By Mahesh Chand
Being a programmer for years, yet new to the ADO / .NET setting, this booklet used to be beneficial. i admire how it used to be designed. It was once effortless to stick with.
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Extra info for A Programmer's Guide to ADO .NET in C#
Listing 4-1. SqlConnection(); ... // more code ... } } Do a search for the ConnectionString by hitting Ctrl+F to bring up the search dialog box. ConnectionString = “data source=(local);initial catalog” + “=Northwind;persist security info=False;user id” + “=mahesh;workstation id=7LJML01;packet size=4096”; It also sets the CommandText property of the SqlCommand with the corresponding SELECT, INSERT, UPDATE, and DELETE SQL statements. sqlConnection1; If you examine the Listing 4-2, you’ll see that DataAdapter is connected to a Connection through data commands, and the TableMapping property is responsible for mapping tables and their columns.
You can change dataset columns by editing the column itself. Of course, you can’t change source columns, but you can reorder them by using the column drop-down list. 38 183 933ch4 3/20/02 11:03 AM Page 184 Chapter 4 Figure 4-31. Table Mappings dialog box By using this dialog box, you can even delete columns from your mapping using the Delete button. Step 4: Reviewing Other Options If you look closely at data adapter properties, you’ll see three links: Configure Data Adapter, Generate Dataset, and Preview Data (see Figure 4-32).
Turning this option off will remove the Select statement. You had to uncheck this for the OleDb adapter or else Insert and Update don’t work. This isn’t true, however, for the SqlServer adapter. NET Clicking Next brings up the results screen. As you can see in Figure 4-43, the Data Adapter Configuration Wizard has done quite a bit of work! It’s generated all of the commands for the adapter, all of the mappings, and, although not indicated, all of the parameters. Figure 4-43. View Wizard Results page of the Data Adapter Configuration Wizard If you examine the form designer, you’ll see the wizard added two components to your form: oleDbConnection1 and oleDbDataAdapter1.