pause at 3:00

C# Full Course for free/7.Strings methods.md

@@ -47,3 +47,16 @@ String fullName = "mrsh online";
 String firstName = fullName.Substring(0,4); 
 String lastName = fullName.Substring(5,6); 
 ```
+
+## String interpolation
+
+```C#
+String firstName = "mrsh";
+String lastName = "Online";
+int age = 21;
+
+Console.WriteLine($"Hello {firstName} {lastName}.");
+
+// include 10 spaces
+Console.WriteLine($"You are {age, 10} years old.");
+```