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So, when you discover that you cannot perform another operation on the existing connection, what should you do Simply open another connection I suggest you rethink your application strategy Consider the following scenario Your application has opened a connection and executed a query, which returns a rowset as a DataReader In an attempt to save time and resources, you ve decided not to create and populate a memory-resident DataTable (or DataSet) To implement your decision, you execute a query and ADONET supplies a SqlDataReader, which is a pipe to the rowset While processing the DataReader row by row, you determine that some changes are needed in the database based on a row s data values At this point you discover that you can t reuse the DataReader object s connection to make the change, so you re tempted to open another connection or somehow figure out how MARS works.

file name (path to desktop as string) & "ABG Bookxlsx" set the name of sheet "Sheet1" of abook to "Sales" make new worksheet at end of active workbook with properties {name:"Results"} end tell

Can you see the problem here Because you re using SQL Server (and not some toy database), it makes a lot more sense to perform this type of operation on the server After all, SQL Server is a service designed to manage database operations In this case, I would recommend that you write a stored procedure to make these changes in place And no, I m not suggesting that you build a cursor in a stored procedure to walk through and edit the rows In many cases row-by-row operations can be performed by a simple (and sometimes not-so-simple) UPDATE statement with far better performance Why don t developers do this in the first place Well, some are uncomfortable with more than basic T-SQL operations My suggestion in this case is to get familiar with T-SQL and stored procedures and learn how to leverage the server-side power of SQL Server.

(c) 887 m (d) 284 m 19 What is the fourth harmonic of 800 kHz (a) 200 kHz (b) 400 kHz (c) 320 MHz (d) 400 MHz 20 Suppose you want to build a 1 2-wave dipole antenna designed to have a fundamental resonant frequency of 360 MHz How long should you make it, as measured from end to end in feet (a) 130 ft (b) 1680 ft (c) 397 ft (d) 515 ft

Consider that any number of scenarios resemble the one I described previously That said, some situations require multiple connections, but before your application charges off to open a second connection (or even consider MARS) I suggest you.

workbook (the workbook is active because you just opened it), giving it the name Results, as shown in boldface here:

reconsider what the application is trying to accomplish. It usually makes a lot of sense to complete rowset population as quickly as possible to free up server-side resources being consumed by your connection. This means leveraging the TableAdapter Fill or DataTable Load methods to construct or load a memory-resident DataTable with the selected rowset(s).

system Transformers can also match impedances between a circuit and a load, or between two different circuits Transformers can be used to provide dc isolation between electronic circuits while letting ac pass Another application is to mate balanced and unbalanced circuits, feed systems, and loads

tell the application "Microsoft Excel" set abook to open workbook workbook file name (path to desktop as string) & "ABG Bookxlsx" set the name of sheet "Sheet1" of abook to "Sales" make new worksheet at end of active workbook with properties {name:"Results"} end tell

Rowset population is the process of bringing the entire selected rowset to the client. Doing so frees any pending locks on the data rows, pages, and extents on the server. It can also free your connection for additional operations by your application (or others) needing SQL Server resources your application might be holding.

Although you have little control over some parts of SQL Server query processing, there are other aspects of application implementation where you can manage to improve performance These include limiting the number of demands your application makes on the server as well as the quality or intelligence of these requests Most data access developers agree that it s not only the number of server requests, but the intelligence of them that makes a difference between an application that can support 100 users and one that can support thousands Each time you execute a query or perform a data definition language (DDL) operation, the client-side data access provider (typically implemented by ADONET s SqlClient namespace) must build a set of TDS packets, hook up the connection, pass the query to the server, and process the result sets as they are made available by SQL Server.

6 Add a save command to save abook, as shown in boldface here: