Tài liệu Using ADO NET Design-Time Features in Classes Without a GUI pptx

... constants using System; using System.Data; using System.Data.SqlClient; // . . . public DataTable MyDataTable { get { // Fill a table using the DataAdapter control. DataTable dt ... using the SqlDataAdapter control. Update( ) This method takes a DataTable object argument that uses the SqlDataAdapter control to update changes to the DataTable (retrieved using...

Ngày tải lên: 14/12/2013, 18:16

... Using ADO. NET Databases With the advent of the .NET Framework, Microsoft decided to update its model for accessing databases, ActiveX Data Objects (ADO) , and created ADO. NET. ADO. NET contains ... data retrieved from a database. An application that defines DataSet objects can execute queries that populate them, and then display and update the data that they contain. Inter...

Ngày tải lên: 24/12/2013, 09:16

... is a specialized version of an ADO. NET class, Command, that has been designed for gaining access to SQL Server. A Command object is used to execute a command against a data source. In the case ... System.Data.CommandBehavior parameter that automatically closes the connection used by the SqlDataReader when the SqlDataReader is closed. For example: SqlDataReader dataReader =...

Ngày tải lên: 24/12/2013, 09:16

... Example 6-6. File: DbmsTransactionForm.cs // Namespaces, variables, and constants using System; using System.Configuration; using System.Windows.Forms; using System.Data; using System.Data.SqlClient; ... form. Insert Button.Click Inserts user-entered data for the Categories records into the Northwind database within a manual transaction using a DBMS transacted stored proc...

Ngày tải lên: 21/01/2014, 11:20

... the string expression. Add the DataColumn to the parent DataTable. Generate a DataTable from a DataView Create the original DataTable. Create a new DataView instance, passing the DataTable object ... semi-human-readable format. The DataSet class and the DataTable instances contained within it include features for moving data back and forth between ADO. NET and XML. This chapter...

Ngày tải lên: 17/08/2012, 08:39

... source to a dataset, and back again – a key ability of ADO. NET. Datasets allow us to work with data without remaining connected to the data source. Also, the same DataSet class can handle data retrieved ... offers a way to map column names from the database to the DataSet using the DataTableMapping and DataColumnMapping objects. Usually, mapping classes are really useful whe...

Ngày tải lên: 10/12/2013, 14:15

... Custom IntranetUsers Intranet Intranet IntranetUser IntranetUser Intranet UserGet UserAdd Delete Update UserCustom Primary Keys Every table has a primary key (or at least should have one). A primary ... CustomerAdd depending on whether it’s inside the Intranet database or in a shared/generic database. The procedure to validate the username and password of an intranet user should be...

Ngày tải lên: 12/12/2013, 21:16

... 81 ExecuteScalar 83 Output Parameters, Return Codes, Scalars, and DataReaders 84 DataSet 88 Manually Populating a DataSet 89 Using DataAdapters 89 Using DataReaders 90 DataTable 90 RowState 91 DataView ... 91 Serialization 92 DataTableReader 93 Streaming 93 Namespace Qualified Tables 94 Indexing Engine 94 DataSet, DataTable, DataReader, or an Object? 95 Showing Data to Users without A...

Ngày tải lên: 12/12/2013, 21:16

... contents displayed in VS .NET. Notice that the documentation is displayed directly in VS .NET, rather than in a separate window, as is done when viewing documentation with the .NET SDK. ... search page and the search results returned by a search for WriteLine. When you run the search, the names of the pages that contain your required words are displayed in the Search Res...

Ngày tải lên: 24/12/2013, 01:17