new samples

PacticeSolution/MVVMComboBoxSample/ViewModel/StudentViewModel.cs

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+using MVVMComboBoxSample.Model;
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MVVMComboBoxSample.ViewModel
+{
+    internal class StudentViewModel
+    {
+        public ObservableCollection<Student> Students { get; set; }
+
+        public Student SelectedStudent { get; set; }
+
+        public StudentViewModel()
+        {
+            this.Students = new ObservableCollection<Student>()
+            {
+                new Student() { ID = Guid.NewGuid().ToString(), Name = "Joe", Age = 20 },
+                new Student() { ID = Guid.NewGuid().ToString(), Name = "Jane", Age = 21 },
+                new Student() { ID = Guid.NewGuid().ToString(), Name = "Rick", Age = 22 },
+                new Student() { ID = Guid.NewGuid().ToString(), Name = "Paul", Age = 23 },
+            };
+        }
+    }
+}