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The Sql Data Adapter opens a connection only when required and closes it as soon as it has performed its task.For example, the Sql Data Adapter performs the following tasks when filling a Data Set with data: In between the Fill and Update operations, data source connections are closed and you are free to read and write data with the Data Set as you need.After spending some time researching the subject here is the best way I have found to deal with the issue. We have 2 Data Sets and we need to merge them together. First you need to setup your connection.string Connection String = "server=" _Database Server ";user id=" User Name ";password=" Password "; Trusted_Connection=no;connection timeout=30"; Establish your connection Connection = new Sql Connection(Connection String); Connection. The problem is that when you Fill your Data Set by default it sets all Rows to a Row State of No Change.

To save data to the data source, you need to call the Data Adapter's Update method. I'll display the result of the Customers table in a Data Grid after adding, updating, and deleting data from the table.Data Sets only hold data and do not interact with a data source.It is the Sql Data Adapter that manages connections with the data source and gives us disconnected behavior.For example, if you call Delete on a row on the Data Set, then when Update is called on the Data Adapter, the Delete Command of the Data Adapter will be called using the particular row in the Data Set.Note: Keep in mind that this Update is different than a SQL UPDATE statement.