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Nevermind. 10 hours and looking and 1 minute after my post I fixed it. In sub #1, I should have not be using ds.dispose() at the finish. Changed to ds.clear() and error goes away. This must be the result of sub #1 residing in a form that never disposes? The concurrency error really sucks. It...

I am stuck with something that must be right in front of me but I have spent so many hours working on it that I must be missing it. I will try and simplify the scenario. I have a table that is updated by the user clicking buttons that are a part of a datagridview. Each button click assigns...

Wow. Thank you so much. I guess I should have noted that I need to stay in 2.0 as this app will be freely distributed and it is anticipated that many end users will not be up to date. (govt. sector...) It is my understanding that ADO.NET requires 3.5. Is that correct? Regardless, I am a fan of...

A user is a water user that has population, use per day, roof size, cost, etc. There will be other data (% increase of use and cost) that will apply to all users. This is a simulation model that runs over a 10-50 year period with daily reporting. I have been considering using either .txt files...

Hi. New to vb.net coming from vba. I am working on a mass balance model which collects a handful of 'user' data (less than 10 records) and then applies various equations to the data and records/reports the resulting values. I think I have a pretty good handle on the basic operators for a single...