Some Important Keywords in C#

//

// Use the string extension method on this value.

//

string value = "SAIRAM";

value = value.LowercaseFirstLetter(); // Called like an instance method.

Console.WriteLine(value);

}

}

Output

sairam

Object Initializer

An Object Initializer is used in place of constructors. It reduces the lines of code, and not only does it reduce the code but also increases the flexibility. Using an Object Initializer we can also overcome the problems of constructor overloading.

Example

The following is an example:

var customer = new customer() { filed1= value1, field2 =value2}// in this we are not creating an instance of a constructor.

If we use a constructor then we must create the instance when we want to declare the values, so that we will not be clean and good to use.

Nullable Types

When we declare a variable as an int the variable should not be null. If we declare that variable as null then the exception occurs as int cannot be null, so by using a nullable type we can avoid that kind of exception. It is specified with a "?" symbol.

Example

The following is an example:

int a;

a=null; // here the exception occur

int? a;

a= null// exception doesn't occur

int? id = 10;

id = 0;

id = null;

DateTime? ds = null;

char? ch = null;

Anonymous Methods

We can dynamically create methods without declaring a class.

Example

The following is an example.

class Class1

{

public static void Main()

{

//Anonyumus type to create objects dynamically without declaring class

string adres = "MA";

var vcustomer = new{ name = "abc", id = 10, addres = adres };

var vstudent=new {id="Adfads",startdate=System.DateTime.Now,addres=new{city="MA",country="USA"}};

}

}