websitepanel/WebsitePanel/Sources/WebsitePanel.WebDavPortal/CustomAttributes/FormValueRequiredAttribute.cs

using System.Reflection;
using System.Web.Mvc;

namespace WebsitePanel.WebDavPortal.CustomAttributes
{
    public class FormValueRequiredAttribute : ActionMethodSelectorAttribute
    {
        private readonly string _submitButtonName;

        public FormValueRequiredAttribute(string submitButtonName)
        {
            _submitButtonName = submitButtonName;
        }

        public override bool IsValidForRequest(ControllerContext controllerContext, MethodInfo methodInfo)
        {
            var value = controllerContext.HttpContext.Request.Form[_submitButtonName];
            return !string.IsNullOrEmpty(value);
        }
    }
}