.net - Add Custom Validation Errors in Silverlight -

is there way add custom validation errors list of control's errors? know how use idataerrorinfo, inotifyerrorinfo, validationattribute, etc, add custom validation errors code.

found way:

1. first, create public class holding our error message:

   public class tagmodelerror { private readonly string errormessage;

       public tagmodelerror(string errormessage)     {         this.errormessage = errormessage;     }      public object tag     {                 {             return new object();         }         set         {             throw new validationexception(this.errormessage);         }     } } 

2. next, create helper method:

   public static void addvalidationerror(this control control, string errormessage) { var expression = elm.getbindingexpression(frameworkelement.tagproperty);

       if (expression == null)     {         expression = control.setbinding(frameworkelement.tagproperty, new binding("tag")         {                            mode = bindingmode.twoway,             validatesonexceptions = true,             updatesourcetrigger = updatesourcetrigger.explicit,             source = new tagmodelerror(errormessage)         }) bindingexpression;     }      expression.updatesource(); } 

i using tag property because seldom required, can use one. trick here cause exception when writing model.