Custom commands to upload to TestFlight.

gistfile1.txt

Add these inside the Adhoc|iPhone block in your csproj and change the fields withing the square brackets [], so values that are relvant to your TestFlight account. 

<CustomCommands>
      <CustomCommands>
        <Command type="BeforeBuild" command="rm -rf ${ProjectDir}/bin/${ProjectConfigPlat}/${ProjectConfigName}/Payload/${ProjectName}.app/" />
        <Command type="BeforeBuild" command="rm -rf ${ProjectDir}/bin/${ProjectConfigPlat}/${ProjectConfigName}/${ProjectName}.ipa" />
        <Command type="AfterBuild" command="cp -r ${ProjectDir}/bin/${ProjectConfigPlat}/${ProjectConfigName}/${ProjectName}.app ${ProjectDir}/bin/${ProjectConfigPlat}/${ProjectConfigName}/Payload/${ProjectName}.app" />
        <Command type="AfterBuild" command="zip -r ${ProjectName}.ipa Payload/ -x &quot;*.DS_Store&quot;" workingdir="${ProjectDir}/bin/${ProjectConfigPlat}/${ProjectConfigName}/" />
        <Command type="AfterBuild" command="curl http://testflightapp.com/api/builds.json -F file=@${ProjectName}.ipa -F api_token='[API_TOKEN_HERE]' -F team_token='[TEAM_TOKEN_HERE]' -F notes='[TESTER_NOTES_HERE]' -F notify=true -F distribution_lists='[Test List Name Here]'" workingdir="${ProjectDir}/bin/${ProjectConfigPlat}/${ProjectConfigName}/" />
      </CustomCommands>
</CustomCommands>