Data Types in a programming language describes that what type of data a variable can hold . CSharp is a strongly typed language, therefore every variable and object must have a declared type. The CSharp type system contains three Type categories. They are Value Types , Reference Types and Pointer Types . In CSharp it is possible to convert a value of one type into a value of another type . The operation of Converting a Value Type to a Reference Type is called Boxing and the reverse operation is called Unboxing .

When we declare a variable, we have to tell the compiler about what type of the data the variable can hold or which data type the variable belongs to.

  Syntax : DataType VariableName
  DataType : The type of data that the variable can hold
  VariableName : the variable we declare for hold the values.

Example:

  int count;
  int : is the data type
  count : is the variable name

The above example shows , declare a variable 'count' for holding an integer values.

The following are the commonly using datatypes in C# .

bool

The bool keyword is an alias of System.Boolean. It is used to declare variables to store the Boolean values, true and false. In C# , there is no conversion between the bool type and other types.

  C#  Runtime type : System.Boolean
  CSharp declaration : bool flag;
  CSharp Initialization : flag = true;
  CSharp default initialization value : false 

int

int variables are stored signed 32 bit integer values in the range of -2,147,483,648 to +2,147,483,647

  C#  Runtime type : System.Int32
  CSharp declaration : int count;
  CSharp Initialization : count = 100;
  CSharp default initialization value : 0

decimal

The decimal keyword denotes a 128-bit data type.The approximate range and precision for the decimal type are -1.0 X 10-28 to 7.9 X 1028

  C#  Runtime type : System.Decimal
  CSharp declaration : decimal val;
  CSharp Initialization : val = 0.12;
  CSharp default initialization value : 0.0M

string

The string type represents a string of Unicode characters. string variables are stored any number of alphabetic,

numerical, and special characters .

  C#  Runtime type : System.String
  CSharp declaration : string str;
  CSharp Initialization : str = "csharp string";