C# 3.0 features

1. 3.0 allows properties without local variables
2. var  (varient) - it is implicitly typed variable
3. Anonymous variable
4. Lamda expression
5. FUNC<>
6. Extention Method

Here is the detail:

1. C#3.0 allows properties without local variables: 

Tip: Type prop in the visual studio and press tab

 2.  Simple and implicitly typed local variable

• It is implicitly typed variable
• var i=10;
• var str="nidhish";
• var x="109"; // It is invalid. Compiler does not allow this.
• var CANNOT be used as a parameter or a return type. It is heavily used in LINQ

3. Anonymous variable:

• it is helpful for object initialization
• Example:

List mystring=new List {
  "Item1",
  "Item2",
  "Item3"}

4. Lamda expression:

• Example:

delegate long myadd(int n1,int n2);
Public void TestLamda()
{
   myadd ad= (n1,n2) => { return n1+n2; };
   Console.WriteLine(ad.invoke(100,150));
}

5. Extending type with extension method

Extension method provide developers to extend the functionality of an existing type. Extension methods are static methods with keywork this

Eg: Extend string class with a reverse method