diff --git a/C# Full Course for free/12.arrays.md b/C# Full Course for free/12.arrays.md
new file mode 100644
index 0000000..f9ae4e4
--- /dev/null
+++ b/C# Full Course for free/12.arrays.md	
@@ -0,0 +1,18 @@
+# Arrays
+
+```C#
+String[] cars = {"BMW", "Mustang", "Corvette"}
+
+Console.WriteLine(cars[0])
+// Output : BMW
+
+cars[0] = "Ferrari"
+Console.WriteLine(cars[0])
+// Output : Ferrari
+
+
+Console.WriteLine(cars.Length)
+// Output : 3
+
+String[] cars = new string[3]
+```
diff --git a/C# Full Course for free/13.methods.md b/C# Full Course for free/13.methods.md
new file mode 100644
index 0000000..bf6a8fd
--- /dev/null
+++ b/C# Full Course for free/13.methods.md	
@@ -0,0 +1,25 @@
+# Methods
+
+```C#
+singHappyBirthday();
+
+static void singHappyBirthday(){
+
+Console.WriteLine("Happy birthday to you")
+}
+```
+
+## arguments
+
+```C#
+String name = "mrsh"
+int age = 30;
+
+singHappyBirthday(name, age);
+
+static void singHappyBirthday(String namem int age){
+
+Console.WriteLine("Happy birthday to you" + name)
+Console.WriteLine("you are " + age + "years old")
+}
+```
diff --git a/C# Full Course for free/9.Loops.md b/C# Full Course for free/9.Loops.md
index cff5cc5..5109122 100644
--- a/C# Full Course for free/9.Loops.md	
+++ b/C# Full Course for free/9.Loops.md	
@@ -20,3 +20,14 @@ for (int i = 0; i < 10 ; i++)
     Console.WriteLine(i)
 }
 ```
+
+## foreach
+
+```C#
+String[] cars = {"BMW", "Mustang", "Corvette"}
+
+foreach(String car in cars){
+    Console.WriteLine(car)
+}
+
+```