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VB.net Events and Databinding

BobBarker_99
BobBarker_99 asked
on
Medium Priority
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Last Modified: 2012-05-07
I've posted my code below.  I have 2 combo boxes (cbo1 and cbo2)

When the user selects a value from cbo1, and changes focus, I want to set the value of cbo2 based on the selected value of cbo1.  

The fetchList call works fine, it returns the selected list.

Here is the problem.  When I select an item from cbo1, and then cause it to lose focus, the below function is called, BUT cbo2 is blank.  If i select the same item again (from cbo1) and lose focus again, cbo2 is then filled properly.

Can anyone point out what I'm doing wrong?


Private Sub cbo1_LostFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles cbo1.LostFocus
        If cbo1.SelectedValue Is Nothing Then Exit Sub
            cbo2.DisplayMember = "DisplayString"
            cbo2.ValueMember = "Value"
            cbo2.DataSource = myClass.fetchList(cbo1.SelectedValue)
  
    End Sub

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Top Expert 2013

Commented:
set breakpoint at line: If cbo1.SelectedValue Is Nothing Then Exit Sub
and see the value of cbo1.SelectedValue  when the first time it is not being populated...
Could be that value is being not set for some reason ...
√Čric MoreauSenior .Net Consultant
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Commented:
I think using the SelectedIndexChanged event may help.

Author

Commented:
I have tried setting a breakpoint.  The selected value is as expected, but the second combo box does not populate.
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Author

Commented:
Found it.  It was returing results, but different results the first and second time through.  Tracked it down, the cbo1.selectedValue wasnt what I expected teh first time through.
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