Connecting to Dataverse using AuthCode flow and CrmServiceClient

Here a quick example of connecting to Dynamics using CrmServiceClient in Microsoft.CrmSdk.XrmTooling.CoreAssembly

	using Microsoft.Xrm.Sdk;
	using Microsoft.Xrm.Tooling.Connector;
	using System;
	namespace Codebug.Dataverse.Connection
	{
	/// <summary>
	/// Before running this application the following needs to be performed.
	/// 1. An application registration need to be created with a secret in azure.
	/// 2. In the API Permissions section in app registration in azure, Dynamics CRM > user_impersonation needs to be granted.
	/// 3. The application then need to be created as app user in dynamics.
	/// 4. A security role needs to be added to the user.
	/// No redirect uri needs to be set up.
	/// <seealso cref="https://docs.microsoft.com/en-us/powerapps/developer/data-platform/xrm-tooling/use-connection-strings-xrm-tooling-connect">Reference for connection string<seealso/>
	/// </summary>
	class Program
	{
	/// <summary>
	/// for this code to run install Microsoft.CrmSdk.XrmTooling.CoreAssembly from nuget org
	/// </summary>
	/// <param name="connectionString"></param>
	/// <remarks>Both CrmServiceClient and OrganizationWebProxyClient implements IOrganizationService
	/// OrganizationWebProxyClient is not disposable and should only be used if the code uses early bound classes. In that case we need
	/// OrganizationWebProxyClient to generate the context object. if your application uses late bound using disposable CrmServiceClient is sufficient</remarks>
	private static IOrganizationService Connect(string connectionString)
	{
	var crmClient = new CrmServiceClient(connectionString);
	return crmClient.OrganizationWebProxyClient != null
	? crmClient.OrganizationWebProxyClient as IOrganizationService
	: throw new Exception();
	}
	static void Main(string[] args)
	{
	var clientId = "<client id in Azure>";
	var secret = "<Secret in azure>";
	var dataVerseUrl = "Url for the dynamics 365/DataVerse instance";
	var connectionString = $"AuthType=ClientSecret;" + // more on https://docs.microsoft.com/en-us/powerapps/developer/data-platform/xrm-tooling/use-connection-strings-xrm-tooling-connect#connection-string-parameters
	$"url={dataVerseUrl};" +
	$"ClientId={clientId};" +
	$"ClientSecret={secret};" +
	$"RequireNewInstance=false;"; // Default is false. If set to true a new connection will be created every time CrmServiceClient is generated.
	var orgService = Connect(connectionString);
	}
	}
	}

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