Validating event of textbox in c

For this demo application, I have taken a very simple example. 1) Fix for the code block For the css 'pre', add new property 'min-width: 730px;' and add width nn percentage.

NET lets you build complex applications quickly and easily, but its selection of controls does have notable gaps.

Fortunately, you can address part of this deficiency yourself by building your own self-validating text input controls. NET's existing controls restrict the user input based on the type of input required.

The canonical example of this type of control is a Text Box control that lets the user enter only numbers.

But my problem is that the textbox just should not allow any non numeric characters without any Button Click event.

Basically the Text Box should check the characters as it is typed.

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This topic provides some details on the order of events during several important stages in the lifetime of applications and controls.

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