System.Web.HttpException: Request timed out

 Server Error in '/' Application. Request timed out. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Request timed out.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[HttpException (0x80004005): Request timed out.]

To solve the timeout issue we can specify the request timeout (in seconds) in the web.config, like this:

<httpRuntime executionTimeout="300" />

For context, here's a complete web.config with just this setting:

<configuration>
    <system.web>
        <httpRuntime executionTimeout="300" />
    </system.web>

</configuration> 

Also you can Open IIS -> click on the your siteName -> configuration Editor on the Section, scroll to system.web/httpRuntime. Increase the executionTimeout to the time you think it will take to execute your process.