You may not realize it, but there is a limit to the size of a file that can be uploaded using this technique. By default, the maximum size of a file to be uploaded to the server using the File Field control is around 4MB. You cannot upload anything that is larger than this limit.
One of the great things about .NET, however, is that it usually provides a way around limitations. You can usually change the default settings that are in place. To change this size limit, you make some changes in either the machine.config
or web.config
file.
In the machine.config
file, find a node called <httpRuntime>
that looks like the following:
<httpRuntime
executionTimeout="90"
maxRequestLength="4096"
useFullyQualifiedRedirectUrl="false"
minFreeThreads="8"
minLocalRequestFreeThreads="4"
appRequestQueueLimit="100"
/>
A lot is going on in this single node, but the setting that takes care of the size of the files to be uploaded is the maxRequestLength
attribute. By default, this is set to 4096 kilobytes (KB). Simply change this value to increase the size of the files that you can upload to the server. If you want to allow 10 megabyte (MB) files to be uploaded to the server, set the maxRequestLength
value to 11264
, meaning that the application allows files that are up to 11000 KB to be uploaded to the server.
Making this change in the machine.config
file applies this setting to all the applications that are on the server. If you want to apply this to only the application you are working with, then apply this node to the web.config
file of your application, overriding any setting that is in the machine.config
file. Make sure this node resides between the <system.web>
nodes in the configuration file.
Another setting involved in the size limitation of files to be uploaded is the value given to the executionTimeout
attribute in the <httpRuntime>
node.
The value given the executionTimeout
attribute is the number of seconds the upload is allowed to occur before being shut down by ASP.NET. If you are going to allow large files to be uploaded to the server, you are also going to want to increase this value along with the maxRequestLength
value.
One negative with increasing the size of a file that can be uploaded is that there are hackers out there who attack servers by throwing a large number of requests at them. To guard against this, you can actually decrease the size of the files that are allowed to be uploaded; otherwise, you may find hundreds or even thousands of 10 MB requests hitting your server.
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