So, if you disdain and said: not that the design of a component? This is what is difficult! So, hey I will smile, because I know you must be kidding. However, do not be afraid, "Oh, programmers need to explore the spirit!" If we design a WEB visual control, and constitute a part of WEB pages, you can inherit the Control class or WebControl class. If it is a non-visual control, can inherit Component, inherited the design of such controls will not appear on the page, but appears in the Component Tray. Remember OpenFileDialog controls? File Open dialog box that appears in the Component Tray control is in the control. If we are only on the basis of the existing control enhancements, you inherit the existing control it. Suppose we want to design a component that only allows the user to enter numbers, the validation should naturally be placed in the client, client-side validation scripts can be written like this: META Content = "Microsoft Visual Studio 6.0" script language = "javascript"
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