VM Defaulting Size warning improved (#15407)

* size warning improve

* changelog

Author: Sandido

src/Compute/Compute/ChangeLog.md

@@ -20,6 +20,7 @@
 
 -->
 ## Upcoming Release
+* Fixed the warning in `New-AzVM` cmdlet stating the sku of the VM is being defaulted even if a sku size is provided by the user. Now it only occurs when the user does not provide a sku size.
 
 ## Version 4.15.0
 * Added optional parameter `-OrchestrationMode` to `New-AzVmss` and `New-AzVmssConfig`

src/Compute/Compute/VirtualMachine/Operation/NewAzureVMCommand.cs

@@ -485,7 +485,7 @@ async Task StrategyExecuteCmdletAsync(IAsyncCmdlet asyncCmdlet)
             var parameters = new Parameters(this, client, resourceClient);
 
             // Information message if the default Size value is used. 
-            if (!this.IsBound(Size))
+            if (!this.IsParameterBound(c => c.Size))
             {
                 WriteInformation("No Size value has been provided. The VM will be created with the default size Standard_D2s_v3.", new string[] { "PSHOST" });
             }