hence you have to define data type for variables

Data Types in a programming language describes that what type of data a variable can hold . C# is a strongly typed language, hence you have to define data type for variables. you cannot use variable without data types.

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.

The varibles in C#, are categorized into the following types:

• Value types
• Reference types
• Pointer types

(a)Value Types:

 If a variable holds actual value then the type of data types are value types. Value type variables can be assigned a value directly. They are derived from the class System.ValueType. These value types are stored in “stack” memory and these value types are fixed in size. If you assign a value of a variable to another variable it will create two copies.

Ex: byte, short, int, float, double, long ,char, bool, DateTime.

All primitive data type except string and object are example of value types.

Object is a super type. It can store any type and any size of data. Object is called super type because it helps in inheritance.

struct and enum are value type.

CSharp has a set of predefined value types