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An Access database is not a file in the same sense as a Microsoft Office Word 2007 document or a Microsoft Office Power Point 2007 slide deck.Instead, a typical Access database is a a collection of tables, plus a set of objects built around those tables — forms, reports, queries, and so on.

This place holder will not necessarily be the same value as what the database will contain. The Unique constraint Unique Constraint Parent Constraints = new Unique Constraint(new Data Column[] ); My Data Set. In that case wrap the below foreach loop in another foreach loop to iterate through each table.foreach (Data Row row in New Data. You have to set preserve Changes to true or the Merge will throw out all your changes and nothing will make it into the new database. Sql Command Builder Parent Command Builder = new Sql Command Builder(Parent Adapter); Sql Command Builder Child Command Builder = new Sql Command Builder(Child Adapter); My Data Set. For more information about message handlers, see Handling messages and system notifications.The way the architecture works with the Data Adapter is that you can make any changes you want to the filled Data Set, and it won't affect the database until you call the Update method.One of the things I have noticed about working with Data Sets is that there is not a lot of information out there on how to work with Foreign Key constraints and merging 2 databases together. That way you have 2 identical Data Sets when you go to merge them together and you can reuse all the same code again. Just repeat the steps above for multiple tables and multiple databases and you can merge as many databases and tables as you need to.Let me rephrase that, there is a but it feels scattered about and I felt it didn't teach me what I needed to know. You don't have to do this if you don't want to as there are ways around it by using Missing Schema Action but I prefer to have identical Data Sets to work from.

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