In global.asax:
protected void Application_BeginRequest(Object sender, EventArgs e)
{
HttpRuntimeSection runTime = (HttpRuntimeSection)WebConfigurationManager.GetSection("system.web/httpRuntime");
//Approx 100 Kb(for page content) size has been deducted because the maxRequestLength proprty is the page size, not only the file upload size
int maxRequestLength = (runTime.MaxRequestLength - 100) * 1024;
//This code is used to check the request length of the page and if the request length is greater than
//MaxRequestLength then retrun to the same page with extra query string value action=exception
HttpContext context = ((HttpApplication)sender).Context;
if(context.Request.ContentLength > maxRequestLength)
{
IServiceProvider provider = (IServiceProvider)context;
HttpWorkerRequest workerRequest = (HttpWorkerRequest)provider.GetService(typeof(HttpWorkerRequest));
// Check if body contains data
if(workerRequest.HasEntityBody())
{
// get the total body length
int requestLength = workerRequest.GetTotalEntityBodyLength();
// Get the initial bytes loaded
int initialBytes = 0;
if(workerRequest.GetPreloadedEntityBody() != null)
initialBytes = workerRequest.GetPreloadedEntityBody().Length;
if(!workerRequest.IsEntireEntityBodyIsPreloaded())
{
byte[] buffer = new byte[512000];
// Set the received bytes to initial bytes before start reading
int receivedBytes = initialBytes;
while(requestLength - receivedBytes >= initialBytes)
{
// Read another set of bytes
initialBytes = workerRequest.ReadEntityBody(buffer, buffer.Length);
// Update the received bytes
receivedBytes += initialBytes;
}
initialBytes = workerRequest.ReadEntityBody(buffer, requestLength - receivedBytes);
}
}
// Redirect the user to the same page with querystring action=exception.
context.Response.Redirect("~/Erros/FicheiroGrande.aspx");
}
}
Source