Use of Var in C #

When you do not know in advance what type of variable you need to define, you can use Var to define it.

such as: Var a=1; A is the int type, var b= "abc", then B is the string type, and the type of the variable cannot be changed

When defining variables with Var, it is important to note that:

1: Must be initialized at the time of definition, that is, can not be defined after initialization, such as: var a;a = 1; This is not allowed

2: Once the initialization is complete, the type of the variable cannot be changed

A variable of type 3:var must be a local variable

Use of Var in C #