Redirect to Error Page When Maximum Request Length is Exceeded [FileUpload]

How many times you tried to catch the maximum request length error thrown by the FileUplad control if the web.config HttpRuntime entry is not modified?
In this blog post, Haissam Abdul Malak will create an HttpModule which check if the file is larger than 4 MB to redirect the user to a webform "Error.aspx".
The module will register to the BeginRequest event to execute the needed code


Below is the implementation

using System;
using System.Collections.Generic;
using System.Text;
using System.Web;


namespace HAMModule
{
public class MyModule : IHttpModule
{
public void Init(HttpApplication app)
{
app.BeginRequest += new EventHandler(app_BeginRequest);

}
void app_BeginRequest(object sender, EventArgs e)
{
HttpContext context = ((HttpApplication)sender).Context;

if (context.Request.ContentLength > 4096000)
{
IServiceProvider provider = (IServiceProvider)context;
HttpWorkerRequest wr = (HttpWorkerRequest)provider.GetService(typeof(HttpWorkerRequest));

// Check if body contains data
if (wr.HasEntityBody())
{
// get the total body length
int requestLength = wr.GetTotalEntityBodyLength();
// Get the initial bytes loaded
int initialBytes = wr.GetPreloadedEntityBody().Length;

if (!wr.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 = wr.ReadEntityBody(buffer, buffer.Length);
// Update the received bytes
receivedBytes += initialBytes;
}
initialBytes = wr.ReadEntityBody(buffer, requestLength - receivedBytes);

}
}
// Redirect the user to an error page.
context.Response.Redirect("Error.aspx");
}

}
public void Dispose()
{
}
}
}

Now all you need to do is to add the module in the web.config file by adding the below entry under system.Web





Hope this helps,