Adding more edits to match tutorial changes

Samples/MNIST/UWP/cs/MainPage.xaml.cs

@@ -9,14 +9,15 @@ using Windows.UI.Xaml.Media.Imaging;
 using Windows.AI.MachineLearning;
 using Windows.Media;
 using Windows.Storage.Streams;
+using System.Threading.Tasks;
 
 namespace MNIST_Demo
 {
     public sealed partial class MainPage : Page
     {
-        private mnistModel modelGen = new mnistModel();
+        private mnistModel modelGen;
         private mnistInput mnistInput = new mnistInput();
-        private mnistOutput mnistOutput = new mnistOutput();
+        private mnistOutput mnistOutput;
         //private LearningModelSession    session;
         private Helper helper = new Helper();
         RenderTargetBitmap renderBitmap = new RenderTargetBitmap();
@@ -39,7 +40,7 @@ namespace MNIST_Demo
             LoadModel();
         }
 
-        private async void LoadModel()
+        private async Task LoadModelAsync()
         {
             //Load a machine learning model
             StorageFile modelFile = await StorageFile.GetFileFromApplicationUriAsync(new Uri($"ms-appx:///Assets/mnist.onnx"));
@@ -56,11 +57,11 @@ namespace MNIST_Demo
             mnistOutput = await modelGen.EvaluateAsync(mnistInput);
 
             //Convert output to datatype
-            IReadOnlyList<float> VectorImage = mnistOutput.Plus214_Output_0.GetAsVectorView();
-            IList<float> ImageList = VectorImage.ToList();
+            IReadOnlyList<float> vectorImage = mnistOutput.Plus214_Output_0.GetAsVectorView();
+            IList<float> imageList = vectorImage.ToList();
 
             //LINQ query to check for highest probability digit
-            var maxIndex = ImageList.IndexOf(ImageList.Max());
+            var maxIndex = imageList.IndexOf(imageList.Max());
 
             //Display the results
             numberLabel.Text = maxIndex.ToString();