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Name Property
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The Name property is important because its value is how the label is referred to in code By default, the first label you add to your form is named Label1, the second Label2, the third Label3, and so forth The default name is fine if you will not be referring to the label in your code This would be the case if the purpose of the label simply is to identify the purpose of another control However, using a default name can cause you difficulty if you are referring to the label in code, such as if the purpose of the label is to display information that may change when the application is running The difficulties you may encounter increase as the number of the labels in your application increase For example, you may have difficulty remembering if Label53 is the one that displays weather information or the one that displays your bank account balance I recommend you use a naming convention when naming your controls A naming convention simply is a consistent method of naming controls There are a number of naming conventions It is not particularly important which naming convention you use What is important is that you use one and stick to it One often-used naming convention is to name a control with a prefix, usually all lowercase and consisting of three letters, that indicates the type of control it is, followed by a word, first letter capitalized, that suggests its purpose For example, lblWeather would indicate a label that displays weather information If you need more than one word to describe the control s purpose, you should combine the words into one (because a name cannot have embedded spaces) but capitalize the first letter of each word For example, lblBankAccountBalance would indicate a label that displays your bank account balance
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Visual Basic 2005 Demysti ed
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T IP Be careful when you use prefixes such as lbl that you use a lowercase L and not the number 1 Interchanging the two can cause typos that are hard for you to see, and also will result in a compiler error because control names cannot start with a number
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The Label Control in Action
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In this section, you will create a project (or reuse an existing project) to display the X and Y coordinates of the mouse pointer while the mouse is moving over the form Figure 3-8 shows what the application looks like when it is running Of course, the X and Y coordinates displayed will vary depending on where the mouse is located over the form
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Mouse Coordinates
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A brief explanation of how mouse coordinates work may be helpful before explaining how the code works Similar to the concept of coordinates in graphing, mouse coordinates are expressed in two numbers The first is usually referred to as X and measures a horizontal distance from a reference point The second is usually referred to as Y and measures a vertical distance from a reference point In the context of a mouse moving over a form, the reference point is the top-left corner of the form Thus, the X coordinate measures the horizontal distance from the left side of the form, and the Y coordinate measures the vertical distance from the top of the form
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Figure 3-8 Application displaying mouse coordinates
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CHAPTER 3 Controls
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Coordinates by convention are expressed with the syntax X,Y Therefore, the top-left corner of the form would be the coordinate 0,0 If a coordinate is 60,77, the mouse is 60 units to the right of the left edge of the form, and 77 units below the top edge of the form The unit of measure is a pixel, a shortened term for picture element, which is a dot representing the smallest graphic unit of measurement on a screen Screen resolutions such as 1024 768 are expressed in pixels
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