connecting to a sql database in asp net

... ADO .NET automatically stores database connections in a pool. Connection pooling offers a great performance improvement because you don't have to wait for a brand new connection to the database ... illustrates how to use a SqlConnection object to connect to a SQL Server database */ using System; using System.Data; using System.Data.SqlClient; class MySqlConnection { public static ... static void Main() { // formulate a string containing the details of the // database connection string connectionString = "server=localhost ;database= Northwind;uid=sa;pwd=sa";...

Ngày tải lên: 07/11/2013, 10:15

... StateChangeEventArgs class. The following example defines a method named StateChangeHandler to handle the StateChange event. You'll notice that the second parameter to this method is a StateChangeEventArgs ... closed. Connecting The Connection is establishing access to the database. Executing The Connection is running a command. Fetching The Connection is retrieving information from the database. Open ... StateChange event. Listing 7.3: STATECHANGE.CS /* StateChange.cs illustrates how to use the StateChange event */ using System; using System.Data; using System.Data.SqlClient; class...

Ngày tải lên: 14/12/2013, 13:15

... Team LiB ] Recipe 1.7 Connecting to a Named Instance of SQL Server or Microsoft Data Engine (MSDE) Problem You want to connect to a named instance of a SQL Server or Microsoft Data Engine ... ConfigurationSettings.AppSettings[" ;Sql_ Msde_ConnectString"]); Manager and Query Analyzer are also shared. The System.Data.SqlClient class cannot automatically discover the port number of a named instance of SQL Server ... need to understand what a SQL Server or MSDE named instance is and how to connect to one. The sample code contains a single event handler: Connect Button.Click Creates and opens a connection to...

Ngày tải lên: 14/12/2013, 18:16

... attributes in addition to those defined by ADO .NET. To open a database secured by a Microsoft Access database password, use the Jet OLEDB :Database Password attribute in the connection string to specify ... ex.Message); } resultTextBox.Text = result.ToString( ); } Discussion A Microsoft Access database password requires that users enter a password to obtain access to the database and database ... is also known as share-level security. A password does not allow groups or users to have distinct levels of access or permissions. Anyone with the password has unrestricted access to the database. ...

Ngày tải lên: 24/12/2013, 05:15

... Team LiB ] [ Team LiB ] Recipe 1.4 Connecting to a Secured Access Database Problem You want to connect to a Microsoft Access database that has been secured with user-level security and ... defined by ADO .NET. To open a database secured by Microsoft Access user-level security, use the Jet OLEDB:System Database attribute in the connection string to specify the path and filename ... The sample code contains a single event handler: Connect Button.Click Creates and opens a connection to a Microsoft Access database secured with user- level security and a workgroup file using...

Ngày tải lên: 24/12/2013, 05:15

... SP0811_Update Used to update the table TBL0811 with the changes made to the DataSet passed in as an NText input parameter @data. The parameters @data and @datadeleted contain an XML representation ... System.IO; [ Team LiB ] Recipe 8.11 Using a Single Stored Procedure to Update Multiple Changes to a SQL Server Database Problem You need to update a SQL Server 2000 database with changes to multiple ... default value is null which results in the return of a handle to an internal representation to an empty XML document. xpathNamespaces A text parameter that specifies the namespace declarations...

Ngày tải lên: 21/01/2014, 11:20

... Available SQL Servers and Databases Users sometimes need to connect to various databases. An example of this is a large company that might keep its site information in separate databases in ... create a dialog box that lists available SQL Servers and databases and that the user can utilize to connect to a new database? Technique For this How -To, you will be using the base object in ... create a dialog box to let the user pick the SQL Server and database and then create a new connection based on the selections. Within a database application, it is necessary to allow users to...

Ngày tải lên: 21/01/2014, 12:20

... SAMPLE APPLICATION USING ASP. NET AJAX 239 828-8 CH10.qxd 10/11/07 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 ... a call to the DataTier web service to get the DataTable back. The DataTable then loads the graph with the appropriate data. CHAPTER 10 ■ BUILDING A SAMPLE APPLICATION USING ASP. NET AJAX244 828-8 ... the Foundations of ASP. NET AJAX, including a tour of some of the basic principles in devel- oping AJAX-style applications and the unique and powerful approach to this that ASP. NET AJAX gives you....

