Lesson Summary in Visual Studio .NET

Encode QR Code 2d barcode in Visual Studio .NET Lesson Summary

Lesson Summary
Drawing QR Code 2d Barcode In .NET Framework
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Encode Barcode In .NET
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A SqlException object is created when an error is detected on the SQL server. Every instance of a SqlException exception contains at least one SqlError warn ing that contains the actual error information from the server.
Generate QR Code 2d Barcode In Visual C#
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Painting QR Code In .NET
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5
Printing QR Code JIS X 0510 In Visual Basic .NET
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Universal Product Code Version A Generation In .NET
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Configuring Connections and Connecting to Data
Code-39 Creator In .NET Framework
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Denso QR Bar Code Creation In Visual Studio .NET
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Lesson Review
Data Matrix 2d Barcode Creator In .NET
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Making Bar Code In Visual Studio .NET
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The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
UPC - 13 Printer In .NET Framework
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Encoding OneCode In VS .NET
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NOTE
PDF-417 2d Barcode Recognizer In Visual Studio .NET
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Denso QR Bar Code Printer In None
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Answers
Encoding GS1-128 In None
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Answers to these questions and explanations of why each choice is right or wrong are located in the Answers section at the end of the book.
Code128 Reader In Java
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1. What types of errors will cause a SqlConnection object to close (Choose all that apply.) A. Errors wth a severity level of 1 through 9 B. Errors wth a severity level of 10 through 19 C. Errors wth a severity level of 20 through 29 D. Errors wth a severity level of 30 or greater 2. What property contains the actual error message returned by SQL Server (Choose all that apply.) A. SqlException.Source B. SqlException.Message C. SqlError.Class D. SqlError.Message
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GTIN - 12 Creator In None
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Lesson 5: Enumerating the Available SQL Servers on a Network
Lesson 5: Enumerating the Available SQL Servers on a Network
This lesson describes how to return a list of visible SQL Server instances on a network comparable to the Server name drop-down list in the Add Connection dialog box.
After this lesson, you will be able to:
Enumerate through instances of SQL Server.
Estimated lesson time: 20 minutes
The .NET Framework offers applications a way to discover SQL Server instances on a network so your programs can process this information when necessary. To retrieve the list of available SQL Servers, use the Instance property of the SqlDataSourceEnumerator class and call the GetDataSources method. The GetDataSources method returns a DataTable that contains information for each SQL server that is visible on the network. The returned data table contains the columns listed in Table 5-11.
Table 5-11 Table 5-11 DataTable Schema Returned by the GetDataSources Method
Column Name ServerName InstanceName IsClustered Version
Description Name of the SQL server containing the visible instance Name of the server instance or empty for servers running default instances Indicates whether the server is part of a cluster The version number of the SQL server
Why Do Only Some or No SQL Servers Appear in My Grid
Depending on how your network or even single machine is set up, the list of available servers may or may not be complete. In addition to things such as network traffic and timeout issues, the way your network implements security can cause servers to be hid den from the returned list as well. If you are running SQL Server 2005, there is a ser vice named SQL Browser that needs to be running to see SQL Server instances. And even if your SQL Browser service is running, your firewall may be blocking the request for SQL information; the firewall is likely to be blocking communication requests through port 1433, which is the default port that SQL Server default instances are set
5
Configuring Connections and Connecting to Data
up to use. There are obvious security implications concerning turning on the SQL Browser service, as well as enabling communications through specific ports through your firewall, but these are beyond the scope of this book. A good resource is the SQL Browser service section of SQL Books Online, and I encourage you to read that before changing any settings on your firewall or SQL Server configuration.
Lab: Returning the List of Visible SQL Servers
In this lab you will practice enumerating the SQL Servers on your network.
Exercise 1: Enumerating the SQL Servers on a Network
To demonstrate how to retrieve the list of visible SQL servers, let s create a small appli cation to display the information returned from the GetDataSources method in a DataGridView. 1. Create a new Windows application named SqlServerEnumerator. 2. Add a DataGridView to the form and name it VisibleSqlServers.
NOTE
DataGridView
The DataGridView is the control typically used for displaying data. The DataGridView is dis cussed in more detail in 8.
3. Add a Button control below the grid and set its Name property to GetDataSourcesButton. 4. Set the Button s Text property to Get Visible Servers. 5. Double-click the Get Visible Servers button to create the Click handler and switch to code view. 6. Add code so that the handler looks like the following: ' VB
Dim instance As System.Data.Sql.SqlDataSourceEnumerator = _
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