create barcode generator c# Working with Toolbox Controls in Visual C#.NET

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3 Working with Toolbox Controls
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Program lines can be more than 65,000 characters long in the Visual Studio Code Editor, but it is usually easiest to work with lines of 80 or fewer characters. You can divide long program statements among multiple lines by using a space and a line continuation character (_) at the end of each line in the statement, except the last line. (You cannot use a line continuation character to break a string that is in quotation marks, however.) I use the line continuation character in this exercise to break the second line of code into two parts.
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After you enter the code for the Button1_Click event procedure, the Code Editor should look similar to the following illustration.
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The complete Birthday program is located in the c:\vbnetsbs\ chap03\birthday folder.
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Save All button
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Click the Save All button to save your changes to disk.
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Now you re ready to run the Birthday program.
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Run the Birthday program
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Start button
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Click the Start button on the Standard toolbar. The Birthday program starts to run in the development environment. The current date is displayed in the date time picker.
Click the drop-down arrow in the date time picker to display the object in calendar view. Your form will look like the illustration on the following page. (You ll see a different date.)
Microsoft Visual Basic .NET Step by Step
Click the left scroll arrow to look at previous months on the calendar. Notice that the text box portion of the object also changes as you scroll the date. The today value at the bottom of the calendar doesn t change, however. Although you could scroll all the way back to your exact birthday, you may not have the patience to scroll month by month. To move to your birth year faster, select the year value in the date time picker text box and enter a new date.
Select the four-digit year in the date time picker text box. When you select the date, the date time picker will close. Type your birth year in place of the year that is currently selected, and then click the drop-down arrow again. The calendar reappears in the year of your birth. Click the scroll arrows again to locate the month in which you were born, and then click the exact day on which you were born. If you didn t know the day of the week you were born on, now you can find out! When you select the final date, the date time picker closes, and your birth date is displayed in the text box. Now click the button object to see how this information is made available to other objects on your form.
Click the Show My Birthday button. Visual Basic executes your program code and displays a message box containing the day and date of your birth. Notice how the two dates match:
3 Working with Toolbox Controls
Click OK in the message box. A second message box appears indicating which day of the year you were born on.
Click OK to display the final message box. The current date and time are displayed the program works! You ll find the date time picker object to be quite capable not only does it remember the new date or time information that you enter, but it keeps track of the current date and time as well, and it can display this date and time information in a variety of useful formats.
To configure the date time picker object to display times instead of dates, set the object s Format property to Time.
Click OK to close the message box, and then click the Close button on the form. You re finished using the DateTimePicker control for now.
Working with Controls
Microsoft Visual Basic .NET Step by Step
A Word About Terminology
So far in this book I ve used several different terms to describe items in a Visual Basic program. Although I haven t defined each of them formally, it s worth listing several of them now to clear up any confusion. Can you tell the difference yet Program statement A program statement is a keyword in the code that does the work of the program. Visual Basic program statements create storage space for data, open files, perform calculations, and do several other important tasks. Most keywords are shown in blue type in the Code Editor. Variable A variable is a special container used to hold data temporarily in a program. The programmer creates variables using the Dim statement to store the results of a calculation, create filenames, process input, and so on. Numbers, names, and property values can be stored in variables. Control A control is a tool you use to create objects on a Visual Basic form. You select controls from the Toolbox and use them to draw objects on a form with the mouse. You use most controls to create user interface elements, such as buttons, picture boxes, and list boxes. Object An object is the name of a user interface element you create on a Visual Basic form with a Toolbox control. You can move, resize, and customize objects by using property settings. Objects have what is known as inherent functionality they know how to operate and can respond to certain situations on their own. (A list box knows how to scroll, for example.) And objects are the members of classes, which serve as the blueprints for defining what an object does. You can program Visual Basic objects by using customized event procedures for different situations in a program. In Visual Basic, the form itself is also an object. Property A property is a value, or characteristic, held by an object. For example, a button object has a Text property to specify the text that appears on the button and an Image property to specify the path to an image file that should appear on the button face. In Visual Basic, properties can be
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