C# 4 and .NET 4

974 ❘ ChaPTer 34 .net prOGrAmminG with sQl server
}
}
@"server=(local);database=ProCSharp;trusted_connection=true";
var connection = new SqlConnection(connectionString);
var command = connection.CreateCommand();
command.CommandText = "SELECT Id, Number, Info FROM Exams";
connection.Open();
var reader = command.ExecuteReader(CommandBehavior.CloseConnection);
while (reader.Read())
{
SqlXml xml = reader.GetSqlXml(2);
XmlReader xmlReader = xml.CreateReader();
StringBuilder courses = new StringBuilder("Course(s): ", 40);
while (xmlReader.Read())
{
if (xmlReader.Name == "Exam" && xmlReaderIsStartElement())
{
Console.WriteLine("Exam: {0}", xmlReader.GetAttribute("Number"));
}
else if (xmlReader.Name == "Title" && xmlReader.IsStartElement())
{
Console.WriteLine("Title: {0}", xmlReader.ReadString());
}
else if (xmlReader.Name == "Course" && xmlReader.IsStartElement())
{
courses.AppendFormat("{0} ", xmlReader.ReadString());
}
}
xmlReader.Close();
Console.WriteLine(courses.ToString());
Console.WriteLine();
}
reader.Close();
Running the application, you will get the output as shown:
Exam: 70-502
Title: TS: Microsoft .NET Framework 3.5, Windows Presentation Foundation Application Development
Course(s): 6460
Exam: 70-562
Title: TS: Microsoft .NET Framework 3.5, ASP.NET Application Development
Course(s): 2310 6463
Exam: 70-561
Title: TS: Microsoft .NET Framework 3.5, ADO.NET Application Development
Course(s): 2310 6464
Instead of using the XmlReader class, you can read the complete XML content into the XmlDocument
class and parse the elements by using the DOM model. The method SelectSingleNode() requires an
XPath expression and returns an XmlNode object. The XPath expression //Exam looks for the Exam XML
element inside the complete XML tree. The XmlNode object returned can be used to read the children of the
represented element. The value of the Number attribute is accessed to write the exam number to the console,
then the Title element is accessed and the content of the Title element is written to the console, and the
content of all Course elements is written to the console as well:
string connectionString =
@"server=(local);database=SqlServerSampleDB;trusted_connection=true";
var connection = new SqlConnection(connectionString);
var command = connection.CreateCommand();
command.CommandText = "SELECT Id, Number, Info FROM Exams";
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