Add project files.

Views/MainWindow.xaml

@@ -0,0 +1,45 @@
+<Window x:Class="MVVM_DEMO.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:MVVM_DEMO"
+        xmlns:vm="clr-namespace:MVVM_DEMO.ViewModels"
+        mc:Ignorable="d"
+        Title="MainWindow"
+        Height="450"
+        Width="800">
+    <Window.DataContext>
+        <vm:MainViewModel />
+    </Window.DataContext>
+
+    <Grid>
+        <StackPanel>
+            <ComboBox x:Name="comboBox"
+                      Width="200"
+                      Height="30"
+                      Margin="10"
+                      VerticalAlignment="Top"
+                      ItemsSource="{Binding Products}"
+                      DisplayMemberPath="ProductName" />
+            <Button x:Name="btnAddProduct"
+                    Content="Add Product"
+                    Width="100px"
+                    Height="25px"
+                    Click="btnAddProduct_Click" />
+            <Label Content="Selected Product Details"
+                   FontWeight="Bold"
+                   FontSize="16"
+                   Margin="10" />
+            <TextBox x:Name="txtProductName"
+                     Width="200"
+                     Height="30"
+                     Text="{Binding productName}" 
+                     />
+            <TextBox x:Name="txtProductPrice"
+                     Width="200"
+                     Height="30"
+                     Text="{Binding productPrice}" />
+        </StackPanel>
+    </Grid>
+</Window>