add the following piece of code in your `Application_Start()` method in `Global.asax`:

```
 ClientDataTypeModelValidatorProvider.ResourceClassKey = "Messages";
 DefaultModelBinder.ResourceClassKey = "Messages";
```

Right click your ASP.NET MVC project in Solution Explorer inside Visual Studio and select `Add => Add ASP.NET Folder => App_GlobalResources`.

Now add a `.resx` file inside this folder called `Messages.resx`.

Finally add the following string resources in that `.resx` file:

```
Name                   Value
====                   =====
FieldMustBeDate        The field {0} must be a date.
FieldMustBeNumeric     The field {0} must be a number.
PropertyValueInvalid   The value '{0}' is not valid for {1}.
PropertyValueRequired  A value is required.
```

You should be good to go.

Note that the value you're interested in is the `FieldMustBeNumeric`. To localize it to Spanish, you have to add another resource file named `Messages.es.resx`. In this specific `.resx` file replace the resource value with:

```
Name                Value
====                =====
FieldMustBeNumeric  El campo {0} tiene que ser numerico.
```

If you happen to be using ASP.NET MVC 3 downwards, this solution can help you achieve the same result: https://stackoverflow.com/a/2551481/114029

The field must be a number. How to change this message to another language?

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