how to add namespace for this [Computed], [ScriptIgnore], [JsonIgnore]

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ASP.NET

MVC4

Knockout.js

hello sir,

i am a new in knockout,
so trying to learn knockout with mvc
in one o fexample i seen these coding

public class HelloWorldModel
{
    public string FirstName { get; set; }
    public string LastName { get; set; }

    [Computed]
    [ScriptIgnore]
    [JsonIgnore]
    public string FullName
    {
        get { return FirstName + " " + LastName; }
    }
}

so my question is how to add namespace for this [Computed], [ScriptIgnore], [JsonIgnore],

sir if you know any website link to learn mvc with knockout then plese reffer me

thanks in advance