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See Also
IsDate Function IsDate Function
IsNumeric Function IsNumeric Function
IsEmpty Function IsEmpty Function
IsArray Function IsArray Function
IsObject Function IsObject Function
VarType Function VarType Function
TypeName Function TypeName Function
Miscellaneous Functions Misc. Functions
Visual Basic Functions Visual Basic Functions
Visual Basic Home Visual Basic Home
 
Description  Syntax  Return Datatype  Example  Migration

IsNull Function - Visual Basic 6.0 (VB 6.0)

Returns a Boolean value that indicates whether an expression contains no valid data (Null).
Syntax:
IsNull(expression)
Parameter Description
expression Required. Can be any expression.
Return Data type:
Boolean
Example:

Dim vStr as String, vDt as Date, vInt as Integer, vBool as Boolean
Dim vArr(4, 3) as String, vSng as Single

Dim vVar
vVar = Null
vStr = "ABCD"


Statement Result Remark
IsNull(1) False  
IsNull(vStr) False  
IsNull(vArr) False  
IsNull(vDt) False  
IsNull("17/03/2007") False  
IsNull("1234abcd") False  
IsNull(vInt) False  
IsNull(vBool) False  
IsNull(vSng) False  
IsNull(unknown) False  
IsNull(vVar) True  
IsNull(True) False  
IsNull(False) False  
IsNull(null) False  
IsNull(0) False  
IsNull("abcd") False  
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Migration from Visual Basic 6.0 (VB 6.0) to
  IsNull Function in VB Script (VBS)
  IsNull Function in JScript (JS)
  IsNull Function in ASP (Active Server Page)
  IsNull Function in PHP Script
  IsNull Function in MS-Access
  IsNull Function in MS SQL Server
  IsNull Function in Oracle
  IsNull Function in C Language
  IsNull Function in C++ Language
  IsNull Function in Foxpro
  IsNull Function in Fortran
  IsNull Function in MS Excel Sheet
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