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Asked: 2026-06-07T23:14:48+00:00

I’ve been populating a combobox this way (getRoundingMethodVals() returns a List <String >): comboBoxRounding.DataSource

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I’ve been populating a combobox this way (getRoundingMethodVals() returns a List<String>):

comboBoxRounding.DataSource = RateSetupData.getRoundingMethodVals();

…but I saw on a StackOverflow answer the following:

comboBox1.DataSource = new BindingSource(dict, null);

…which makes me wonder if I should change my code to:

comboBoxRounding.DataSource = new BindingSource(RateSetupData.getRoundingMethodVals(), null);

Is this a six-of-one-and-half-a-dozen-of-the-other situation? Or does one way hold a strong advantage over the other?

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  1. Editorial Team

    Depends on what you want to do. If you just need to populate the comboBox for a user to select a value, then your first way works very well. It’s a one way data flow: from lsit to control. In your case, a simple List(Of String) doesn’t need a binding source.

    However, if you have a much more complex object and want a change in the combobox value to also change the value of that object, you would use the BindingSource. This creates a two-way data flow. (For this scenario, you could use a BindingList which implements many of the BindingSource interfaces.)

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