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Are both bound to same dataset and binding source or separate?
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Are both bound to same dataset and binding source or separate?

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If you stop the application with the debugger, does the dataset for the empty combobox have data, or is it empty?
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If you stop the application with the debugger, does the dataset for the empty combobox have data, or is it empty?

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without your code is impossible to give some help, can you attach here the form source ?
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without your code is impossible to give some help, can you attach here the form source ?

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I ended up solving the problem myself. &nbsp;Thanks for the help, though.
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I ended up solving the problem myself.  Thanks for the help, though.

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I have a couple of instances where I have a comboboxes menu in VB.Net, and I've bound it to a Binding source, which, in turn, is bound to an &quot;.xsd&quot; file, which defines a SQL-Server-based dataset. <br />
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I have two adjacent comboboxes, both with virtually the same arrangement of data bindings, and one populates, the other does not. &nbsp;From the dataset designer, both queries work perfectly, giving me the results I expect. &nbsp;As an experiment, I unchecked the box on both comboboxes that says &quot;Use Databound items&quot; and then re-established the datasets on both. &nbsp;As before, the first resumed working and other resumed providing me with an empty list. &nbsp;<br />
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I thought it time to get some advice on this. &nbsp;Dropdowns have been a headache for me for a while. &nbsp;Thanks, ~Peter Ferber
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I have a couple of instances where I have a comboboxes menu in VB.Net, and I've bound it to a Binding source, which, in turn, is bound to an ".xsd" file, which defines a SQL-Server-based dataset. 

I have two adjacent comboboxes, both with virtually the same arrangement of data bindings, and one populates, the other does not.  From the dataset designer, both queries work perfectly, giving me the results I expect.  As an experiment, I unchecked the box on both comboboxes that says "Use Databound items" and then re-established the datasets on both.  As before, the first resumed working and other resumed providing me with an empty list.  

I thought it time to get some advice on this.  Dropdowns have been a headache for me for a while.  Thanks, ~Peter Ferber

VB.Net: Populating comboboxes from data source

Visual Basic .NET (VB.NET) is an object-oriented programming language implemented on the .NET framework, but also supported on other platforms such as Mono and Silverlight. Microsoft launched VB.NET as the successor to the Visual Basic language. Though it is similar in syntax to  Visual Basic pre-2002, it is not the same technology,

Visual Basic.NET

Microsoft SQL Server 2008 is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning. Major improvements include the  Always On technologies and support for unstructured data types.