The sistuation:

when i loading the data source of comboBox as following code, it will trigger the SelectedIndexChanged event, even I add the handler after assign the datasource.....

ds = data.GetDataSet()

dt = ds.Tables(0)
If dt.Rows.Count > 0 Then
'Me.comboBox.DataSource = dt
'Me.comboBox.DisplayMember = "name"
Me.comboBox.ValueMember = "id"
Me.comboBox.SelectedIndex = -1
End If

AddHandler comboBox.SelectedIndexChanged, _

AddressOfcomboBox_SelectedIndexChanged

How can i avoid the event when the control is binding the datasource?

Thanks,

hi Jerrrrrry

I found two problems about your source code:

1. AddHandler: I think it should be RemoveHandler
2. The Position of "AddHandler comboBox.SelectedIndexChanged, AddressOfcomboBox_SelectedIndexChanged" code, It should be the position before you bind the data to combobox

So you should write the code below:

I have tried the code, it work fine.

hi Jerrrrrry

I found two problems about your source code:

1. AddHandler: I think it should be RemoveHandler
2. The Position of "AddHandler comboBox.SelectedIndexChanged, AddressOfcomboBox_SelectedIndexChanged" code, It should be the position before you bind the data to combobox

So you should write the code below:

I have tried the code, it work fine.