WinStudio

IsNull Property

Applies To

• IWSFormComponent interface
• IWSIDOProperty interface
• IWSVariable interface
• IGlobalScriptParm interface

Definition

Returns a Boolean value indicating whether the value of an object is empty (null). Read-only.

Syntax

object.IsNull

Remarks

A return value of:

• TRUE indicates that the value of the object is null.
• FALSE indicates that the value of the object is not null.

Examples

Sub Main()
   If ThisForm.Components("StringTableNameGridCol").IsNull Then
      Application.ShowMessage("The field is empty!")
   Else
      Application.ShowMessage("The value of the field is:" & vbLf & _
          vbLf & ThisForm.Components("StringTableNameGridCol").Value)
   End If
End Sub

Sub Main()
   Dim parameters() As IWSIDOProperty
   Dim myString As String
   If parameters(0).IsNull Then
      Throw New Exception("A value must be passed for the first parameter!")
   Else
      myString = parameters(0).GetValueOfString()
   End If
End Sub