How can I upload large files as attachment in ASP.NET environment ?

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I am using asp:FileUpload control for file attachment and asp:GridView for listing of attachments.

What I have tried:

While trying first file of 2MB is working fine and adding to the GridView list. But while trying for another 2MB file, the browser showing an error
as :

Aw, Snap!
Google Chrome ran out of memory while trying to display this webpage.

In the web.config file I have set

<system.web>
<httpRuntime targetFramework="4.5" maxRequestLength="2097152" />


<system.webserver>
<security>
<requestfiltering>
<requestLimits maxAllowedContentLength="2147483648" />




Please suggest. Thanks in advance.