Validating user input in vb net

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They can be useful during information validation, to ensure that data is in a specified format.

If the program code does not match the Regular Expression then the compiler indicates that there is a syntax error. When a user clicks the OK button, the program checks to ensure that none of the fields are empty.For example, interest rates fall within permitted boundaries.Introduction This article is about a Windows application and presents a more involved example that uses Regular Expressions to validate name, address and telephone number information input by a user.First, add the following code to the Form’s constructor after the Initialize Component method: This is a handy trick to prevent implicit validation of our controls when they lose focus.You do not have to disable the Form’s Auto Validate property.

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