Disable sending telemetry data in DotNet

Recently i am working with an open source application which built using DotNet (C#), but while i watching some data flow outside using command netstat the DotNet is make connection outside, then when i figure it out it's belong to azure's in singapore.

Then i do some search in google then what i'm found is DotNet is sending telemetry data then for disable it by set an environment variable

export DOTNET_CLI_TELEMETRY_OPTOUT=1

For set permanently you may add it in /etc/profile, After that it disable sending telemetry data.