about good programming practice

amsainju asked:

I have a question related to good programming practice.

Suppose I need to input a name of my customer in a text box, but the character to be input should only be letters and spaces. The customer can enter numbers, !@, etc, they can make an error unknowingly "arpan1" can be saved into the database.

There are two ways to solve this problem, one is when a user press save button then a message box can be displayed or error defining label can be shown as seen in many website forms, but what if we don't allow user to input numbers and other invalid characters. If the user presses 1 then the 1 or any other invalid character does not appear in the text box by some event handling method.

I would like to know which one is better to do?

Thank you,
Arpan

Tags: C#, Java, Visual Studio (Visual Studio 2008)

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