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Validating data in vb net

No sir I didn't replace the decimal point by a comma.

there is a different between comma(,) and dot(.) in checking a "Double" data type.

In this chapter, we'll look at two facets of dealing with problems in . First, we'll demonstrate the programming that you can do to handle errors, allowing the user to make corrections when something goes wrong.

Then, we'll demonstrate how you can use validation techniques to prevent bad data from being entered into your application in the first place.

Example 3 shows how to do so through the static Validate Property method of the Validator class.

Consistent use of these techniques will help make your applications more robust and reliable.

When an application encounters an unexpected situation (such as a missing file or input parameter) or a logical error (performing a division-by-zero operation, for example), by default the application will terminate and generate an error display like the one shown in Figure 3.1. NET displays an error message and terminates the application when any error occurs.

For example: Data type validation is customarily carried out on one or more simple data fields.

The simplest kind of data type validation verifies that the individual characters provided through user input are consistent with the expected characters of one or more known primitive data types; as defined in a programming language or data storage and retrieval mechanism.

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Dim str_Decimal As String ' Same as above Dim str_Percent(_Count) As String ' maybe the length is all decimal numbers?

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