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Those methods perform the change tracking that's needed for updating the data source.If you call the Remove At collection on the Rows property, the deletion won't be communicated back to the database. When you merge datasets, new records in the source dataset are added to the target dataset.If you're familiar with Table Adapters, you can jump directly to one of these topics: Updating a data source is a two-step process.The first step is to update the dataset with new records, changed records, or deleted records.Net: You are trying to use a reference variable who’s value is Nothing/null.When the value is Nothing/null for the reference variable, that means it is not actually holding a reference to an instance of any object that exists on the heap. Net, you are trying to access a string that has not been initialized. You can’t even compile code like the following in C# Remember, a string is a reference type (a character array) that has to have a value.Because datasets maintain multiple versions of records, it's important to keep in mind that more than one version of the records is being merged.
If you create and drop your objects within each method, this isn’t going to be a problem, and you are actually following a better guideline by creating at the last necessary moment, and destroying at the first possible moment, not to mention avoiding possible exceptions like Invalid Reference Exception.If you aren't using data binding, and are saving changes for related tables, you have to manually instantiate a variable of the auto-generated Table Adapter Manager class, and then call its Udpate All method.Two-stage update process and the role of the Data Row Version in a successful update A dataset contains collections of tables, which contain a collections of rows.Every once in awhile, you come across this exception: System.
Null Reference Exception – “Object reference not set to an instance of an object.” You see people asking about this everywhere; about why are they getting this error. Note, regardless of the scenario, the cause is always the same in .
If you intend to update an underlying data source later, you must use the methods on the Data Table.