Hi joegreen2005,

you can try to use code like below.

TelemetryConfiguration.Active.DisableTelemetry = true;

or add code below in ApplicationInsights.Debug.config file.

<Content Include="ApplicationInsights.config" />
<None Include="ApplicationInsights.Debug.config">
  <DependentUpon>ApplicationInsights.config</DependentUpon>
</None>
<None Include="ApplicationInsights.Release.config">
  <DependentUpon>ApplicationInsights.config</DependentUpon>
</None>1234567

you can visit link below to get detailed information.

How to disable the Application Insights while in Debug ?

Turn off Application Insights for your dev environment

Regards

Deepak