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how check if an object is set to an instance

Posted on 2004-09-24
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Last Modified: 2010-04-23
hello

i keep getting object not set to an instance

when i check if an object (MyObject.OrganisationDetails.ContactDetails.Telephones(0)) exists:

i tried:
            If Not IsDBNull(MyObject.OrganisationDetails.ContactDetails.Telephones(0)) Then
            If Not (MyObject.OrganisationDetails.ContactDetails.Telephones(0)) is nothing Then

but both return that same error.

how do i check an object that may not exist - to see if it does exist






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Question by:MrKevorkian
3 Comments
 
LVL 10

Accepted Solution

by:
fds_fatboy earned 250 total points
ID: 12143660
Do you mean like this?

Dim bExists As Boolean = False

If Not MyObject Is Nothing Then
    If Not MyObject.OrganisationDetails Is Nothing Then
        If Not MyObject.OrganisationDetails.ContactDetails Is Nothing Then
            If Not MyObject.OrganisationDetails.ContactDetails.Telephones(0) Is Nothing Then
                bExists = True
            End If
        End If
    End If
End If

If bExists Then...
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LVL 1

Author Comment

by:MrKevorkian
ID: 12144940
perfect.

0
 
LVL 6

Expert Comment

by:KGreg
ID: 12144955

public function HasTelephoneNumber as boolean
        Try
             if MyObject.OrganisationDetails.ContactDetails.Telephones.Count > 0 then
                 Return True
             end if
        Catch ex As NullReferenceException
             return False
        End Try
end function


KGreg
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