C# defines seven categories of variables: static variables, instance variables, array elements, value parameters, reference parameters, output parameters, and local variables. The sections that follow describe each of these categories.

[Example: In the example

class A { public static int x; int y; void F(int[] v, int a, ref int b, out int c) { int i = 1; c = a + b++; } }

x is a static variable, y is an instance variable, v[0] is an array element, a is a value parameter, b is a reference parameter, c is an output parameter, and i is a local variable. end example]

In This Section:

• 12.1.1: Static variables
• 12.1.2: Instance variables
• 12.1.3: Array elements
• 12.1.4: Value parameters
• 12.1.5: Reference parameters
• 12.1.6: Output parameters
• 12.1.7: Local variables