why do we use HttpContext.Current?

Question

I don't know, why do we use HttpContext.Current?
In this property I use it for Session but I don't know why!

public static string Name
{
    get
    {
         if (HttpContext.Current.Session["_n_"] != null)
            return HttpContext.Current.Session["_n_"].ToString();
         else return "";
    }
    set
    {
         HttpContext.Current.Session["_n_"] = value;
    }
}

Answer 1

HttpContext is an object that wraps all http related information into one place. HttpContext.Current is a context that has been created during the active request. Here is the list of some data that you can obtain from it.

1. Request type (Post, Get)
2. Request parameters (querystring, posted data)
3. User's IP address
4. Cookies

Further you can control your output through this object. In Items property, which is a dictionary, you can store instances of objects to ensure that they are created once for the request. You can control the output stream applying your custom filters.

This is a short list of that what you can do with this property.

Answer 2

It's a way to get access to the current HttpContext someplace that may not have a reference to the context but is within an active web request.