Used to compare expressions.
result = expression1 comparisonoperator expression2 result =object1 Is object2 
Parts
 result

Any numeric variable.
 expression

Any expression.
 comparisonoperator

Any comparison operator.
 object

Any object name.
Remarks
The Is operator has specific comparison functionality that differs from the operators in the following table. The following table contains a list of the comparison operators and the conditions that determine whether result is True, False, or Null:
Operator  Description  True if  False if  Null if 

< 
Less than 
expression1 < expression2 
expression1 >= expression2 
expression1 or expression2 = Null 
<= 
Less than or equal to 
expression1 <= expression2 
expression1 > expression2 
expression1 or expression2 = Null 
> 
Greater than 
expression1 > expression2 
expression1 <= expression2 
expression1 or expression2 = Null 
>= 
Greater than or equal to 
expression1 >= expression2 
expression1 < expression2 
expression1 or expression2 = Null 
= 
Equal to 
expression1 = expression2 
expression1 <> expression2 
expression1 or expression2 = Null 
<> 
Not equal to 
expression1 <> expression2 
expression1 = expression2 
expression1 or expression2 = Null 
When comparing two expressions, you may not be able to easily determine whether the expressions are being compared as numbers or as strings.
The following table shows how expressions are compared or what results from the comparison, depending on the underlying subtype:
If  Then 

Both expressions are numeric 
Perform a numeric comparison. 
Both expressions are strings 

One expression is numeric and the other is a string 
The numeric expression is less than the string expression. 
One expression is Empty and the other is numeric 
Perform a numeric comparison, using 0 as the Empty expression. 
One expression is Empty and the other is a string 
Perform a string comparison, using a zerolength string ("") as the Empty expression. 
Both expressions are Empty 
The expressions are equal. 
Requirements
See Also
Reference
Assignment Operator (=) (VBScript)Is Operator
Operator Precedence (VBScript)