ASP constants and variables Built-in constants Empty The empty constant is used to indicate an uninitialized variable value. Empty is not the same as Null Uninitialized [variable value]: A variable that has no value assigned to it. Nothing The Nothing constant is used to disassociate an object variable from any actual object. Use the Set statement to assign Nothing to an object variable, like this: Set oVariable = Nothing This will be discussed further in a later module. Null The Null constant is used to indicate that a variable contains no valid data. Null is not the same thing as Empty. True The True constant has a value always equal to -1 False The False constant has a value always equal to 0