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A network link to a server might fail just as you're transferring data.

Or perhaps you simply didn't allow for a particular rare circumstance in your code. NET Framework offers a robust set of tools for dealing with these unexpected problems.

You might think that this code would compare a numeric value in Text1 and return Acceptable Value for values 1 through 12, and Unacceptable Value for all other numbers.

vb validating textbox-6

This function automatically converts a string into the appropriate type: integer, long, single, or double.

Visual Basic 6 has finally come up with a solution for most of the validation issues that have afflicted Visual Basic developers for years.

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.

In many situations you need to enter only numeric values in the Textbox.

Here you can see some useful techniques that accept only numbers in the textbox.

As you'll see in a moment, the Visual Basic 6 approach is simple and clean; it really astonishes me that it took six language versions to deliver such a lifesaver.

The keys to the new validation features are the Validate event and the Causes Validation property.

Run the sample program on the companion CD, type something in the required Text Box, and then move to the second field.

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