What is the use of default keyword?

Answer:

It is used in 2 contexts.

1)With the switch statement.
example:

Console.WriteLine("enter number");

int a=Int32.Parse(Console.ReadLine());

switch(a)

{

case 100:

Console.WriteLine("correct");

break;

default:

Console.WriteLine("100 is right value");

break;

}

2) Provide default values for value types (which is 0) and null value as the default value

for the reference types:

example: int a=default(Int32);
default for a will be 0.