Fix duplicate code snippet label and add connection string example in azure-messaging-eventhubs README

sdk/eventhubs/azure-messaging-eventhubs/README.md

@@ -117,14 +117,12 @@ Both the asynchronous and synchronous Event Hub producer and consumer clients ca
 
 The snippet below creates a synchronous Event Hub producer.
 
-```java com.azure.messaging.eventhubs.eventhubproducerclient.construct
-TokenCredential credential = new DefaultAzureCredentialBuilder().build();
+```java com.azure.messaging.eventhubs.eventhubproducerclient.connectionstring
+String connectionString = "Endpoint={endpoint};SharedAccessKeyName={sharedAccessKeyName};"
+    + "SharedAccessKey={sharedAccessKey};EntityPath={eventHubName}";
 
-// "<<fully-qualified-namespace>>" will look similar to "{your-namespace}.servicebus.windows.net"
-// "<<event-hub-name>>" will be the name of the Event Hub instance you created inside the Event Hubs namespace.
 EventHubProducerClient producer = new EventHubClientBuilder()
-    .credential("<<fully-qualified-namespace>>", "<<event-hub-name>>",
-        credential)
+    .connectionString(connectionString)
     .buildProducerClient();
 ```
 

sdk/eventhubs/azure-messaging-eventhubs/src/samples/java/com/azure/messaging/eventhubs/EventHubsJavaDocCodeSamples.java

@@ -60,6 +60,20 @@ public void createProducer() {
         // END: com.azure.messaging.eventhubs.eventhubproducerclient.construct
     }
 
+    /**
+     * Code sample for creating a synchronous Event Hub producer using a connection string.
+     */
+    public void createProducerWithConnectionString() {
+        // BEGIN: com.azure.messaging.eventhubs.eventhubproducerclient.connectionstring
+        String connectionString = "Endpoint={endpoint};SharedAccessKeyName={sharedAccessKeyName};"
+            + "SharedAccessKey={sharedAccessKey};EntityPath={eventHubName}";
+
+        EventHubProducerClient producer = new EventHubClientBuilder()
+            .connectionString(connectionString)
+            .buildProducerClient();
+        // END: com.azure.messaging.eventhubs.eventhubproducerclient.connectionstring
+    }
+
     /**
      * Code sample for creating an async Event Hub producer.
      */