First of all you must modify your program and make it into a service. Writing a system service is different than writing a user mode program in a few ways. You should have a look at some articles on the web, you can start from here[^] for example. 2+2=5 for very large amounts of 2 (always loved that one hehe!)

No it's not bound based on this, but if you have set the DataSource property in designer it is bound in code-behind file. However, since you have code on several event handlers, I suggest that you put a breakpoint in every eventhandler where combobox4 is modified whether the eventhandler is for combobox4 or another object. When debugging the debugger should hit your breakpoint(s) and give you more info how/why the text is modifed. Perhaps the events are raised in different order than you expect or some code is called, which "resets" that combo. The need to optimize rises from a bad design.My articles[^]

If you can show me to set the tabbing in the listbox I would appreciate it. Yes I do have a lot of tab stops.

Singh, Thank you for your interest on this post but I got it all figured out. First I connect to the database then query the table and set it as DataTable. From the datatable I managed to looped for inconsistent Header and display them onto Comboboxes as Lists adapter.Fill(dt) Dim dc As DataColumn For Each dc In dt.Columns() .... end

Thank you.