What is the meaninf of following code?

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Can anybody explain me the following code??

C#

[Required(ErrorMessage = "The email field is required.")]
[StringLength(100, ErrorMessage = "The {0} must be at least {2} characters long.")]
//[DataType(DataType.EmailAddress)]
[RegularExpression(@"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$", ErrorMessage = "Please enter a valid email")]
[Display(Name = "Email")]
public string ContactEmail { get; set; }

Posted 14-Dec-14 19:18pm

Member 11242836

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DamithSL 15-Dec-14 1:34am

why not read the documentation? refer some tutorials documentations first, then ask specific question.
check these...[^]

Member 11242836 15-Dec-14 2:23am

thnks... it just went above my head n i didnt even knew what to search..

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Raul Iloc · Accepted Answer · 2014-12-14T20:15:00

These are 4 attribuits applied to the given property, and normally they are used in the context of validation, and here are the meaning:
1. Required - mark the property as required, and if the user forgot to enter a value for this property the associated message will be shown.
2. StringLength - set the max length of the string to 100, but the error message is not set correctly in this case. See details here: http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.stringlengthattribute(v=vs.110).aspx[^]
3. RegularExpression set the regular expression that will be used to validate the user input.
4. Display - set the default display name for this property. This will be used in ASP.NET MVC in the generated Views as the name of the label for this property.