Reverting removal of the snippet files. (#2835)

Author: benrr101

doc/samples/AADAuthenticationCustomDeviceFlowCallback.cs

@@ -0,0 +1,30 @@
+//<Snippet1>
+using System;
+using System.Threading.Tasks;
+using Microsoft.Identity.Client;
+using Microsoft.Data.SqlClient;
+
+namespace CustomAuthenticationProviderExamples
+{
+    public class Program
+    {
+        public static void Main()
+        {
+            SqlAuthenticationProvider authProvider = new ActiveDirectoryAuthenticationProvider(CustomDeviceFlowCallback);
+            SqlAuthenticationProvider.SetProvider(SqlAuthenticationMethod.ActiveDirectoryDeviceCodeFlow, authProvider);
+            using (SqlConnection sqlConnection = new SqlConnection("Server=<myserver>.database.windows.net;Authentication=Active Directory Device Code Flow;Database=<db>;"))
+            {
+                sqlConnection.Open();
+                Console.WriteLine("Connected successfully!");
+            }
+        }
+
+        private static Task CustomDeviceFlowCallback(DeviceCodeResult result)
+        {
+            // Provide custom logic to process result information and read device code.
+            Console.WriteLine(result.Message);
+            return Task.FromResult(0);
+        }
+    }
+}
+//</Snippet1>

doc/samples/ApplicationClientIdAzureAuthenticationProvider.cs

@@ -0,0 +1,26 @@
+//<Snippet1>
+using System;
+using Microsoft.Data.SqlClient;
+
+namespace CustomAuthenticationProviderExamples
+{
+    public class Program
+    {
+        public static void Main()
+        {
+            // Supported for all authentication modes supported by ActiveDirectoryAuthenticationProvider
+            ActiveDirectoryAuthenticationProvider provider = new ActiveDirectoryAuthenticationProvider("<application_client_id>");
+            if (provider.IsSupported(SqlAuthenticationMethod.ActiveDirectoryInteractive))
+            {
+                SqlAuthenticationProvider.SetProvider(SqlAuthenticationMethod.ActiveDirectoryInteractive, provider);
+            }
+            
+            using (SqlConnection sqlConnection = new SqlConnection("Server=<myserver>.database.windows.net;Authentication=Active Directory Interactive;Database=<db>;"))
+            {
+                sqlConnection.Open();
+                Console.WriteLine("Connected successfully!");
+            }
+        }
+    }
+}
+//</Snippet1>

doc/samples/CustomDeviceCodeFlowAzureAuthenticationProvider.cs

@@ -0,0 +1,57 @@
+//<Snippet1>
+using System;
+using System.Threading.Tasks;
+using Microsoft.Identity.Client;
+using Microsoft.Data.SqlClient;
+
+namespace CustomAuthenticationProviderExamples
+{
+    /// <summary>
+    /// Example demonstrating creating a custom device code flow authentication provider and attaching it to the driver.
+    /// This is helpful for applications that wish to override the Callback for the Device Code Result implemented by the SqlClient driver.
+    /// </summary>
+    public class CustomDeviceCodeFlowAzureAuthenticationProvider : SqlAuthenticationProvider
+    {
+        public override async Task<SqlAuthenticationToken> AcquireTokenAsync(SqlAuthenticationParameters parameters)
+        {
+            string clientId = "my-client-id";
+            string clientName = "My Application Name";
+            string s_defaultScopeSuffix = "/.default";
+
+            string[] scopes = new string[] { parameters.Resource.EndsWith(s_defaultScopeSuffix) ? parameters.Resource : parameters.Resource + s_defaultScopeSuffix };
+
+            IPublicClientApplication app = PublicClientApplicationBuilder.Create(clientId)
+                .WithAuthority(parameters.Authority)
+                .WithClientName(clientName)
+                .WithRedirectUri("https://login.microsoftonline.com/common/oauth2/nativeclient")
+                .Build();
+
+            AuthenticationResult result = await app.AcquireTokenWithDeviceCode(scopes,
+                    deviceCodeResult => CustomDeviceFlowCallback(deviceCodeResult)).ExecuteAsync();
+            return new SqlAuthenticationToken(result.AccessToken, result.ExpiresOn);
+        }
+
+        public override bool IsSupported(SqlAuthenticationMethod authenticationMethod) => authenticationMethod.Equals(SqlAuthenticationMethod.ActiveDirectoryDeviceCodeFlow);
+
+        private Task CustomDeviceFlowCallback(DeviceCodeResult result)
+        {
+            Console.WriteLine(result.Message);
+            return Task.FromResult(0);
+        }
+    }
+
+    public class Program
+    {
+        public static void Main()
+        {
+            // Register our custom authentication provider class to override Active Directory Device Code Flow
+            SqlAuthenticationProvider.SetProvider(SqlAuthenticationMethod.ActiveDirectoryDeviceCodeFlow, new CustomDeviceCodeFlowAzureAuthenticationProvider());
+            using (SqlConnection sqlConnection = new SqlConnection("Server=<myserver>.database.windows.net;Authentication=Active Directory Device Code Flow;Database=<db>;"))
+            {
+                sqlConnection.Open();
+                Console.WriteLine("Connected successfully!");
+            }
+        }
+    }
+}
+//</Snippet1>