Input Validation for ASP.NET Core CASENET Practice Questions (Page 2)

Questions 6–10

1. 6expert · hard

   An ASP.NET Core MVC form has a `Username` field with a [Remote] attribute pointing to an action that checks availability. The team notices that the remote validation does not fire when the form is submitted. They have included jQuery and jQuery Validation scripts. What is the most likely cause?

   • AThe [Remote] attribute is applied to the wrong property.
   • BThe action method returns a 200 status code with a string "true".
   • CThe unobtrusive validation script is not included or the data attributes are not being parsed.
   • DThe form does not have a submit button.
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2. 7application · medium

   An ASP.NET Core MVC Razor view uses tag helpers to render a form. The team wants client-side validation to work without writing custom JavaScript. What must be configured in the view or layout to enable unobtrusive validation?

   • AInclude the jQuery and jQuery Validation scripts and call `$.validator.unobtrusive.parse()` on document ready.
   • BSet `ClientValidationEnabled` to true in the `_ViewImports.cshtml` file.
   • CAdd `asp-validation-for` tag helpers for each input and include the validation scripts in the layout.
   • DUse `Html.EnableClientValidation()` in the view.
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4. 8foundation · easy

   Which tag helper is used to display validation messages for a specific model property in a Razor view?

   • A<input asp-for="PropertyName" />
   • B<span asp-validation-for="PropertyName"></span>
   • C<div asp-validation-summary="All"></div>
   • D<label asp-for="PropertyName"></label>
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5. 9foundation · easy

   What does Validator.TryValidateObject return?

   • AAn exception if validation fails.
   • BA ValidationResult object.
   • CA boolean indicating whether validation succeeded.
   • DA list of validation errors.
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6. 10application · medium

   An ASP.NET Core MVC form has a `Password` field. The team wants to display a specific error message 'Password must be at least 8 characters' when the password is too short. They also want the message to appear next to the field in the view. What should they do?

   • AAdd a JavaScript function that checks the password length and displays an alert.
   • BSet the ErrorMessage property on the [StringLength] attribute and use the asp-validation-for tag helper in the view.
   • CUse a custom validation attribute that returns the message and manually add it to ModelState.
   • DUse the [Remote] attribute to return the custom message from an action.
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