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A one-dimensional array is a list of related variables Such lists are common in programming For example, you might use a one-dimensional array to store the account numbers of the active users on a network Another array might store the current batting averages for a baseball team Because arrays in C# are implemented as objects, two steps are needed to obtain an array for use in your program First, you must declare a variable that can refer to an array Second, you must create an instance of the array by use of new Therefore, to declare a onedimensional array, you will typically use this general form: type[ ] array-name = new type[size];

00500 09988 19004 6831 27436 28534 00996 09950 37852 6806 46258 48110

CREATE THE PASSWORD SECTION OF THE ALBUMEDITDLG FORM Action 1 In the AlbumEditDlg.cs [Design] window, drag a CheckBox control from the Toolbox window onto the form.

Part I:

Add a text box to receive the password, and an additional label and text box to confirm the password. Set the size and position of these controls as shown in the graphic.

Here, type declares the element type of the array The element type determines the data type of each element that comprises the array Notice the square brackets that follow type They indicate that a one-dimensional array is being declared The number of elements that the array will hold is determined by size

declared Specifically, the square brackets follow the type name, not the array name Here is an example The following creates an int array of ten elements and links it to an array reference variable named sample

Enabled PasswordChar Label (Name) Enabled Text TextAlign Second TextBox (Name) Enabled PasswordChar

int[] sample = new int[10];

False * lblConfirmPwd False Confir&m Password MiddleLeft txtConfirmPwd False x Note: Since the default value for the

The sample variable holds a reference to the memory allocated by new This memory is large enough to hold ten elements of type int As is the case when creating an instance of a class, it is possible to break the preceding declaration in two For example:

int[] sample; sample = new int[10];

set to disabled by default. We will enable them when the user clicks the check box. Also, notice the two different settings for PasswordChar used here. This is done only for illustrative purposes. Generally, you should use the same password character for all controls in a window.

In this case, when sample is first created, it refers to no physical object It is only after the second statement executes that sample refers to an array An individual element within an array is accessed by use of an index An index describes the position of an element within an array In C#, all arrays have 0 as the index of their first element Because sample has 10 elements, it has index values of 0 through 9 To index an array, specify the number of the element you want, surrounded by square brackets Thus, the first element in sample is sample[0], and the last element is sample[9] For example, the following program loads sample with the numbers 0 through 9:

CREATE THE PASSWORD SECTION OF THE ALBUMEDITDLG FORM (continued) Action 3 Use the tab order view to assign the

// Demonstrate a one-dimensional array using System; class ArrayDemo { static void Main() { int[] sample = new int[10]; int i; for(i = 0; i < 10; i = i+1) sample[i] = i; for(i = 0; i < 10; i = i+1) ConsoleWriteLine("sample[" + i + "]: " + sample[i]); } }

The output from the program is shown here:

Add a CheckedChanged handler for the CheckBox object to enable the controls when the box is checked.

sample[0]: 0 sample[1]: 1 sample[2]: 2

00500 09988 19004 6831 28943 30101 00996 09950 37852 6806 47765 49677

private void cbtnPassword_CheckedChanged (object sender, System.EventArgs e) { // Enable pwd controls as required. bool enable = cbtnPassword.Checked; txtAlbumPwd.Enabled = enable; lblConfirmPwd.Enabled = enable; txtConfirmPwd.Enabled = enable; if (enable) { // Assign focus to pwd text box txtAlbumPwd.Focus(); } } private void txtAlbumPwd_Validating (object sender, System. ComponentModel.CancelEventArgs e) { if (txtAlbumPwd.TextLength == 0) { MessageBox.Show(this, "The password for the album " + "cannot be blank", "Invalid Password", MessageBoxButtons.OK, MessageBoxIcon.Error); e.Cancel = true; } }

7:

sample[3]: sample[4]: sample[5]: sample[6]: sample[7]: sample[8]: sample[9]:

Add a Validating event handler to the txtAlbumPwd control. Note: The Validating and Validated events allow custom validation to be performed on a control.

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