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26-Jul-2017 09:04

Upon popular demand, I have added a section that also covers how to use a validator control to check if a text box contains a number. They can be configured to work client side to prevent unnecessary postbacks to the server and they set the Page.

However, as you may have noticed, the content of the two textboxes is not checked before comparing it.

Register Startup Script() method or Script Manager registration methods to register the file with the page.

Once you have your client side script included into your aspx page, you need to call the Java Script function that filters your text box.

You can protect against empty fields with the Required Field Validator, and you can protect against wrong values like text with for instance a Regular Expression Validator, which we will show you how to use a bit later.

If the clientside validation is not working, the invalid form will be catched by our piece of code in the Code Behind file, as shown with the Required Field Validator.

However, as you may have noticed, the content of the two textboxes is not checked before comparing it.

Register Startup Script() method or Script Manager registration methods to register the file with the page.

Once you have your client side script included into your aspx page, you need to call the Java Script function that filters your text box.

You can protect against empty fields with the Required Field Validator, and you can protect against wrong values like text with for instance a Regular Expression Validator, which we will show you how to use a bit later.

If the clientside validation is not working, the invalid form will be catched by our piece of code in the Code Behind file, as shown with the Required Field Validator.

For instance, it would be possible to enter nothing, or enter a piece of text instead of a number.