I have a control that inherits from ComboBox. In some of my code I want to un-select what is currently selected in the combo. I do think by setting SelectedIndex = -1. This works fine, except sometimes it will suddently selected the first item in the list. It appears to be coming from the CurrencyManager.OnPositionChanged event (not my code). Any ideas? Here is the stack trac:

System.Windows.Forms.dll!System.Windows.Forms.ComboBox.SelectedIndex.set(int value) + 0xa3 bytes
System.Windows.Forms.dll!System.Windows.Forms.ListControl.DataManager_PositionChanged(object sender, System.EventArgs e) + 0x2e bytes
System.Windows.Forms.dll!System.Windows.Forms.CurrencyManager.OnPositionChanged(System.EventArgs e) + 0x39 bytes
System.Windows.Forms.dll!System.Windows.Forms.CurrencyManager.ChangeRecordState(int newPosition, bool validating, bool endCurrentEdit, bool firePositionChange, bool pullData) + 0x14f bytes
System.Windows.Forms.dll!System.Windows.Forms.CurrencyManager.Position.set(int value) + 0x40 bytes
System.Windows.Forms.dll!System.Windows.Forms.ComboBox.OnSelectedIndexChanged(System.EventArgs e) + 0xed bytes

Hi,

->except sometimes it will suddently selected the first item in the list.

When does it suddenly change the selected index? If the datasource is reset, the selectedIndex will be set to 0.

Best regards,

Ling Wang

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It seems to happen when I set the SelectedIndex to -1, I have gotten around this by setting it twice, because the first time it doesn't really work, I end up at SelectedIndex 0.

Wil,

I just thought I'd validate your workaround ... I have usedthis workaround (setting SelectedIndex = -1 twice) since the old 1.1 daysback in 2002. It seems to solve the problem, so what the heck. ;0)

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Best regards,
Ling Wang

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