Validating input in vb net

The Required Field Validator linked to it has an ID attribute called rfv Name and I've included some of the most commonly used attributes.

I used the Control To Validate attribute to link Required Field Validator to the textbox.

Validating the information entered by users is an essential part of developing a professional Web-based user interface. NET validation controls use a combination of the benefits of traditional data validation. NET data validation controls process data validation on the Web server, but you can also optionally process data validation on the user's computer. Hence, if you configure the data validation controls to enable validation on the user's computer, the resulting HTML is browser-specific.

More precisely, the rendered HTML uses a script library called Web and implements Microsoft JScript functionality that is only supported by Microsoft Internet Explorer 4.0 and later versions.

The Run At="Server" attribute is required for all ASP. The Display attribute determines how space is reserved to display the validation control message if data validation fails. NET will allocate the space on the page when the page is rendered. Other possible values for the Display attribute are Dynamic and None. NET validation controls uses a script library called Web and implements Microsoft JScript functionality that is only supported by Microsoft Internet Explorer 4.0 and later versions.

However, when you validate a process on the Web server, you can use any scripting language because the user's Web browser doesn't process the scripting language.

In addition, malicious users can subvert the validation process.

Users with harmful intent may easily modify the validation script because it is contained in the source of the page that is sent to the user's computer.

The data validation controls are shown in Figure 1 as they appear in the Visual Studio . To use it, you link the Required Field Validator control to another control, such as a textbox, and use it to determine if the linked control has a value entered into it or it is empty.

If the linked control has a value entered into it, data validation will succeed.

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Alternatively, if the linked control is empty, data validation will fail.

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