Application Insights Intrumentation Key in Web.config

When using Azure Application Insights in ASP.Net application, by default, Visual Studio insert IntrumentationKey in ApplicationInsights.config.

To allow multiple environments tracking, move IntrumentationKey to Web.config by following this steps:

  1. Remove IntrumentationKey from ApplicationInsights.config. If you have MVC application, don’t forget to modify ApplicationInsights’ script (usually in View\Shared\_Layout.cshtml), replace:

    {instrumentationKey:"your instrumentation key"}
    

    with:

    {instrumentationKey:"@Microsoft.ApplicationInsights.Extensibility.TelemetryConfiguration.Active.InstrumentationKey"}
    
  2. Add new app settings for IntrumentationKey in Web.config under <appSettings>

    <add key="InstrumentationKey" value="your instrumentation key" />
    
  3. In Global.asax.cs, Application_Start() method, add:

    Microsoft.ApplicationInsights.Extensibility.TelemetryConfiguration.Active.InstrumentationKey = System.Web.Configuration.WebConfigurationManager.AppSettings["InstrumentationKey"];
    

That’s it for the configuration changes. Everything else is the same including tracking custom event or page view.
With this configuration, you will be able to define InstrumentationKey in Release management for each environments.

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