example of working with custom attributes on properties in c#

using System.Reflection;

public sealed class MyAttribute : Attribute

    {

        private bool _MYbool = true;

        public bool MYbool

        {

            get { return __MYbool; }

            set { __MYbool= value; }

        }

        public MyAttribute()

        {

        }

        public MyAttribute(Boolean value)

        {

            _MYbool = value;

        }

    }

/// This Routine checks that the CalculationAttribute is Set or not

/// Put this function in a public static Class

/// 

/// the name of the object

/// the propertyname where to check on

/// 

public static Boolean PropertyCheckTo(this object SourceObj, string PropertyName)

 {

   PropertyInfo[] SourceProps = SourceObj.GetType().GetProperties();

   foreach (PropertyInfo pi in SourceProps)

   {

     if (pi.Name == PropertyName)

       {

       MyAttribute att = (MyAttribute )Attribute.GetCustomAttribute(pi, typeof(MyAttribute ));

         if (att != null)

         {

            return true;

         }

        }                

    }

    return false;

  }