How to map JSON to C# Objects

I am having issues with understanding how to make this happen.

Basically we have an API, the user sends a JSON of the format:

{
  "Profile":[
    {
      "Name":"Joe",
      "Last":"Doe",
      "Client":{
        "ClientId":"1",
        "Product":"Apple",
        "Message":"Peter likes apples"
      },
      "Date":"2012-02-14"
    }
  ]
}

I have a class called Profile with parameters Name, Last, and an object as one of its members called Client as well as property Date.

Something like this:

public class Profile {
    public string Name {get; set;}
    public string Last {get; set;}
    public Client client {get; set;}
    public DateTime dDate {get; set;}
}

So basically, I am not sure how to grab the JSON and then map it to my object.

Any help with "helping" me understand would be much appreciated.