Thursday, December 28, 2017

Rules for naming variables in C#


In C#, the following rules are used for naming variables:

· A variable name must begin with a letter (a-z or A-Z) or an underscore (‘_’), which may be followed by a sequence of letters, digits (0-9), or underscores.

· The first character of a variable name cannot be a digit i.e. variable cannot starts with 0 to 9.

· A variable name must not contain any embedded spaces or symbols i.e. ? ! @ # + - % ^ & * ( ) [ ] { } . , ; : ″ ′ / and \.

· Instead of giving space to make a meaning, an underscore can be used wherever a space is required, like Highest_Marks.

· A variable name must be unique. For example, to store two different values, two unique variable names must be declared.

· A variable name can have any number of characters i.e. a variable name can be of any length.

· Keywords or reserved words cannot be used as variable names. For example, you cannot declare a variable named class as it is a keyword.

· C# is a case-sensitive language. It means that the Highest_Marks variable is not the same as the highest_marks variable. In other words, Uppercase letters are considered distinct from lowercase letters.

Examples of valid variable names are:

v  Error_Message

v  ResponseMessage

v  This_variable_name_is_very_long

v  _SerialNumber


Examples of invalid variable names are:

v  #count

v  2index

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