Sample code to connect to CDS / Dynamics 365 / CE using OAuth

 Sample code for quick reference for connecting to CDS through a console application using OAuth

Add the NuGet package for Microsoft.CrmSdk.XrmTooling.CoreAssembly in the project.

Xrm.Tooling is the preferred way to connect to CDS, because of many benefits – we can define connection string, thread safety, support for X.509 certificate authentication, support for secure storage of sign-in credentials and reuse etc.

Note –

Here we will be using the sample AppId and Redirect URI.

Sample Code- 

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Tooling.Connector;
using System;
 
namespace SampleConsoleApp
{
class Program
{
static void Main(string[] args)
{
string ConnectionString = "AuthType = OAuth; " +
"Username = [username]@[domain].onmicrosoft.com;" +
"Password = [password]; " +
"Url = https://[orgname].crm.dynamics.com;" +
"AppId=51f81489-12ee-4a9e-aaae-a2591f45987d;" +
"RedirectUri=app://58145B91-0C36-4500-8554-080854F2AC97;" +
"LoginPrompt=Auto";
 
CrmServiceClient svc = new CrmServiceClient(ConnectionString);
 
if (svc.IsReady)
{
var myContact = new Entity("contact");
myContact.Attributes["lastname"] = "Test";
myContact.Attributes["firstname"] = "User1";
svc.Create(myContact);
}
}
}
}

For .NET Framework 4.5.2 – we need to explicitly specify Tls1.2 as the default protocol. 

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

.NET Framework 4.6.2 uses TLS 1.2 as the default protocol.