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The Data property of System.Exception is new to .NET 2.0, and allows you to fill an exception object with any additional relevant bits of information (such as a time stamp or what have you). The Data property returns an object implementing an interface named IDictionary, defined in the System. Collection namespace. 9 examines the role of interface-based programming as well as the System.Collections namespace. For the time being, just understand that dictionary collections allow you to create a set of values that are retrieved using a specific key value. Observe the next relevant update to the Car.Accelerate() method: ' See if Car has overheated. Public Sub Accelerate(ByVal delta As Integer) If carIsDead Then Console.WriteLine("{0} is out of order...", petName) Else currSpeed += delta If currSpeed >= maxSpeed Then carIsDead = True currSpeed = 0 ' We need to call the HelpLink property, thus we need to ' create a local variable before throwing the Exception object. Dim ex As New Exception(String.Format("{0} has overheated!", petName)) ex.HelpLink = "http://www.CarsRUs.com" ' Stuff in custom data regarding the error. ex.Data.Add("TimeStamp", _



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Left)" To="500" Duration="0:0:10"> </DoubleAnimation> <DoubleAnimationUsingKeyFrames StoryboardTargetName="ellipse2" StoryboardTargetProperty="(CanvasLeft)" > <SplineDoubleKeyFrame KeyTime="0:0:5" Value="250" KeySpline="025,0 05,07"></SplineDoubleKeyFrame> <SplineDoubleKeyFrame KeyTime="0:0:10" Value="500" KeySpline="025,08 02,04"></SplineDoubleKeyFrame> </DoubleAnimationUsingKeyFrames> The fastest acceleration occurs shortly after the 5-second mark, when the second SplineDoubleKeyFrame kicks in Its first control point matches a relatively large y-axis value, which represents the animation progress (08) against a correspondingly smaller x-axis value, which represents the time As a result, the ellipse increases its speed over a small distance before slowing down again Figure 10-11 shows a graphical depiction of the two curves that control the movement of the ellipse To interpret these curves, remember that they chart the progress of the animation from top to bottom.





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String.Format("The car exploded at {0}", DateTime.Now)) ex.Data.Add("Cause", "You have a lead foot.") Throw ex Else Console.WriteLine("=> CurrSpeed = {0}", currSpeed) End If End If End Sub To successfully enumerate over the key/value pairs, you first must make sure to specify an Imports directive for the System.Collection namespace, given we will make use of a DictionaryEntry type in the file containing the module implementing your Main() method: Imports System.Collections Next, we need to update the catch logic to test that the value returned from the Data property is not Nothing (the default setting). After this point, we make use of the Key and Value properties of the DictionaryEntry type to print the custom user data to the console: Catch ex As Exception ... ' By default, the data field is empty, so check for Nothing. Console.WriteLine("-> Custom Data:") If (ex.Data IsNot Nothing) Then For Each de As DictionaryEntry In ex.Data Console.WriteLine("-> {0} : {1}", de.Key, de.Value) Next End If End Try With this, we would now find the update shown in Figure 7-4.

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ADO.NET provides a safe method for passing parameters to an SP or SQL statement, known as parameterization. The classic Visual Basic 6/VBScript method of concatenating parameter values directly into a long SQL query string is inefficient and potentially unsafe (see the SQL Injection and Performance sidebar later in this chapter for more information). A concatenated string query might look like this:

Looking at the first curve, you can see that it follows a fairly even progress downward, with a short pause at the beginning and a gradual leveling off at the end However, the second curve plummets downward quickly, achieving the bulk of its progress, and then levels off for the remainder of the animation..

Cool! At this point you hopefully have a better idea how to throw and catch exception objects to account for runtime errors. Next, let s examine the process of building strongly typed custom exception objects.

System-Level Exceptions (System.SystemException)

string sqlstatement = "SELECT " + " BusinessEntityID, " + " LastName, " + " FirstName, " + " MiddleName " + "FROM Person.Person " + "WHERE LastName = N'" + name + "';"; The value of the name variable can contain additional SQL statements, leaving SQL Server wide open to SQL injection attacks, as in the following: string name = "'; DELETE FROM Person.Person; --"; This value for the name variable results in the following dangerous SQL statements being executed on the server: SELECT BusinessEntityID, LastName, FirstName, MiddleName FROM Person.Person WHERE LastName = N''; DELETE FROM Person.Person; -- '; Parameterized queries avoid SQL injection by sending the parameter values to the server separately from the SQL statement. Listing 15-3 demonstrates a simple parameterized query. (The results are shown in Figure 15-2.) Listing 15-3. Parameterized SQL Query using System; using System.Data; using System.Data.SqlClient; namespace Apress.Examples { class Listing15_3 { static void Main(string[] args) { string name = "SMITH"; string sqlconnection = "SERVER=SQL2008; " + "INITIAL CATALOG=AdventureWorks; " + "INTEGRATED SECURITY=SSPI;"; string sqlcommand = "SELECT " + " BusinessEntityID, " + " FirstName, " + " MiddleName, " +

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