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When a data reader returns a value from a data source, the resulting value is retrieved and stored locally in a .NET type rather than the original data source type. This in-place type conversion feature is a trade-off between consistency and speed, so to give some control over the data being retrieved, the data reader exposes typed accessor methods that you can use if you know the specific type of the value being returned. Typed accessor methods all begin with Get, take an ordinal index for data retrieval, and are type safe; VB won t allow you to get away with unsafe casts. These methods turn out to be faster than both the ordinal and the column name indexer methods. Being faster than column name indexing seems only logical, as the typed accessor methods take ordinals for referencing; however, we need to explain how it s faster than ordinal indexing. This is because even though both techniques take in a column number, the conventional ordinal indexing method needs to look up the data source data type of the result and then go through a type conversion. This overhead of looking up the schema is avoided with typed accessors. .NET types and typed accessor methods are available for almost all data types supported by SQL Server and OLE DB databases. Table 7-1 should give you a brief idea of when to use typed accessors and with what data type. It lists SQL Server data types, their corresponding .NET types, .NET typed accessors, and special SQL Server specific typed accessors designed particularly for returning objects of type System.Data.SqlTypes.
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Creating the GeoCoordinateWatcherDemo Project
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CHAPTER 3: Media Playback
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CHAPTER 1: Getting Started
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CHAPTER 7 DATABASE BACKUPS, RECOVERY, AND MAINTENANCE
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Downloading the proper simulator files for the devices you plan to run on is essential, because different types of devices will have different screen sizes and input modes. Even if you have two devices with the same model number, they will behave differently depending on what software version they are running. Simulators are not just important for testing on the computer, though. They also contain essential information for debugging on the actual device. If you have the physical device you will be using, find the device software version by visiting Options, then About. You will be looking for a version that matches all parts of the version number. For example, if your device has version 4.5.0.81, only use 4.5.0.81, not another version that starts with 4.5.0. You can download simulator packs from the BlackBerry web site. The exact location will change, so your best bet is to visit the Developers page and look around for the BlackBerry Smartphone Simulators. You will see many, many choices. Pick the one that matches your exact version number and device model and, if applicable, carrier. You ll need to click through another web
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5 9. Receiving Untyped Messages
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TcpClientChannel Class
FlowDecision
CHAPTER 3: Active Directory
Remoting and RPC...................................................................................................................................249 Data Services Architecture ...................................................................................................................250 It s a Web Application ...........................................................................................................................251 Protocols, Channels, Destinations, and Endpoints .............................................................................252 Installing a Data Service .......................................................................................................................253 Calling Remote Methods and Serializing Objects ...............................................................................257 Extending Data Services for Advanced Remoting Use Cases...........................................................272 Messaging and Real-time Updates........................................................................................................274 Essential Messaging and Pushing Data ..............................................................................................274 Writing Custom Message Adapters......................................................................................................282 Advanced Issues in Messaging............................................................................................................282 Using Server-side Proxies ......................................................................................................................284 Additional Useful Data Services Tips ...................................................................................................285 Configuring at Run Time .......................................................................................................................285 Application Security...............................................................................................................................285 Summary ...................................................................................................................................................286
Introducing Microsoft Azure and SQL Azure
class Program { static void Main(string[] args) { Console.Title = "Daily Vendor PO Summary Report"; LocalReport rpvVendorPO = new LocalReport(); //declare connection string string cnString = "Data Source=(local);Initial Catalog=RealWorld; Integrated Security=SSPI;"; //declare Connection, command and other related objects SqlConnection conReport = new SqlConnection(cnString); SqlCommand cmdReport = new SqlCommand(); SqlDataReader drReport; DataSet dsReport = new dsVendorPO(); try { //open connection conReport.Open(); //prepare connection object to get the data through reader and //populate into dataset cmdReport.CommandType = CommandType.Text; cmdReport.Connection = conReport; cmdReport.CommandText = "SELECT * FROM tblVendorPO ORDER BY PurchaseOrderID"; //read data from command object drReport = cmdReport.ExecuteReader(); //load data directly from reader to dataset dsReport.Tables[0].Load(drReport); //close reader and connection drReport.Close(); conReport.Close(); //provide local report information to viewer rpvVendorPO.ReportEmbeddedResource = "VendorPO.rptVendorPO.rdlc"; //setup report parameter to pass vendor name ReportParameter[] Param = new ReportParameter[1]; Param[0] = new ReportParameter("parVendorName", "ABCD1234 Inc.");
NOTE
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