Ngày tải lên: 05/10/2013, 10:20

... of ASP. NET AJAX. Using ASP. NET AJAX server controls is the easiest and quickest path to implementing AJAX functionality in your ASP. NET application. They are also ideal for when a minimal amount ... learned how to create a new AJAX-enabled ASP. NET site. Alterna- tively, you can just as easily create an AJAX-enabled ASP. NET web application if you have installed the Web Application Project add-on ... Additionally, you looked at the UpdatePanel control, which is at the heart of how ASP. NET AJAX enables AJAX functionality in existing ASP. NET pages using partial-page updates. This chapter gave...

Ngày tải lên: 05/10/2013, 10:20

... data file is the data container for Scott’s ToDo List application and resides in the App_Data folder of the site. You may have to manually add the ASP. NET user of your machine to this database ... sophisticated apps that need logical and physical separation of the data tier that has complex data objects and a data access layer. Summary The ToDo List application is an excellent example of an ASP. NET ... following scenario: You have a data-driven web page that needs to continuously alert the user with fast changing data, for instance, a page that displays the major financial indices in the U.S. capital...

Ngày tải lên: 05/10/2013, 10:20

... We will create a separate pages to insert these records (default.aspx) into database and list,update,delete records (list.aspx) from database. In this application we will have following 4-Tiers ... We will create a separate pages to insert these records (default.aspx) into database and list,update,delete records (list.aspx) from database. In this application we will have following 4-Tiers ... shown above (default.aspx and list.aspx pages). Try manipulating data and see how effectively its happening. This was a simple application, based on this architecture, you can create larger application...

Ngày tải lên: 17/10/2013, 14:15

... in ASP. NET, page-level tracing and application- level tracing. In the lab, students will enable and disable tracing for an ASP. NET page. They will also add custom trace messages to an ASP. NET ... Trace 4 Application-Level Trace 9 Lab 5: Adding Trace to an ASP. NET Page 14 Review 15 Module 5: Using Trace in ASP. NET Pages Module 5: Using Trace in ASP. NET Pages 7 BETA MATERIALS ... will enable and disable tracing for an ASP. NET page. You will also add custom trace messages to an ASP. NET page and a middle-tier component. Module 5: Using Trace in ASP. NET Pages iii...

Ngày tải lên: 05/11/2013, 12:15

... Create a SQL SELECT statement referencing a worksheet or a range in an Excel workbook and execute the statement to fill a DataSet using a DataAdapter or to create a DataReader. For example: ... INSERT INTO [MySheet$] (Field1, Field2, Field3) VALUES ('testdata', 1.234, '09/28/1979'); Retrieve data Use either a DataAdapter or a DataReader to retrieve data from an ... 1-2 . Example 1-2. File: ExcelForm.cs // Namespaces, Variables, and Constants using System; using System.Configuration; using System.Data; private OleDbDataAdapter da; private DataTable...

Ngày tải lên: 14/12/2013, 18:16

... provider can read records from and insert records into a text file data source. The Jet database engine can access other database file formats through Indexed Sequential Access Method (ISAM) drivers ... schema.ini file provides the following schema information about the data in the text file: [ Team LiB ] Recipe 1.19 Connecting to a Text File Problem You want to use ADO .NET to access data ... Namespaces, variables, and constants using System; using System.Configuration; using System.Windows.Forms; using System.Data; using System.Data.OleDb; // . . . // Create the data adapter...

Ngày tải lên: 24/12/2013, 05:15

... file named TNSNAMES.ORA to locate the Oracle database and determine how to connect to it based on the Data Source or Database attribute in the connection string. An example of an entry in the ... to an Oracle database. Solution You can connect to an Oracle database using either the Oracle .NET data provider or the OLE DB .NET data provider. The sample code contains two event handlers: ... Oracle Button.Click Creates and opens a connection to an Oracle database using the Oracle .NET data provider. Information about the database is displayed from the properties of the OracleConnection...

Ngày tải lên: 24/12/2013, 05:15

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