default value of a variable at the time of declaration in C# and VB?

Question

Can anybody tell me what is the default value of a variable at the time of declaration in C# and vb??

Answer 1

In c# you can use the default keyword to determine default values.

For example:

default(bool)
default(int)
default(int?)

Answer 2

Do you mean a (method) variable? or a field (on an instance or type)?

For a method-level variable (in C# at least) it is irrelevant, since "definite assignment" means that you must give it a value before you can read it.

Fields default to the bitwise zero state:

• for reference types (including string) that means null
• for Nullable<T> (int? etc) that means null
• for numerics that means 0
• for enums that means 0 even if there is no 0-valued enum defined
• for bools that means false
• for DateTime, that means the same as MinValue
• for other structs, you'll have to check their documentation, but it will be a (hopefully sensible) "zero/empty" value