To apply limit settings for all the applications on server we can use web.config.comments configuration file in C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG

default for IIS server is 30 mb and we can reset this in web.config as mentioned below

 <system.webServer>

     <security>

        <requestFiltering>

            <requestLimits maxAllowedContentLength="512000"/>

          </requestFiltering>

        </security>

 </system.webServer>

we can reset this limit in web.config to enable larger file uploads

<system.web>

         <httpRuntime executionTimeout="3600" maxRequestLength="512000"/>

</system.web>

this will allow files upto 500 mb to be uploaded.

    <location path="DirectoryToUploadFiles">

    <system.web>

    <httpRuntime executionTimeout="3600" maxRequestLength="512000"/>

     </system.web>

    </location>