Tài liệu Adding, Updating, and Deleting Related Rows In this section, you''''''''ll learn how to make changes in docx

... Adding, Updating, and Deleting Related Rows In this section, you'll learn how to make changes in DataTable objects that store rows from the Customers and Orders tables. ... previous code in the Main() method. Pushing Changes in customersDT and ordersDT to the Database In this section, you'll learn how to push the changes pr...

Ngày tải lên: 24/12/2013, 01:17

... DataRow customerDR = customerDRV.Row; Modifying an Existing DataRowView To begin modifying an existing DataRowView in a DataView, you call the BeginEdit() method of the DataRowView in your DataView. ... customersDV[2].Delete(); // call the AcceptChanges() method of customersDT to // make the deletes permanent in customersDT customersDT.AcceptChanges(); // display...

Ngày tải lên: 24/12/2013, 01:17

... commands by trapping menu events and executing code in much the same way as you do for handling control events. Creating a Menu In the following exercise, you will use the graphical approach to ... method and refresh your memory.) 5. You now need to enable the Save Member and Print menu items to allow the user to save and print the current member's information. Yo...

Ngày tải lên: 26/01/2014, 12:20

... Finding, Filtering, and Sorting Rows in a DataTable Each row in a DataTable is stored in a DataRow object, and in this section you'll learn how to find, filter, and sort the ... string Cha% is placed in single quotes, which you must do for all string literals. Note You can also use a DataView object to filter and sort rows, and you'll learn...

Ngày tải lên: 14/12/2013, 13:15

... can find, filter, and sort DataRow objects in a DataTable. You'll learn how to do that later in the section "Finding, Filtering, and Sorting Rows in a DataTable." Tip Adding ... null value-which you store in the AllowDBNull property of the DataColumn. • Any auto-increment information-which you store in the AutoIncrement, AutoIncrementSeed, and Aut...

Ngày tải lên: 24/12/2013, 01:17

... true ); One thing to keep in mind when adding constraints to a DataTable is that it knows only about the rows you store in it; it doesn't know about any other rows stored in the actual ... adding constraints to the DataTable objects. Next, you'll see how to add restrictions to DataColumn objects. Adding Restrictions to DataColumn Objects In this sec...

Ngày tải lên: 24/12/2013, 01:17

... value must be unique-which is stored in the Unique property. • Any auto-increment information-which is stored in the AutoIncrement, AutoIncrementSeed, and AutoIncrementStep properties. The FillSchema() ... Console.WriteLine("myDataColumn.AutoIncrementSeed = " + myDataColumn.AutoIncrementSeed); Console.WriteLine("myDataColumn.AutoIncrementStep = " + myDataC...

Ngày tải lên: 24/12/2013, 01:17

... 4.5 Adding Parent/Child Rows with Auto-Incrementing Keys Problem You want to insert related parent/child rows into a DataSet where the primary key of the parent table is an automatically incrementing ... {null, (int)parentRow[PARENTID_FIELD], Guid.NewGuid().ToString(), Guid.NewGuid().ToString( )}); } } Discussion The example adds a single row to the parent table and a ra...

Ngày tải lên: 21/01/2014, 11:20

... exit. Homework: 1 .Learn by heart the new words. 2 .Make and respond 3 situations to: requests, offers and promises HT-LQD The first aid for this situation - Try to stop bleeding by letting him stand straight ... HT-LQD What is happening to this boy?  He s having a nose bleed.’ Practice the first aid for him Student 1: Play the role of this boy. Student 2: Tell the steps...

Ngày tải lên: 24/11/2013, 11:11

... have to use a Tài Liệu Dùng Kèm SGK 12 By giao su p 1 S + MODAL + V0 Would, can, will, must , Unit 10 – ENDANGERED SPECIES Language focus don’t have to Need + To V0 ≠ don’t need to V0) Need ... hard. • MODAL in the PASSIVE: MODALS ở dạng bị động. Example : 1. Humans must keep water, air, and land clean  Water, air, and land must be kept clean . 2. Governments must st...

Ngày tải lên: 27/11/2013, 10:11