c# - Missing form validation in MVC application -

i have form containing check boxes, , know can make each 1 required enforce validation errors. looking for, error if none of boxes has been checked. how go achieving this?

i looking error message like: "you must select @ least 1 property."

i should clarify none of fields required individually, there should @ least 1 chosen option.

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edit clarification:

my view looks this:

@using (html.beginform("method", "controller", formmethod.post, new {id = "id"})) {     @html.antiforgerytoken()     @html.validationsummary(true, "", new { @class = "text-danger" })     <div class="form-group">        @html.labelfor(model => model.property1, htmlattributes: new { @class = "control-label col-md-4" })        <div class="col-md-8">           @html.checkboxfor(model => model.property1)        </div>     </div>     <div class="form-group">        @html.labelfor(model => model.property2, htmlattributes: new { @class = "control-label col-md-4" })         <div class="col-md-8">             @html.checkboxfor(model => model.property2)         </div>      </div>      <div class="form-group">         @html.labelfor(model => model.property3, htmlattributes: new { @class = "control-label col-md-4" })         <div class="col-md-8">            @html.checkboxfor(model => model.property3)         </div>      </div> } 

my view model looks this:

public class formvm  {    [display(name = "one")]    public bool property1 {get;set;}    [display(name = "two")]    public bool property2 {get;set;}    [display(name = "three")]    public bool property3 {get;set;} } 

you can implement ivalidatableobject interface on viewmodel:

public class formvm : ivalidatableobject {     [display(name = "one")]     public bool property1 {get;set;}      [display(name = "two")]     public bool property2 {get;set;}      [display(name = "three")]     public bool property3 {get;set;}      public ienumerable<validationresult> validate(validationcontext validationcontext)     {         var results = new list<validationresult>();          if (!(property1 || property2 || property3))         {             results.add(new validationresult("you must select @ least 1 property."));         }          return results;     } } 

the benefit of using this fired automatically if call modelstate.isvalid in controller, , error message added modelstate errors.