A number of configuration settings become very relevant when
performing uploads. These can be changed by adding sections or
values into the Web.Config file. A typical configuration section is
Version=220.127.116.11, Culture=neutral, PublicKeyToken=572826f585f78c3a"
The Progress Module is required for the Pure HTML Progress Bar,
for GigUpload and for Corruption Autofix functionality. The
Progress Module is a .NET HTTP Module designed to intercept page
requests and preprocess them before passing them on to ASP.NET.
To integrate the Progress Module into your ASP.NET application
you need to add it using a line in the httpModules subsection of
the web.config file. This is shown in the example web.config file
To integrate and use ABCUpload objects into your ASP.NET
application you need to add a reference to the assembly (stored in
the GAC) using a line in the compilation subsection of the
web.config file. This is shown in the example web.config file
This attribute is used to limit the size of uploads by rejecting
any which exceed a certain limit. The limit refers to the total
size of the HTTP upload in KB (approximately equal to the sum of
all the files being upload). You should set a sensible limit here
to stop malicious visitors using up your bandwidth by uploading
excessively large files.
If the size of an upload is too great the server will refuse to
accept it. Because the server is refusing the request the uploading
browser will report that the submission page is not available. This
is a client side error message rather than a server side error
message and it means that you cannot normally provide a sensible
error message to users if they submit files which are too
However using ABCUpload you can report back a sensible error
message via a progress window. If you believe that visitors may
attempt to perform uploads greater than the maximum you should use
the progress bar and the note on the progress window will inform
your visitor why their upload has been rejected.
In the example web.config file above the maxRequestLength is set
to 1 GB.
The execution time-out refers to the number of seconds an
ASP.NET page is given before the operation is assumed to have
failed and the page terminated. If you are uploading a large file
the code that is receiving the transfer may time out before the
file has been completely uploaded.
In the example web.config file above the executionTimeout is set
to one hour.
The session time-out refers to the number of minutes before the
user session is aborted. If a large file is being uploaded it is
desirable to maintain the session state. The session time-out
should always be longer than the amount of time you expect uploads
to take. Note that this value is only relevant if you have session
In the example web.config file above the sessionState is set to
The responseDeadlockInterval is specified in the machine.config
file and defaults to three minutes. It specifies the time interval
after which the process will be restarted if no responses have been
made and requests are still queued.
Under ASP.NET requests that take longer than the deadlock
interval can cause problems under some very specific circumstances.
Sometimes a client may make multiple page requests which ASP.NET
may queue one after the other. If the first request in the queue
takes longer than the deadlock interval then ASP.NET will
mistakenly assume the whole process is deadlocked and restart it.
These types of situation are very unusual and are more commonly
encountered in test environments than real world ones.
For this situation to arise a client must make multiple uploads
simultaneously. At least two uploads must take longer than the
timeout. The client must make other page requests at the same time
which IIS must decide to queue (whether it decides to queue them or
not depends on whether IIS thinks they form part of the same
session). These queued requests must not time out or be dismissed
on the client side. Neither the client nor any other visitors must
make other aspx page requests during this time.