Field validations
ASP.NET Core

You can easily enable validation for the field values by using the attributes provided.
Sitefinity CMS supports the following attributes:

EmailAddress
Validates an email address.
MaxLength
Specifies the maximum length of array or string data that is allowed.
MinLength
Specifies the minimum length of array or string data that is allowed.
Range
Specifies the numeric range limits for the value of a data field.
RegularExpression
Specifies that a data field value in ASP.NET Dynamic Data must match the specified regular expression.
Required
Specifies that a data field value is required.
StringLength
Specifies the minimum and maximum length of characters that are allowed in a data field.
Url
Provides URL validation.

To apply validation attributes, use the following code sample:

using System.ComponentModel.DataAnnotations;

namespace SitefinityWebApp
{
   public class DemoValidations
   {
       [Url(ErrorMessage = "Enter valid URL.")]
       public string UrlField { get; set; }

       [EmailAddress(ErrorMessage = "Enter valid email.")]
       public string EmailField { get; set; }

       [Range(1, 20, ErrorMessage = "Стойност между {1} и {2}.")]
       public double DoubleValidation { get; set; }
      
       [StringLength(6, ErrorMessage = "Value should be between {1} and {2} symbols.", MinimumLength = 2)]
       public string StringLengthValidation { get; set; }

       [MinLength(2, ErrorMessage = "The message length must be at least {1} symbols.")]
       [MaxLength(10, ErrorMessage = "The message must be less than {1} symbols.")]
       public string StringValidation { get; set; }

       [Required(ErrorMessage = "This is required string {link}.")]
       public string StringFieldRequired { get; set; }
   }
}

These validation attributes are provided in Microsoft's ASP.NET System.ComponentModel.DataAnnotations Namespace.

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Field validations ASP.NET Core

Field validations
ASP.NET Core