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You probably expect that the second statement displays the value zero, but this state ment actually throws a NullReferenceException because the string object hasn t been initialized. A simple way to avoid this problem is to make a habit of initializing all String variables explicitly, as in this code:

There s another mistake here. The less-than character (<) is in the correct place, but rather than increasing the value of layer each time around, the change makes layer smaller by using the -- operator each time. This means that the value of layer never becomes greater than 4, so the loop never ends. The result is that your program appears to get stuck at this point.

You can tap the power of the String class by invoking one of its many methods. I listed its main methods in Table 7-1, with a brief description and the corresponding Visual Basic 6 function that returns the same result. I don t provide a code example for every method, but you can easily see that Visual Basic .NET strings are richer in functionality and let you adopt a more object-oriented, concise syntax in your applications. For example, see how much simpler and more readable the operation of inserting a substring has become:

Dim s As String = ABCDEFGHIJ"

Newsletters are generally text-based but frequently contain other types of information. Publisher provides ve standard newsletter page layouts: Story, Calendar, Order Form, Response Form, and Sign-Up Form. You can also insert a speci ed number of blank pages before or after the current page, or you can duplicate an existing page layout a speci ed number of times. (This option is particularly handy if you create your own page layouts.) In this exercise, you will create a newsletter with a color scheme appropriate for photocopying. You will replace placeholder text, copy t the text to the text boxes in which it appears, and add pages to accommodate the intended newsletter content. There is no practice le for this exercise.

s = Left(s, 3) & 1234 & Mid(s, 4)

Here s another example of the compactness that you can get by using the String methods. Let s say you want to trim all the space and tab characters from the beginning of a string.

Now you need to add the statements to the Update method that count the number of times that the B button has been pressed:

7:

You just have to load all the characters to be trimmed in an array of Chars and pass the array to the TrimStart function (and you can use the same pattern with the TrimEnd and Trim functions):

Dim cArr() As Char = { c, ControlChars.Tab } s = s.TrimStart(cArr)

5

You can even create the Char array on the fly:

if (pad1.Buttons.B == ButtonState.Pressed) { count++; }

s = s.TrimStart(New Char() { c, ControlChars.Tab})

In many cases, the new methods can deliver better performance because you can state more precisely what you re after. For example, you can determine whether a string begins or ends with a given sequence of characters by a variety of means under Visual Basic 6, but none of the available techniques is especially efficient. Visual Basic .NET strings solve this problem elegantly with the StartsWith or EndsWith method:

Check whether the strings starts with abc and ends with xyz . If s.StartsWith( abc ) And s.EndsWith( xyz ) Then ok = True

1. In the Publication Types list, click Newsletters. 2. Scroll the list in the center pane to see the available newsletter templates. Then in

The next example shows how to pad a string to the right with zeros so that the result ing length is 10 characters, by means of the PadRight method:

s = s.PadRight(10, 0"c)

This seems to be what you want; if the condition is true because the button has been pressed, the counter is incremented. Sample Code: Broken Button Bash A the samp e projects can be obta ned from the Web

Although most of the time you can use the newer methods to replace the old-style functions, you should pay attention to the subtle differences that can break your code: