update row by primary key does not return any row


I'm new to vb.net 2005 and I'm trying to update a row by finding it through the primary key as in the example from microsoft:

Its probably something very basic.
my code below does not find the row and returns nothing. (errors out at row with FindBy<field> method)

I checked and i do have a primary key

whats wrong?
Dim tblAdapterCRMdemo As New DataSet1TableAdapters.tblCRMdemographicsTableAdapter
Dim tblDemo As New DataSet1.tblCRMdemographicsDataTable

sub page load
end sub

Protected Sub PostChanges(ByVal crmNum As String)
Dim newCRMDemographicsRow As DataSet1.tblCRMdemographicsRow
newCRMDemographicsRow = Me.tblDemo.FindByCRMresNumber(cint(crmNum))
newCRMDemographicsRow.MaritalStatusID = Me.cmbMaritalStatus.SelectedItem.Value


End Sub

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From your code I am unable to see where you filled the data into tblDemo.

Maybe row 5 should read Fill(tblDemo) ??

Dab as

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carlosmonteAuthor Commented:
if have added:
in line 5 but still FindBy returns an empty row.
error still says
Object reference not set to an instance of an object.

Line 483:        newCRMDemographicsRow = Me.tblDemo.FindByCRMresNumber(CInt(crmNum))
Line 484:        newCRMDemographicsRow.MaritalStatusID = Me.cmbMaritalStatus.SelectedItem.Value

Fails in line 484 because in line 483 newCRMDemographicsRow is empty.
Place a breakpoint (F9) on line 483
Right click tblDemo and select QuickWatch
Scroll down to Rows, then have a look at its Count property
How many rows are there?

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