If Typeof

Determines if an object is of a given class.

Is Object Of Class Method

IsDate

Determines if an expression evaluates to a date that Oracle's Siebel VB allows.

Is Expression a Date Method

IsEmpty

Determines if a variant has been set.

Is Variable Set Method

IsMissing

Determines if an optional argument for a procedure is missing.

Is Optional Argument Missing Method

IsNull

Determines if a variant contains a NULL value.

Is Variable Null Method

IsNumeric

Determines if a value is a valid number.

Is Variable Numeric Method