Friend Prabu,
As per default limit size is 4MB. you can change size as you required in WEB.CONFIG file.
<configuration>
<system.web>
<httpruntime maxmessagelength="?????">
executionTimeoutInSeconds="???"/>
</httpruntime></system.web>
</configuration>
You just write your required value as per your program in place of ? and run and check you will get it done of your task.
Let me know if you have any further query.
Please, go through above suggestion.
If its your answer, please mark as solution.
Best of luck for hunting solutions.
Thank you.
Regards,
Manoj Kalla