Object Reference not set to an instance of an object

[KA NMC]

I have a treelistview that is populated with parent child. What I'm trying to do is when the user clicks on the parent place the subitems text into a textbox

TextBox1.Text = treeListView1.SelectedNodes(0).SubItems(4).Text & ""

Which works fine when I click on a parent, But when I click on the first record child I get error Object Reference not set to an instance of an object.

when I click on the second record child I get specified argument was out of range the valid values parmeter name: Index was out of range. Must be non-negative and less then the size of the collection.

Here is the simple code that dont work
Private Sub treeListView1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles treeListView1.Click

Try
If treeListView1.SelectedNodes(0).SubItems(4).Text Is DBNull.Value Then
TextBox1.Text = ""
Else
TextBox1.Text = treeListView1.SelectedNodes(0).SubItems(4).Text & ""
 
End If
Catch ex As Exception
MsgBox(ex.Message)
 
End Try
 
End Sub

Any Ideas on how I will tell it - if child rec do nothing.

Thanks

Thank You

[Plater]

You should be checking for null and index counts.

If treeListView1.SelectedNodes(0) != NULL)
 

And I couldn't find a property called SelectedNodes, but you should be checking to make sure there are at least 4 of those too, if you want to avoid the errors.

[KA NMC]

Thanks Plater the reason you dont see selectedNodes is because I'm using a custom control that combines treeview and listview together, so the properties are a mix of the two and new ones I've never seen before but the wording and results are similar to what a treeview or listview would provide. Its like driving a stick for the first time after driving automatic for most of your life. You get the concept but your still not getting it (Bunch of bumps in between).

This is what I've tried

 If treeListView1.SelectedNodes(0) Is DBNull.Value Then
                TextBox1.Text = ""
            Else
                TextBox1.Text = treeListView1.SelectedNodes(0).SubItems(4).Text & ""
            End If
 

But I'm thinking I need to go back a step and check on the data I'm pulling because it does make sense to get this error when clicking on the child
because the child does not have a 4th subitem - it only has two. Maybe I should add two more?

You should be checking for null and index counts.

If treeListView1.SelectedNodes(0) != NULL)
 

And I couldn't find a property called SelectedNodes, but you should be checking to make sure there are at least 4 of those too, if you want to avoid the errors.

[KA NMC]

Still the same error...I'm stumped...if you have anymore Ideas that will be great.

Thanks Plater the reason you dont see selectedNodes is because I'm using a custom control that combines treeview and listview together, so the properties are a mix of the two and new ones I've never seen before but the wording and results are similar to what a treeview or listview would provide. Its like driving a stick for the first time after driving automatic for most of your life. You get the concept but your still not getting it (Bunch of bumps in between).

This is what I've tried

 If treeListView1.SelectedNodes(0) Is DBNull.Value Then
                TextBox1.Text = ""
            Else
                TextBox1.Text = treeListView1.SelectedNodes(0).SubItems(4).Text & ""
            End If
 

But I'm thinking I need to go back a step and check on the data I'm pulling because it does make sense to get this error when clicking on the child
because the child does not have a 4th subitem - it only has two. Maybe I should add two more?

[Shashi Sadasivan]

So even during debugging (especially at the second error- which should then show something in the 1st position of the array)
It isint showing anything informationsl?

[KA NMC]

Yup thats correct its not showing anything...I really dont understand...Not surprising because usually the simple things that will get you...

So even during debugging (especially at the second error- which should then show something in the 1st position of the array)
It isint showing anything informationsl?

[Plater]

Well I guess start at the topmost, and make sure treeListView1 isn't null.
Then work your way down.
Although if you set a breakpoint in there, you should be able to sift through the treeListView1 object in the watch window and see what all is inside it.

[KA NMC]

So I goooffed - I wanted to add the 4th empty column to the child, so thinking 1,2,3,4 - I added two - when I needed to add 3 (0,1,2,3,4) - so I no longer getting the first err Object Reference not set to an instance of an object, but I'm still getting

specified argument was out of range the valid values parmeter name: Index was out of range. Must be non-negative and less then the size
when clicking on the second records child....I dont know about this one...hmmm

But I'm thinking I need to go back a step and check on the data I'm pulling because it does make sense to get this error when clicking on the child
because the child does not have a 4th subitem - it only has two. Maybe I should add two more?

[KA NMC]

I'll give it a shot again...something I'm missing big time

Well I guess start at the topmost, and make sure treeListView1 isn't null.
Then work your way down.
Although if you set a breakpoint in there, you should be able to sift through the treeListView1 object in the watch window and see what all is inside it.