Problem with file upload element

That's because By default asp.net allows u to upload a file of maximum size 4096kb.

u need to do changes in your web.config

add

<httpruntime></httpruntime>

node in web.config

and set maxRequestLength to whatever the max size of the file you need to upload in bytes.

<httpruntime maxrequestlenght="8192" executiontimeout="400" />

maxRequestLenght is the max size of the file u want to upload.

this should do the trick for you However it's a good practice if u upload your large file by dividing it into pieces and joining the pieces at server.

To change this size limit, you make some changes in either the web.config.comments (found in the ASP.NET 2.0 configuration folder at C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG) or your application's web.config file.

In the web.config.comments file, find a node called <httpRuntime> that looks like the following:
Copy

<httpRuntime
 executionTimeout="110"
 maxRequestLength="4096"
 requestLengthDiskThreshold="80"
 useFullyQualifiedRedirectUrl="false"
 minFreeThreads="8"
 minLocalRequestFreeThreads="4"
 appRequestQueueLimit="5000"
 enableKernelOutputCache="true"
 enableVersionHeader="true"
 requireRootedSaveAsPath="true"
 enable="true"
 shutdownTimeout="90"
 delayNotificationTimeout="5"
 waitChangeNotification="0"
 maxWaitChangeNotification="0"
 enableHeaderChecking="true"
 sendCacheControlHeader="true"
 apartmentThreading="false" />

You can increase the limit of length of uploaded file by using the following code into your web.config file in your website.
You have to add this tag after the system.web of your web.config file...

<httpruntime maxrequestlength="20480" executiontimeout="600">
</httpruntime>

Using that code you can upload files which are more than 20MB in size.
I hope it will help you. :)