You can use ASP.NET Local resources. You can create a custom resource class. You can take a look at this post
.For properties,if you want to have them in multilingual mode you have to mark the property with MultilingualProperty
Note that this should be a string property.
You can use Administration >> Interfaces and Labels to add a new key which you can access in your control as shown below
var res = Res.Get("Labels
We recommend creating a separate classes for your custom keys and not mix them with the default one. Thus, you can separate the built-in and custom logic easily and this will ensure that there would not be a problem if you import or export a language pack.
All the best,
the Telerik team
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