Call async methods with C#

Suppose you have the following method

public void UploadFile(string path)
{
	try
    {
        //... uploads the file to the server
    }
    catch(Exception ex)
    {
        // ... error handling
    }
}

Suppose you are using it in a web service, your requirement is to give an immediate response, but you also need to upload the file asynchronously (the file resides on the server) , the user won't consume it soon, he/she only needs the upload.

1) Declare a method delegate, eg:

public delegate void UploadFileDelegate(string path);

2) Invoke it properly

[WebMethod]
public bool GetFile(string path)
{
	try
	{
		UploadFileDelegate uid = UploadFile;
		IAsyncResult rsl = uid.BeginInvoke(path, null, null);
		return true;
	}
	catch(Exception ex)
	{
		return false;
	}
}

This will help you to launch a bunch of operations without being unresponsive, you can implement error notifications of course, you can poll, or wait for the procedure to complete at a certain point,  launch multithreaded tasks... and so on.