Nick Symmonds, Nicholas Symmonds's Data Entry and Validation with C# and VB. NET Windows Forms PDF
By Nick Symmonds, Nicholas Symmonds
The outdated hacker adage ''Garbage in, rubbish out'' hasn't ever been so very important because it is at the present time. With ever-increasing quantities of knowledge flowing into and out of contemporary purposes, the duty of an program developer to regulate and make certain info is severely vital to any software program undertaking.
For the 1st time, facts access and Validation with C# and VB .NET home windows varieties brings jointly present wisdom in this topic in an comprehensible, easy-to-read shape. protecting improvement and most sensible practices for information access and validation, together with GDI+, customized controls, localization, accessibility, right info validation ideas, and top practices with visible easy and C#, facts access and Validation with C# and VB .NET home windows types is a booklet no sleek programmer may be with out.
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Extra info for Data Entry and Validation with C# and VB. NET Windows Forms
Does it make sense to use a menu or toolbar? What are the ease-of-use issues? What are the usability issues? These last two points are very important indeed. How easy the program is to use plays to the casual and unsophisticated user. How usable the program is plays to the power user and people who are very computer literate. Although it may seem as if these two points are diametrically opposed, they are not. In fact, the best programs have all aspects of both. Here is a list of items that enhance ease of use: Menus Toolbars Simple layout Context-sensitive help Preselected fields based upon already selected entries Visual cues such as icons and pictures Explicit error messages and verbose directions Autocompletion of data The power user looks for features such as the following: Easy tabbing between fields Hot keys Speed keys Consistency between screens Context menus Macro capability Of course, the power user looks for all the items in the preceding list as additions to the basic ease-of-use items.
Well, this is the main reason. Notice that the VB delegate for the Quit button uses the Handles keyword after the argument list. I cannot programmatically unhandle this delegate. However, the delegates that I assigned using the AddHandler method can be unhandled. And I do just that in this program with the delegate that selects text. What is really neat about removing the connection between the event and the delegate is that there is no code in the delegate that tests to see if I need to select the text according to the CheckBox value.
It is interesting to note what the TextBox does for you during navigation. Open up a new C# project and put several TextBoxes on the screen. Run the program and tab through each control. You will notice that the text in each control is selected automatically. Now click your mouse in one of the controls. The text in this control should not be selected anymore. Start tabbing again and all the controls will have their text selected except for the control you visited with the mouse before. NET TextBox control.
Data Entry and Validation with C# and VB. NET Windows Forms by Nick Symmonds, Nicholas Symmonds