FileUploadModule

FileUploadModule.cs

public class FileUploadModule : IHttpModule
{
    private const int _maxUploadSize = 1337;

    public void Init(HttpApplication context)
    {
        context.BeginRequest += handleBeginRequest;
    }

    private void handleBeginRequest(object sender, EventArgs e)
    {
        var app = sender as HttpApplication;
        var hasBigFiles = app.Request.Files.OfType<HttpPostedFile>()
            .Any(f => f.ContentLength > _maxUploadSize);

        if (hasBigFiles)
        {
            app.Response.StatusCode = 413;
            app.Response.StatusDescription = "Request too large, squeeze it a bit more and try again!";
            app.Response.End();
            app.CompleteRequest();
        }
    }
}