Validating asp net server controls

I hope you liked the article and I thank you for viewing it. NET have been around for a very long time, but their constant growth means there’s always more to learn. Use these concepts to deepen your existing knowledge of C# and . Click here to Explore the Table of Contents or Download Sample Chapters!We at Dot Net Curry are very excited to announce the The Absolutely Awesome Book on C# and . This is a 500 pages concise technical e Book available in PDF, e Pub (i Pad), and Mobi (Kindle). NET, to have a solid grasp of the latest in C# and . It is as simple as registering the assembly and start using it.Step 5: As already discussed, we will be deriving from the Base Validator abstract class.Note: If you are wondering why we have chosen to create a custom validation control instead of using a Custom Validator, then I would state that the main reason for doing so is ‘reusability’.You would soon see that we will be using the same custom validation control to validate both the Check Box List as well as Radio Button List.Step 3: Our next step would be to create the custom validation control.

There are 6 Validation Controls included in the ASP. NET 3.5 framework, however with a few shortcomings.Let us see how we can now perform validation directly on the client side, without a postback. As you observe, we override the On Pre Render method and use the Register Expando Attribute to assign the function name ‘Check If List Checked’ an attribute called ‘evaluationfunction’. This is done to make sure that if the users have turned off javascript on their browsers, then this call passes the control back to the page and allows the rendering to continue by calling base. If Java Script is enabled on your browsers, the validation errors are displayed before the form is posted back to the server.To perform client side validation, you would need to override On Pre Render and create the javascript function using a String Builder object and output it using Page. The javascript function(Check If List Checked) takes one parameter, the validator object and returns ‘true’ if Valid (item in both Radiobuttonlist or Check Box List is checked) and ‘false’ if Invalid (Item in either Radiobuttonlist or Check Box List is not selected). The entire source code of the application can be downloaded from here.To enable client-side validation of the newly loaded forms you need to force the parsing of these forms (or a whole document) on the client side.Call the $.validator.unobtrusive.parse(selector) method to force parsing.

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