refreshing a dataset automatically using extended properties

... Team LiB ] Recipe 9.14 Refreshing a DataSet Automatically Using Extended Properties Problem You need to automatically refresh a DataSet periodically. Solution Use extended properties and ... second, and a period of one second. Update Button.Click Uses a DataAdapter to update changes made to the first DataTable back to the data source. CheckRefreshDataSet( ) This method is called ... database. The default view of the table is bound to a data grid on the form. A second DataTable with the auto -refreshing functionality is created that also contains the Categories table from the...

Ngày tải lên: 14/12/2013, 18:16

... Creating a DataSet Object Using Visual Studio .NET In this section, you'll learn how to create a DataSet using Visual Studio .NET. N ote You'll find a completed VS .NET example ... form, and add code to your form to fill it using the Fill() method of a DataAdapter object. • Click the Generate Dataset link at the bottom of the Properties window of your DataAdapter. You can ... You'll use the second step, so go ahead and click the Generate Dataset link. The Generate Dataset dialog box is then displayed, as shown in Figure 10.14 . Figure 10.14: The Generate Dataset...

Ngày tải lên: 21/01/2014, 07:20

... it again. The DataSet in this case is referred to as a disconnected DataSet as it doesn't maintain an active connection to the database. Disconnected DataSet objects act as a data cache ... Performing Updates by Using a DataSet The changes made by using the DataGridView control are automatically copied back to the DataSet acting as the data source for the control. Saving changes made to ... time. Instead, a better approach is to connect to the database, fetch the data into a DataSet object, and then disconnect again. The user can browse the data in the DataSet and make any changes...

Ngày tải lên: 15/12/2013, 00:15

... You can push these changes to the database using the following example: mySqlDataAdapter.Update(myDataSet); All your changes to myDataSet are pushed to the database as part of the transaction ... Each of the Command objects in mySqlDataAdapter will now use mySqlTransaction. Let's say you added, modified, and removed some rows from a DataTable contained in a DataSet named myDataSet. ... mySqlTransaction. Note A transaction is rolled back by default; therefore, you should always explicitly commit or roll back your transaction using Commit() or Rollback() to make it clear what...

Ngày tải lên: 24/12/2013, 01:17

... "ORDER BY CustomerID"; SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter(); mySqlDataAdapter.SelectCommand = mySqlCommand; DataSet myDataSet = new DataSet( ); mySqlConnection.Open(); ... Chapter 16 , " ;Using SQL Server's XML Support." Using the WriteXml() Method Let's say you have a DataSet object named myDataSet. Assume that myDataSet has a DataTable that ... "ORDER BY CustomerID"; SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter(); mySqlDataAdapter.SelectCommand = mySqlCommand; DataSet myDataSet = new DataSet( ); mySqlConnection.Open();...

Ngày tải lên: 24/12/2013, 01:17

Ngày tải lên: 21/01/2014, 07:20

Ngày tải lên: 21/01/2014, 11:20

Ngày tải lên: 21/01/2014, 11:20

Ngày tải lên: 26/01/2014, 10:20

Ngày tải lên: 26/01/2014, 10:20

... parity and data are distributed in all. If one hard disk fails, data on that can be regenerated by the data and parity information in the other two hard disks. ###RAID### Raid 5 :need 3 disks Raid ... point http://helpinlinux.blogspot.com/search/label/storage How to create a Raid Device using madadm in linux rhel5 with level 5, 0 and 1 The following article explains what is Raid, what are important levels and how to install and configure a raid device ... is mainly used for data protection. It protects our data storage from failures and data loss. All storage units now use raid technology. It has following uses. 1. Data protection 2. Increasing...

Ngày tải lên: 19/09/2012, 09:21

... above a line tangential to the supraorbital margin (horizontal line). Frontal sinus aplasia is also defined by an oval-shaped sinus with the lateral margin medial to a vertical line drawn through ... indicating the optimized center of the re- construction area. In addition, the head position was adjusted in such a way that the hard palate was par- allel to the floor, while the sagittal plane ... Frontal sinus aplasia was also defined by an oval-shaped sinus with the lateral margin medial to a vertical line drawn through the middle of the orbit (vertical line) with a smooth superior margin...

Ngày tải lên: 25/10/2012, 11:04

Ngày tải lên: 05/09/2013, 08:40

Ngày tải lên: 05/09/2013, 16:30

... 10:47 AM Page 239 226 CHAPTER 10 ■ BUILDING A SAMPLE APPLICATION USING ASP.NET AJAX Figure 10-1. An ASP.NET AJAX-based stock application Understanding the Application Architecture The application ... you looked at a real-world application and how you would implement it as an AJAX applica- tion quickly, simply, and powerfully using ASP.NET AJAX. CHAPTER 10 ■ BUILDING A SAMPLE APPLICATION USING ASP.NET ... have added AJAX capabilities to this application, and the page will not blink as it obtains data and renders the updates. You can see that there is no explicit coding for a partial-page update...

Ngày tải lên: 05/10/2013, 10:20

... interface even though a specific router may contain one. An example of this might be an ISDN BRI interface. The string in parenthesis is the legal abbreviation that can be used in IOS command ... a password, enter class. If “class” does not work, ask the instructor for assistance. Router>enable At the privileged EXEC mode, enter the command erase startup-config. Router#erase startup-config ... session as performed in the Establishing a HyperTerminal session lab. Note: Go to the erase and reload instructions at the end of this lab. Perform those steps on all routers in this lab assignment...

Ngày tải lên: 04/11/2013, 16:15

... You can use this table [ Team LiB ] Recipe 5.3 Converting a DataReader to a DataSet Problem You need to transfer data from a DataReader to a DataSet. Solution Create a DataTable schema ... (DataColumn[])pkCols.ToArray(typeof(DataColumn)); // Add the table to the DataSet. ds.Tables.Add(dataTable); object[] aData = new object[dataTable.Columns.Count]; // Read all rows from the DataReader. ... DataReader. while(dr.Read( )) { // Read the row from the DataReader into an array. dr.GetValues(aData); // Add the row from the array to the DataTable. dataTable.Rows.Add(aData); } } }...

Ngày tải lên: 07/11/2013, 13:15

Ngày tải lên: 28/11/2013, 21:14

Ngày tải lên: 28/11/2013, 21:19

... of the DataSet. 7. Repeat steps 3-6 for each table in the DataSet. 8. Create a data relationship between two related tables in the DataSet by using the Add( ) method of the DataRelationCollection ... BuildDataSetProgramaticallyForm.cs // Namespaces, variables, and constants using System; using System.Configuration; using System.Data; using System.Data.SqlClient; // . . . // Create the DataSet. DataSet ... Team LiB ] Recipe 2.2 Building a DataSet Programmatically Problem You want to build a DataSet programmatically—including adding tables, columns, primary keys, and relations—from a schema...

Ngày tải lên: 14/12/2013, 18:16