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Editorial Team
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Asked: 2026-05-28T06:47:58+00:00

I have a data-bound combobox on a Windows form. When I select an item,

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I have a data-bound combobox on a Windows form. When I select an item, all of the other bound components update properly. However, the list of drop-down items changes so that the selected item is duplicated in the list. For example, here is the original list:

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This is what the list looks like when I select an item:

enter image description here

The combobox is bound to a bindingsource that gets its data from a LINQ to SQL query. The Display Member is the SpecName, the Value Member is the SpecID and the Selected Value is the SpecID field in the bindingsource.

How can I correct this duplication behavior?

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1 Answer

  1. Editorial Team

    When I encountered a similar situation, the cause was the combobox Databindings|Text property.

    I could duplicate the behavior described when this property was set to the relevant binding source and display field.

    Setting the property to None caused the behavior to cease.

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