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In my window application i have list view with 4 column.i want to check 3rd sub item is empty or not in all the rows.if it was empty i need to prompt an error.how to check sub-item 3 doesn't have any values?
Posted
Comments
Richard MacCutchan 20-Jun-13 3:29am    
Read the items and test them; how else?

1 solution

VB
If myListView.Items(17).SubItems(3) Is Nothing Or myListView.Items(17).SubItems(3).Text <> "" Then


Or if you need to check all:

VB
Dim emptyFieldExists As Boolean = False

For Each item As ListViewItem In myListView.Items
    If item.SubItems(3) Is Nothing Or item.SubItems(3).Text <> "" Then
        emptyFieldExists = True
    End If
Next

If emptyFieldExists Then
    'Do what you need to do!
End If
 
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v5
Comments
jai_mca 21-Jun-13 5:34am    
when the flow reaches if item.SubItems(3) condition it prompt the error like the below


InvalidArgument=Value of '3' is not valid for 'index'.
Parameter name: index
Johnny J. 21-Jun-13 5:42am    
That's why you need to check is the item is nothing before checking the text property. If my code above still fails, try nesting the conditions:

Dim emptyFieldExists As Boolean = False

For Each item As ListViewItem In myListView.Items
If Not item.SubItems(3) Is Nothing Then
If item.SubItems(3).Text <> "" Then
emptyFieldExists = True
End If
Else
emptyFieldExists = True
End If
Next

If emptyFieldExists Then
'Do what you need to do!
End If
jai_mca 21-Jun-13 7:49am    
thanks johnny..
but now also it prompt the same error,
when it reaches item.subitem[3].text
Johnny J. 22-Jun-13 9:38am    
Try this:

Dim emptyFieldExists As Boolean = False

For Each item As ListViewItem In myListView.Items
If item.SubItems.Count > 4 Then
If Not item.SubItems(3) Is Nothing And item.SubItems(3).Text <> "" Then
emptyFieldExists = True
End If
Else
emptyFieldExists = True
End If
Next

If emptyFieldExists Then
'Do what you need to do!
MsgBox("Empty items")
Else
MsgBox("No Empty items")
End If

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