By Bill Hamilton
Deals 153 recommendations, whole with code and motives, to difficulties in general encountered whilst utilizing ADO.NET to aid info entry in loosely coupled n-tier program architectures. The options reveal tips on how to hook up with info resources from ADO.NET, retrieve info utilizing SQL statements, look for documents in perspectives and tables, reproduction information among ADO.NET sessions, bind facts to varieties, and increase program functionality. The code examples are written in C#.
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Extra info for ADO.NET Cookbook
NET to access data stored in a text file. Solution Use the OLE DB Jet provider to access data in a text file. txt, shown in Example 1-13, into a 57 58 DataTable and displays the contents in a data grid on the form. Example 1-13. txt "CategoryID","CategoryName","Description" 1,"Beverages","Soft drinks, coffees, teas, beers, and ales" 2,"Condiments","Sweet and savory sauces, relishes, spreads, and seasonings" 3,"Confections","Desserts, candies, and sweet breads" 4,"Dairy Products","Cheeses" 5,"Grains/Cereals","Breads, crackers, pasta, and cereal" 6,"Meat/Poultry","Prepared meats" 7,"Produce","Dried fruit and bean curd" 8,"Seafood","Seaweed and fish" The C# code is shown in Example 1-14.
SqlClient; private SqlConnection conn; // . . NET data providers. NET data provider are described in Table 1-6. Table 1-6. SQL Server connection string pooling attributes Attribute Connection Lifetime 52 Description Length of time in seconds after creation after which a connection is 53 destroyed. The default is 0 indicating that connection will have the maximum time-out. Specifies whether the connection is reset when removed from the pool. The default is true. Specifies whether the connection is automatically enlisted in the current transaction context of the creation thread if that transaction context exists.
OLE DB Resource pooling configuration is controlled using registry entries. There is no user interface to configure these entries the registry must be edited directly. The registry entries are identified by the
ADO.NET Cookbook by Bill Hamilton