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| There five main types of code in Visual Basic - Procedure Calls: You can call a procedure that you created, or you can call another control's event. Procedures include functions (return a value) and subs (don't return a value). - Compiler Functions: If you know another form of BASIC then you are undoubtedly familar with it's simple functions like Chr$(), Asc(), and Ucase$(). These functions are like user-defined functions and always accept arguments and return values. - Keywords: Like compiler functions, all versions of BASIC have built in keywords, or reserved words, like For, Next, Do, Loop, Select Case, Error, Goto, and Gosub. These appear in dark blue by default in the Visual Basic IDE. - Control Properties: You can set control properties that can be set at run time from within the code. For example, you could set the text property of a text box by typing txtInput.Text = "This is in the textbox", assuming that the na me of the textbox is txtInput. Notice the period. All properties are set after the control name with a seperating period. There are three times you will use periods after a word in Visual Basic: as a property, as a method, and as the member of a user-d efined type. - Methods: Many objects in Visual Basic contain unique functions that can be performed on them. A function unique to an object is called a method. The method function is called after the name of the object and is set in dark blue by default in th e Visual Basic IDE. An example of a method might look like imgPicturebox.Zorder, which will set the image control to the front of the screen, assuming that the image control's name is imgPicturebox. The Keyboard is one off the |
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