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I realise this question has been asked before but I am still struggling with validating this checkbox using data annotations. What am I missing. As it is right now the checkbox is not validated

view model

[AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = false)]
    public class MustBeTrueAttribute : ValidationAttribute
    {
        public override bool IsValid(object value)
        {
            return value != null && value is bool && (bool)value;
        }

    }
    [Display(Name = "I accept the terms and conditions")]
    [Required]
    [MustBeTrue(ErrorMessage = "Please accept terms and conditions")]
    public bool TermsConditions { get; set; }

Razor and html

<div class="editor-label">
    @Html.LabelFor(model => model.TermsConditions)
 </div>
 <div class="editor-field">
     @Html.CheckBoxFor(model => model.TermsConditions, new { id = "chkTermsAndConditions" })
        Yes

  </div>
  @Html.ValidationMessageFor(model => model.TermsConditions)
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1 Answer

up vote 0 down vote

This is working fine but is only server side validation. In your Action method, do this:

public ActionResult Terms(Terms terms)
{
    if(!ModelState.IsValid)
    {
        //If checkbox isn't ticked, your code will end up in here
    }
}
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