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Several of the examples in the NET Software Development Kit (SDK) build up rows of data using loops to generate values, which is handy for examples, but in general, you ll probably end up using a DataAdapter to fill a DataTable once you ve created it You should know the following about using Fill() in this situation: If you call Fill() on a DataTable with no columns, as you did in the earlier Iterating Through a DataSet section, the DataTable will be filled with the data from the table, and none of the extra details that you added in the last example none of the DataTable schema definition will be created The Fill() method will assign each column in the DataTable a name and data type as best it can from the columns in the query results it s storing.

Override one or more AsyncTask methods to accomplish the background work, plus whatever work associated with the task that needs to be done on the UI thread (e.g., update progress). When needed, create an instance of the AsyncTask subclass and call execute() to have it begin doing its work. What you do not need to do is: Create your own background thread. Terminate that background thread at an appropriate time. Call all sorts of methods to arrange for bits of processing to be done on the UI thread.

However, properties such as AllowDBNull and ReadOnly will remain at their defaults, and the PrimaryKey for the table won t be set In contrast, if you call Fill() on a DataTable whose details you ve defined, as you have in this example, the DataAdapter will try to match DataColumn names with column names in the query results and fill in the values accordingly If it can t match a column name with a DataColumn, it will create a new DataColumn with the same name as the column and use that instead Make sure that the column and DataColumn names match up, or use aliases in your SQL query That said, one version of Fill() you didn t try earlier allows you to specify a subsection of the results from a query to add to a DataTable.

$ svn copy file:///path/to/repos/tags/0.9-release \ file://path/to/repos/branches/my-development-branch \ -m "create development branch from version 0.9 tag"

This fits in nicely with the problem you now have with the DataTable copy of the Manufacturer table in FillManufacturerTable () Using code to create the first two rows manually means that the versions of Fill() you ve used so far would try to duplicate those two rows if you called them now Moreover, this would cause an error because values in the primary key column would be duplicated, which isn t allowed You first need to create the Command and DataAdapter objects that return the information: // create the Command and DataAdapter SqlDataAdapter ManufacturerAdapter = new SqlDataAdapter(); SqlCommand ManufacturerCommand = new SqlCommand( "SELECT * FROM Manufacturer ORDER BY ManufacturerID", conn); ManufacturerAdapterSelectCommand = ManufacturerCommand; This new version of Fill() allows you to say which row in the results you start filling from and how many rows you want to add to the DataTable.

Creating a subclass of AsyncTask is not quite as easy as, say, implementing the Runnable interface. AsyncTask uses generics, and so you need to specify three data types: The type of information that is needed to process the task (e.g., URLs to download) The type of information that is passed within the task to indicate progress The type of information that is passed when the task is completed to the post-task code What makes this all the more confusing is that the first two data types are actually used as varargs, meaning that an array of these types is used within your AsyncTask subclass. This should become clearer as we work our way toward an example.

The first parameter identifies the DataSet you re working with, the second is the index number of the row in the results of the SelectCommand to start filling with, and the third is the number of rows (with 0 meaning all), to add to the DataTable, which is identified by the fourth parameter // fill the DataTable ManufacturerAdapterFill(dset, 2, 0, "Manufacturer"); } Note that the SelectCommand still retrieves all the rows from the Manufacturer table, even though you don't use the first two If you wanted to retrieve only the seven rows required, you would need to alter the SELECT query rather than use this variant of Fill()..

[ ... do some work, make some changes, commit them to the branch ... ]