Remove required field value from devextreme form

Question

I work with asp.net mvc and devextreme I have model with bool value and I will add form in the view

my problem is when I uncheck the checkbox I got a validation message the checkForImges field is required

I want to remove it and the red border

view code

@model ArchiveConfigManager.Models.QueryRetrieve
@using DevExtreme.AspNet.Mvc
@(Html.DevExtreme().Form().ID("form")
.ShowValidationSummary(false).ShowRequiredMark(false).
ShowOptionalMark(false).
ShowColonAfterLabel(false)
.ColCount(1)
.Items(items =>
{
    items.AddGroup()
    .Items(groupItems =>
    {      
      groupItems.AddSimple().DataField("CheckForImages").
      IsRequired(false).Label(l => l.Visible(false)).
      Editor(e => e.CheckBox().Text("Check For Images"))
      ;})
   ;})
      .FormData(Model)
      )

model code

 public class QueryRetrieve
    {
        public bool CheckForImages { set; get; }
}

the result is

Answer 1

The ASP.NET framework considers any non-nullable properties as required. So, to avoid the issue you can mark your CheckForImages property as nullable:

public class QueryRetrieve
    {
        public bool? CheckForImages { set; get; }
     }