How To check Null values

Posted on 2008-06-20
Last Modified: 2010-04-23
I retrieve value from a database and save it in a variable , How Can I check if it is null value

Dim MyAccID As Integer = BillMasterTable.Rows(0).Item("AccID")

If MyAccID is Null  ' How To do that
Question by:Ahmadal_najjar2003
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LVL 143

Accepted Solution

Guy Hengel [angelIII / a3] earned 350 total points
ID: 21831856
IsDBNull() function is what you need:

if IsDBNull (BillMasterTable.Rows(0).Item("AccID")) Then

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LVL 39

Assisted Solution

appari earned 50 total points
ID: 21831864
if isnothing(MyAccID )


if MyAccID  = dbnull.value
LVL 19

Assisted Solution

by:Stephen Manderson
Stephen Manderson earned 100 total points
ID: 21831901
If you are trying to trap errors when loading from a db this is how I do it.

Dim MyAccID As Integer = CheckForNullInteger(BillMasterTable.Rows(0).Item("AccID"))

    Public Function CheckForNullInteger(ByVal Value As Object) As Integer
        If Value Is System.DBNull.Value Then
            Return Value
        End If
    End Function
    Public Function CheckForNullDate(ByVal Value As Object) As DateTime
        If Value Is System.DBNull.Value Then
            Return Value
        End If
    End Function
    Public Function CheckForNullString(ByVal Value As Object) As String
        If Value Is System.DBNull.Value Then
            Return ""
            Return Value
        End If
    End Function

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Author Comment

ID: 21832066
Yes AngelIII, You touch the target.
Very good Functions from MrManderson.
And thanks to appari.

Author Closing Comment

ID: 31469178
Thanks To all.

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