By Steven A. Smith
Written for net builders accustomed to energetic server pages (ASP), this booklet bargains directions for migrating to ASP.NET in addition to introductions to the controls to be had, information entry with ADO.NET, and internet providers. Separate chapters clarify the best way to paintings with internet, checklist, wealthy, validation, and consumer controls, and supply code examples written in both C# or visible uncomplicated.
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Additional resources for Asp. Net: By Example
In this case, our control name is TextBox, and our complete Web Control tag would look like this:
On our HTML page, then, we display the error message as bold text, which remains unseen if no errors were encountered. NET Validation Controls"). aspx, which uses three validation controls, the RequiredFieldValidator, RangeValidator, and ValidationSummary controls. aspx. Text & ". com/aspnetbyexample/). The real differences are in the HTML code, with the addition of a few more controls. The first control we encounter as we move down the page is the ValidationSummary control. This control is used to display summarized results of validation, and mirrors the way in which our ASP page's server-side validation was displayed:
" End If 'Only show output if no errors If strError = "" Then strOutput = "Hello, " & first_name & ". " End If End If As you can see, we check first_name, age, and sex to see if they are blank (""), and build an error string if they are. We also verify that age is numeric and positive, again setting appropriate error messages if we find its value to be invalid. Finally, we only output our message if there were no errors. In a more complex example, we might use this technique to limit database updates to valid values.