data annotation for form validation

Question

Hi Team I want to find some examples where user leaves textbox from the form. It will validates "The field is required cannot be empty", only using data annotation not javascript error handling. Please mates help i need this implementation for my application of web app in c# asp.net.

Harsh Shah · Answer

write [Require (ErrorMessage="The field is required cannot be empty")] above your field in model class. for example: [Require (ErrorMessage="The field is required it can not be empty")] public string Name {get; set; }

Jignesh Kumar · Answer

Hey please use this link, https://www.c-sharpcorner.com/UploadFile/47548d/data-annotations-validation-in-asp-net-4-5/

Guest User · Answer

Mates I have put this logic for that but im unable to get any error message before leaving the texbox. See my logic for thos required fields within a form. // Model class for data annotation for error validation within a form. public class EditTrainingRegFormViewModel { public string Title { get ; set ; } public string FirstName { get ; set ; } public string LastName { get ; set ; } public string Position { get ; set ; } public string Company { get ; set ; } public string Address { get ; set ; } [Display(Name = "Choose country" )] public int ? SelectedCountryId { get ; set ; } [Required] [RegularExpression(@ "^[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,}$" )] [Display(Name= "Postal/Zip Code" )] public string Code { get ; set ; } [DataType(DataType.Text)] [Required(ErrorMessage = "This field is required" )] public string City { get ; set ; } [Required(ErrorMessage = "This field is required" )] public string State { get ; set ; } [Required(ErrorMessage = "This field is required" )] public string Cell_Number { get ; set ; } public string Email { get ; set ; } public int Country_Id { get ; set ; } public string Country_Name { get ; set ; } }

Vertika Chauhan · Answer

Inside the model class of this field put [required] attribute on the top of the field Eg : [required] Public string name {get; set;}

data annotation for form validation

Answers (4)