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However that may be because I just instantiate a new datagridview object on the fly and attempt to set its datasource within the button click event of an existing form. For anyone else still struggling out there, I thought I'd make a comment in response to: "(2) When I finally got data on the screen to update, if I clicked any part of the Data Grid View, the following message box popped up: "An unhandled exception of type 'System. Figured I'd share and maybe save somebody some frustration.

The persistent store coordinator handled the nitty-gritty details of inserting the list record into the persistent store.

It's alluded to in a similar post but I didn't quite get the whole gist: .

NET Questions - (C#) updating Data Grid View with a new Data Source Turning autogenerate off didn't work for me. Additional information: Index -1 does not have a value."" I started having this same exact problem when I tweaked my code some and after studying what changes brought about the error I believe that it has to do with assigning your Data Grid View. As long as you make sure that that doesn't happen, you should be fine.

This is modification can be explained by reference parameter being passed to a method and getting modified there. It is a bad practice and could lead to really confusing code.

His answer will work as long as the class you're dealing with is a reference type (like a class).

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At the very least, maybe it will help someone else who got stumped like I did. (2) When I finally got data on the screen to update, if I clicked any part of the Data Grid View, the following message box popped up: "An unhandled exception of type 'System. So, I still have a few questions about this whole thing, but to start with, am I missing the obvious?!

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