If you are not using Glimpse to debugging and profiling ASP.NET web application then you are missing out on very useful stuff I must say.

Not using glimpse - Oh No

This NuGet package brings many handy information about your ASP.NET MVC application, which in turn can be useful and quick help to dig state and performance issues in your application.

Advantage of adapting Glimpse is that, it can be used in production environment where it can be enabled or visible based on your custom configuration / conditon. Thus gives you power to analyse your production state without compromising or hindering your environment rules and constraints.

You can install Glimpse from NuGet into your ASP.NET MVC application with Install-Package Glimpse.Mvc5 (because I am using MVC5 for this example).

Install Glimple from NuGet

This installs three packages:

If you are using other version of MVC you can install Glimpse targeting your MVC version.

Official site for Glimpse project - Free, open source and built by the community with love.

When you install Glimpse into your MVC project, it adds minimal configuration required to your Web.Config file.

Definition for custom configuration node glimpse:

<configSections>
    <section name="glimpse" type="Glimpse.Core.Configuration.Section, Glimpse.Core" />
</configSections>

Define HTTP module and HTTP handler in system.web node:

<httpModules>
    <add name="Glimpse" type="Glimpse.AspNet.HttpModule, Glimpse.AspNet" />
</httpModules>
<httpHandlers>
    <add path="glimpse.axd" verb="GET" type="Glimpse.AspNet.HttpHandler, Glimpse.AspNet" />
</httpHandlers>

Register HTTP module and HTTP handler in system.webserver node:

<system.webServer>
    <modules>
        <add name="Glimpse" type="Glimpse.AspNet.HttpModule, Glimpse.AspNet" preCondition="integratedMode" />
    </modules>
    <handlers>
        <add name="Glimpse" path="glimpse.axd" verb="GET" type="Glimpse.AspNet.HttpHandler, Glimpse.AspNet" preCondition="integratedMode" />
    </handlers>
</system.webServer>

Add glimpse node at the end which can be used to configure Glimpse behavior as per your needs:

<glimpse defaultRuntimePolicy="On" endpointBaseUri="~/Glimpse.axd">
</glimpse>

After adding Glimpse to your project when you run your application. By default Glimpse plugin does not show up. This is disabled by default.
You can enable Glimpse by going to following URL: http://[your-url]/Glimpse.axd/ and click on "Turn Glimpse On".

Now when you navigate or open any URL of your web application you will see a blue bar at bottom right corner of your browser similar to this:

Glimpse loaded

This Glimpse bar gives you summary of the profiling data captured for the current request you made. When you hover over the HTTP part of the summary bar then it would expand that area to show further more details.

Glimpse HTTP summary

If you hover over the HOST part of the summary bar then it display more information for that section

Glimpse HOST summary

When you click on the G icon at the bottom - right corner (which looks very similar to icon of Google for some reason) then it will open up view with tabs that gives your complete debugging and profiling details. This view looks very similar to the browser developer tool (F12) but showing information for different aspects of things happening on the server side.

Glimpse - Detail TABS

Two tabs I feel are very informative and useful in terms of performance tuning are:

Glimpse Execution Tab:

Glimpse Execution Tab

Glimpse Timeline Tab:

Glimpse Timeline Tab

Each tabs are default extensions that came with the Glimpse MVC 5 NuGet package. But are not restricted to these tabs only. Glimpse core is very extensible in the way you can use. There are plenty of extensions available developed by Glimpse team and community to debug and profile different aspects of any web application.

For example: Glimpse Extension for Entity Framework, SignalR, AutoFac to name a few.

Full list of Glimpse Extension can be found here. Also you can develop your own Glimpse extension (Custom Tab) and share with the community.

The Glimpse configuration can be controlled in glimpse node - Web.Config or via Code - learn how to.

Say hi and connect with founders of Glimpse - Anthony van der Hoorn (@anthony_vdh) and Nik Molnar (@nikmd23), thank you guys for Glimpse.

To conclude, I highly recommend to get started with Glimpse and start using it for creating beautiful and fast web application on ASP.NET stack.

Happy Coding!!