What's a 'var' datatype?

Question

I want to know what is a 'var' datatype? I always saw it written into the codes but never learn what it is and when to use it.

Answer 1

var is a special data type that automatically converts the variable to a different data type, depending on what it's assigned. Because of this, it has to be assigned a value immediately.
Ex: "var price = 5.50;" will make price a double.

It's not a good idea to rely on this conversion, so it's usually used in situations where the data type is already written there.
Ex: "var Names = new List<string>();" will always be a List of strings, it's better than writing the long type name twice.

Answer 2

Oh yeah, that was probably not a good choice for an example...this app doesn't cover it, I don't think.
Lists are a bit like arrays, but you don't have to specify how many slots of data you want. You can just add or remove them as needed. You must put a data type in the angle brackets <>.
To use List<>, you need to add the line "using System.Collections.Generic;" to the top of the file. Making a List<> is like making an object or array.

For why I used it as an example with using var, ordinarily the line to make one would be written:
List<string> names = new List<string()>;
It's just a bit shorter to use var!

Answer 3

Var is not a datatype. It's a keyword.

Answer 4

thakns tamara.
now its clear to me.
actually i didnt saw any code like your example . thats why i was confused.

Answer 5

can anyone explain this code. plllzzz
Ex: "var Names = new List<string>;" will always be a List of strings, it's better than writing the long type name twice

Answer 6

Thanks everyone how help to solve my doubt. Now I know when to use var datatype.