Attributes are one of the ways to associate complementary information with existing data. Sample projects in the section above contain much more comprehensive set of use cases.Such annotations may also define the correctness of data. Above we are saying, that annotated field is required when condition given in the logical expression is satisfied (passport number is required, if go abroad field has true boolean value). NET and Java Script library which provides annotation-based conditional validation mechanisms.
Find the below sample screen shot for validating the fields before saving the data Img 3: Validation method Here I have validated the fields using the Boolean method, If all the field values are entered properly it will return true, other wise it will return false and will display an error message.
The source code shows how to use Regular Expressions in C#.
All basic PHP functions which i tried returned unexpected results.
I would just like to check whether some variable only contains numbers.
in case extra validation like restricting validation to some of the controls only, that would be decided at the function calling level.
In my windows form projects , i have validated the fields using Boolean method.
Some people strongly believe that regular functions slow down your script. is_numeric() accepts values like: 0123.45e6 (but you would expect it would not)2.
is_int() does not accept HTML form fields (like: 123) because they are treated as strings (like: "123").3.
The Framework Class Library (FCL) includes a large set of exception classes for dealing with various unforeseen conditions in the normal execution environment. NET Framework provides two exception classes that derive from the common Exception class: Both of these child exception classes enjoy the same properties and are differentiated only in the source of the exception they represent.
Table 3.1 details some of the important properties of the Exception class, inherited by the exception classes.
Since fields validation requirements are applied as metadata, domain-related code is more condensed.