How to trim all value in MVC (while add and edit)

public class TrimModelBinder : System.Web.Mvc.DefaultModelBinder
   {
       protected override void SetProperty(ControllerContext controllerContext, System.Web.Mvc.ModelBindingContext bindingContext,System.ComponentModel.PropertyDescriptor propertyDescriptor, object value)
       {
           if (propertyDescriptor.PropertyType == typeof(string))
           {
               var stringValue = (string)value;
               if (!string.IsNullOrWhiteSpace(stringValue))
               {
                   value = stringValue.Trim();
               }
               else
               {
                   value = null;
               }
           }
           base.SetProperty(controllerContext, bindingContext,
                               propertyDescriptor, value);
       }
   }

//global.asax Application_Start event.

ModelBinders.Binders.DefaultBinder = new TrimModelBinder();