Fix dotnet error and clarify instructions

Author: dominicbetts

articles/iot-hub/quickstart-control-device-dotnet.md

@@ -63,13 +63,15 @@ A device must be registered with your IoT hub before it can connect. In this qui
 
     ```azurecli-interactive
     az extension add --name azure-cli-iot-ext
-    az iot hub device-identity create --hub-name {YourIoTHubName}--device-id MyDotnetDevice
+    az iot hub device-identity create --hub-name {YourIoTHubName} --device-id MyDotnetDevice
     ```
 
+    If you choose a different name for your device, update the device name in the sample applications before you run them.
+
 1. Run the following command to get the _device connection string_ for the device you just registered:
 
     ```azurecli-interactive
-    az iot hub device-identity show-connection-string --hub-name {YourIoTHubName} --device-id MyJavaDevice --output table
+    az iot hub device-identity show-connection-string --hub-name {YourIoTHubName} --device-id MyDotnetDevice --output table
     ```
 
     Make a note of the device connection string, which looks like `Hostname=...=`. You use this value later in the quickstart.

articles/iot-hub/quickstart-control-device-java.md

@@ -71,9 +71,11 @@ A device must be registered with your IoT hub before it can connect. In this qui
 
     ```azurecli-interactive
     az extension add --name azure-cli-iot-ext
-    az iot hub device-identity create --hub-name {YourIoTHubName}--device-id MyJavaDevice
+    az iot hub device-identity create --hub-name {YourIoTHubName} --device-id MyJavaDevice
     ```
 
+    If you choose a different name for your device, update the device name in the sample applications before you run them.
+
 1. Run the following command to get the _device connection string_ for the device you just registered:
 
     ```azurecli-interactive

articles/iot-hub/quickstart-control-device-node.md

@@ -63,9 +63,11 @@ A device must be registered with your IoT hub before it can connect. In this qui
 
     ```azurecli-interactive
     az extension add --name azure-cli-iot-ext
-    az iot hub device-identity create --hub-name {YourIoTHubName}--device-id MyNodeDevice
+    az iot hub device-identity create --hub-name {YourIoTHubName} --device-id MyNodeDevice
     ```
 
+    If you choose a different name for your device, update the device name in the sample applications before you run them.
+
 1. Run the following command to get the _device connection string_ for the device you just registered:
 
     ```azurecli-interactive

articles/iot-hub/quickstart-control-device-python.md

@@ -67,9 +67,11 @@ A device must be registered with your IoT hub before it can connect. In this qui
 
     ```azurecli-interactive
     az extension add --name azure-cli-iot-ext
-    az iot hub device-identity create --hub-name {YourIoTHubName}--device-id MyPythonDevice
+    az iot hub device-identity create --hub-name {YourIoTHubName} --device-id MyPythonDevice
     ```
 
+    If you choose a different name for your device, update the device name in the sample applications before you run them.
+
 1. Run the following command to get the _device connection string_ for the device you just registered:
 
     ```azurecli-interactive

articles/iot-hub/quickstart-send-telemetry-dotnet.md

@@ -56,13 +56,15 @@ A device must be registered with your IoT hub before it can connect. In this qui
 
     ```azurecli-interactive
     az extension add --name azure-cli-iot-ext
-    az iot hub device-identity create --hub-name {YourIoTHubName}--device-id MyDotnetDevice
+    az iot hub device-identity create --hub-name {YourIoTHubName} --device-id MyDotnetDevice
     ```
 
+    If you choose a different name for your device, update the device name in the sample applications before you run them.
+
 1. Run the following command to get the _device connection string_ for the device you just registered:
 
     ```azurecli-interactive
-    az iot hub device-identity show-connection-string --hub-name {YourIoTHubName} --device-id MyJavaDevice --output table
+    az iot hub device-identity show-connection-string --hub-name {YourIoTHubName} --device-id MyDotnetDevice --output table
     ```
 
     Make a note of the device connection string, which looks like `Hostname=...=`. You use this value later in the quickstart.

articles/iot-hub/quickstart-send-telemetry-ios.md

@@ -79,6 +79,8 @@ A device must be registered with your IoT hub before it can connect. In this qui
    az iot hub device-identity create --hub-name {YourIoTHubName} --device-id myiOSdevice
    ```
 
+    If you choose a different name for your device, update the device name in the sample applications before you run them.
+
 1. Run the following command to get the _device connection string_ for the device you just registered:
 
    ```azurecli-interactive

articles/iot-hub/quickstart-send-telemetry-java.md

@@ -64,9 +64,11 @@ A device must be registered with your IoT hub before it can connect. In this qui
 
     ```azurecli-interactive
     az extension add --name azure-cli-iot-ext
-    az iot hub device-identity create --hub-name {YourIoTHubName}--device-id MyJavaDevice
+    az iot hub device-identity create --hub-name {YourIoTHubName} --device-id MyJavaDevice
     ```
 
+    If you choose a different name for your device, update the device name in the sample applications before you run them.
+
 1. Run the following command to get the _device connection string_ for the device you just registered:
 
     ```azurecli-interactive

articles/iot-hub/quickstart-send-telemetry-node.md

@@ -56,9 +56,11 @@ A device must be registered with your IoT hub before it can connect. In this qui
 
     ```azurecli-interactive
     az extension add --name azure-cli-iot-ext
-    az iot hub device-identity create --hub-name {YourIoTHubName}--device-id MyNodeDevice
+    az iot hub device-identity create --hub-name {YourIoTHubName} --device-id MyNodeDevice
     ```
 
+    If you choose a different name for your device, update the device name in the sample applications before you run them.
+
 1. Run the following command to get the _device connection string_ for the device you just registered:
 
     ```azurecli-interactive

articles/iot-hub/quickstart-send-telemetry-python.md

@@ -74,9 +74,11 @@ A device must be registered with your IoT hub before it can connect. In this qui
 
     ```azurecli-interactive
     az extension add --name azure-cli-iot-ext
-    az iot hub device-identity create --hub-name {YourIoTHubName}--device-id MyPythonDevice
+    az iot hub device-identity create --hub-name {YourIoTHubName} --device-id MyPythonDevice
     ```
 
+    If you choose a different name for your device, update the device name in the sample application before you run it.
+
 1. Run the following command to get the _device connection string_ for the device you just registered:
 
     ```azurecli-interactive