If a user enters a non-numeric value into a TextBox and presses a Button, I want to show an error message on a Label.
How can I achieve this?
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If a user enters a non-numeric value into a TextBox and presses a Button, I want to show an error message on a Label.
How can I achieve this?
Are you saying you want to allow numbers only?
If this will allow numbers only, but will also allow you to skip the box entirely. If you want to make it required, add this:
Update: If you would like to accept decimal values like “3.5” in addition to just “3”, modify the ValidationExpression in the RegularExpressionValidator I supplied above to read “^\d+(\.\d+)?$”