How to make multi-language app in Winforms?

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Using Localizable and Language Property of Form

Form class have Localizable and Language Property. If you set Localizable property to true, you can add controls to form for default language and set properties for default language. Then you can select another languages and change properties for those languages. This way, value or localizable properties will store in separate resource files for different cultures.

Note: A property is considered as localizable if it’s decorated with [Localizable(true)] attribute. For example BackColor property is not localizable, but Text property is localizable.

Localizing Messages and Images using Resx Resource Files

The project has a Rseources.Resx file under Properties folder which you can use for localizing images and messages. Also you can add .resx Resource files to project. For example you can create a Strings.resx file and add some string key and values to it, then copy it as strings.en.resx and strings.fa.resx and edit values for those languages. Then you can use those resource values, For example:

MessageBox.Show(Properties.Resources.AreYouSure);

Will show the value of AreYouSure from Resources.Resx file with the current UI culture language.

If a resource key not found for a culture or the specified culture not found for the resource file, value of the key in neutral culture of the Resx file will be used.

Change the language at Run-time

You can set the culture of a application to Persian using:

System.Threading.Thread.CurrentThread.CurrentCulture =
    System.Globalization.CultureInfo.GetCultureInfo("fa");

System.Threading.Thread.CurrentThread.CurrentUICulture =
    System.Globalization.CultureInfo.GetCultureInfo("fa");

You should put the above code at start of your application or before showing a form.

More information

For more information and Example:

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