diff --git a/Day 2 Class Examples/example10/Program.cs b/Day 2 Class Examples/example10/Program.cs
new file mode 100644
index 0000000..b4294c3
--- /dev/null
+++ b/Day 2 Class Examples/example10/Program.cs	
@@ -0,0 +1,48 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace example10
+{
+    class Program
+    {
+        class EvenInt
+        {
+            int val = 0;
+
+            public delegate void CallbackFun(int newval, int oldval);
+            public event CallbackFun Changed;
+
+            public int Value
+            {
+                get { return val; }
+                set
+                {
+                    if (Changed != null)
+                        Changed(value, val);
+                    val = value;
+                }
+            }
+        }
+        static void Main(string[] args)
+        {
+            EvenInt num = new EvenInt();
+            num.Changed += new EvenInt.CallbackFun(num_Changed);
+            num.Changed += new EvenInt.CallbackFun(num_Changed2);
+
+            num.Value = 20;
+            num.Value += 10;
+        }
+
+        static void num_Changed2(int newval, int oldval)
+        {
+            Console.WriteLine("numchanged2");
+        }
+
+        static void num_Changed(int newval, int oldval)
+        {
+            Console.WriteLine("Changed from {0} to {1}", oldval, newval);
+        }
+    }
+}
diff --git a/Day 2 Class Examples/example11/Program.cs b/Day 2 Class Examples/example11/Program.cs
new file mode 100644
index 0000000..65d281f
--- /dev/null
+++ b/Day 2 Class Examples/example11/Program.cs	
@@ -0,0 +1,37 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace example11
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            int[] x = new int[10];
+            for (int i = 0; i < x.Length; i++)
+                x[i] = i;
+
+            foreach (int z in x)
+                Console.WriteLine(z);
+
+            List<int> lst1 = new List<int>();
+            for (int i = 0; i < 10; i++)
+                lst1.Add(i);
+
+            foreach (int z in lst1)
+                Console.WriteLine(z);
+
+            ArrayList al1 = new ArrayList();
+            for (int i = 0; i < 10; i++)
+                al1.Add(i);
+
+            foreach (int z in al1)
+                Console.WriteLine(z);
+
+            int w = (int)al1[0];
+        }
+    }
+}
diff --git a/Day 2 Class Examples/example12/Program.cs b/Day 2 Class Examples/example12/Program.cs
new file mode 100644
index 0000000..ea5d5ee
--- /dev/null
+++ b/Day 2 Class Examples/example12/Program.cs	
@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace example12
+{
+    class MyException : Exception
+    {
+        public MyException(string msg) : base(msg)
+        {
+            
+        }
+    }
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            //throw new Exception("this is a boring exception");
+            throw new MyException("this is a fun exception");
+        }
+    }
+}
diff --git a/Day 2 Class Examples/example6/Program.cs b/Day 2 Class Examples/example6/Program.cs
new file mode 100644
index 0000000..6334b30
--- /dev/null
+++ b/Day 2 Class Examples/example6/Program.cs	
@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace example6
+{
+    internal class PassTest
+    {
+        public PassTest(int x) { }
+        public List<int> vals = new List<int>();
+    }
+
+    class Program
+    {
+        static void f1(int x)
+        {
+            x = 5;
+        }
+
+        static void f2(ref int x)
+        {
+            x = 5;
+        }
+
+        static void f3(PassTest t)
+        {
+            t.vals.Add(5);
+        }
+
+        static void f4(ref PassTest t)
+        {
+            t = new PassTest(5);
+            t.vals.Add(10);
+        }
+
+        static void Main(string[] args)
+        {
+            internalexamples.
+            int x = 4;
+            f1(x);
+            Console.WriteLine(x);
+            f2(ref x);
+            Console.WriteLine(x);
+            PassTest t = new PassTest(x);
+            Console.WriteLine(string.Join(",", t.vals.ToArray()));
+            f3(t);
+            Console.WriteLine(string.Join(",", t.vals.ToArray()));
+            f4(ref t);
+            Console.WriteLine(string.Join(",", t.vals.ToArray()));
+        }
+    }
+}
diff --git a/Day 2 Class Examples/example7/Program.cs b/Day 2 Class Examples/example7/Program.cs
new file mode 100644
index 0000000..f22bc13
--- /dev/null
+++ b/Day 2 Class Examples/example7/Program.cs	
@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace example7
+{
+    class Program
+    {
+        class Example
+        {
+            private int test1;
+            public int test2;
+            protected int test3;
+
+            public virtual void func(int x) { }
+            private void func2() { }
+        }
+
+        class Ex2 : Example
+        {
+            public override void func()
+            {
+                base.func(x);
+            }
+        }
+
+        static void Main(string[] args)
+        {
+            Example e = new Example();
+            e.test2 = 2;
+        }
+    }
+}
diff --git a/Day 2 Class Examples/example9/Program.cs b/Day 2 Class Examples/example9/Program.cs
new file mode 100644
index 0000000..381ee65
--- /dev/null
+++ b/Day 2 Class Examples/example9/Program.cs	
@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace example9
+{
+    class DisposeTest : IDisposable
+    {
+
+        public void Dispose()
+        {
+            Console.WriteLine("Cleaning up DisposeTest");
+        }
+    }
+
+    class DestructTest
+    {
+        ~DestructTest()
+        {
+            Console.WriteLine("Cleaning up DestructTest");
+        }
+    }
+
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            {
+                DestructTest t2 = new DestructTest();
+            }
+            //GC.Collect(3, GCCollectionMode.Forced);
+            Console.WriteLine("top");
+            using (DisposeTest t = new DisposeTest())
+            {
+
+            }
+            Console.WriteLine("bottom");
+        }
+    }
+}