[RESOLVED] [2005] RevoveHandler Question

I am having a little trouble with event handlers:

I would like to disable (remove) the combobox event handler shown below so that the event will not fire when the value of the combobox is changed programmatically. The event was originally added using AddHandler.

Code:

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1  RemoveHandler ComboBox1.SelectedIndexChanged, AddressOf ComboBox1_SelectedIndexChanged
       
2  Me.ComboBox1.SelectedValue = ""
3  Me.ComboBox2.SelectedValue = ""
4  Me.ComboBox9.SelectedValue = ""
5  Me.SchoolFilterList.Text = ""

6  AddHandler ComboBox1.SelectedIndexChanged, AddressOf ComboBox1_SelectedIndexChanged

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The event for ComboBox1.SelectedIndexChanged still fires when the selected valve for combobox1 is set to “” in line 6. I can not see any code that might be ADDING multiple eventhandlers.

Any thoughts on how to keep the combobox from firing during programatic changes are appricated in advance.

declare a form level boolean variable:

vb Code:

dim ignore as boolean = false

check if ignore = true in your ComboBox1_SelectedIndexChanged event and only execute the code if its false. to not execute the code, set ignore = true before changing ComboBox1.SelectedIndex

Did you add this ComboBox at runtime or in the design-view? I might be wrong on this but, I think that when adding a control at design-time, eventhandlers are automatically added for certain events. So if you're using AddHandler to add another eventhandler at runtime you might end up with multiple eventhandlers even though it wouldnt look like it.

The comboboxes are added at Design time. I commented out the Handles statement and used the AddHandler statement after the form loaded up. For example:

Code:

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Private Sub DateTimePicker2_ValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DateTimePicker2.ValueChanged 

        Becomes

Private Sub DateTimePicker2_ValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) 'Handles DateTimePicker2.ValueChanged

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Then I use:

Code:

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AddHandler DateTimePicker2.ValueChanged, AddressOf DateTimePicker2_ValueChanged

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My hope was that I could use the RemoveHandler statemen to control the event handling. Is this wrong?

Regardless- I used Paul’s suggestion and it worked fine. Thanks :thumb: