c# Background worker class

Question

I want to put this method into background worker class, i am trying but stuck, can any one help me how to run this method into background worker class:
I am calling this method into my asp.net page, where file are zipped on server and then returend to the client. but zipping of file may take longer and user will see a busy screen, so to avoid that i want to use background worker class:

[Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.ReadWrite)]
public string Zip(string f, bool original)
{
    string zip = "";
    try
    {
        files = HttpContext.Current.Server.UrlDecode(files);
        string[] fileCollection = files.Split('*');
        zipFile = class1.zipfile(fileCollection, IsOriginal);

        int fileLength = files.Length;
    }
    catch (Exception ex)
    {
        Console.WriteLine("Exception during processing {0}", ex);
   }
    return File;
}

Answer 1

It seems your problem is returning the value from the BackgroundWorker. That can be done like this:

In the worker's DoWork method, set the e.Result to what you want to return:

private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
{   
    ...
    e.Result = File;
}

Then, in the RunWorkerCompleted method, you can access this value in the main thread:

private void backgroundWorker1_RunWorkerCompleted( object sender, RunWorkerCompletedEventArgs e)
{
    string result = e.Result as string;
}

I have assumed that File is string here, but you can cast it to your required object.

Why you need it in a web application I have no clue, but this is how to do it at least ;)