C# - Loading A File From Page Methods?

I have a JavaScript function which calls a page method as follows:

function openFile(file) {
PageMethods.LoadFile(file);
}
[System.Web.Services.WebMethod]
public static void LoadFile(string fileName)
{
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.Buffer = true;
HttpContext.Current.Response.ContentType = "application/binary";
var filePath = @"C:MyFiles" + fileName;
HttpContext.Current.Response.AddHeader("Content-Disposition", string.Format("attachment;filename="{0}"", fileName));
HttpContext.Current.Response.WriteFile(filePath);
HttpContext.Current.Response.End();
}

The page method throws the following exception:

Microsoft JScript runtime error: Sys.Net.WebServiceFailedException: The server method 'LoadFile' failed with the following error: System.Threading.ThreadAbortException-- Thread was being aborted.