Analysis on five common controls for ASP. NET data verification

Necessity of ASP. NET data verification: Why data verification is required

Data insertion and update involve user operations. It is inevitable that some users do not know your system, or the user has incorrect hands and incorrect input format. For example, the price should have been a Number "0", and the user accidentally entered the character "o", it will cause an error. Therefore, it is necessary to use technical means to minimize possible errors, which requires data verification.

How to verify ASP. NET data

The most common method is to use JavaScript scripts. When a user clicks the "Log on" button, the script is executed to verify the content entered by the user. This can effectively improve the user experience.

However, JavaScript verification has some disadvantages:

1. JavaScript scripts are not secure enough, and malicious attackers can bypass verification.

2. JavaScript script writing is complicated, and there is no good debugging tool.

Convenient and safe way

ASP. NET provides five data verification controls. Next we will introduce them one by one:

ASP. NET data verification control 1. RequiredFieldValidator

The RequiredFieldValidator control ensures that you provide valid input, that is, non-empty verification. This control is the simplest and most commonly used verification control. It is often used together with other verification controls to verify its validity.

ASP. NET data verification control 2. CompareValidator

The CompareValidator control is used to verify whether the content entered by the user meets the requirements.

ASP. NET data verification control 3. RangeValidator

The RangeValidator control is used for range check. For example, the age group must be between 18 and 22 years old.

ASP. NET data verification control 4. RegularExpressionValidator

RegularExpression is the meaning of a regular expression. A regular expression is a special formula used to match a type of string in a certain pattern.

ASP. NET data verification control 5. CustomValidator

Sometimes the verification is special, so we need to write the verification code ourselves. The CustomValidator control is used for custom verification. The CustomValidator control supports client script verification and server verification.

The content of the ASP. NET data verification control is introduced here. I hope it will help you understand the ASP. NET data verification control.

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