/// <summary>
        /// Modify only the specified properties of the MaterialGroup
        /// specified by:
        /// </summary>
        /// <param name="id">PK</param>
        /// <param name="propValues">Properties to change</param>
        public virtual void Modify(Int32 id, params KeyValuePair <string, object>[] propValues)
        {
            try
            {
                Trace.WriteInformation("({0}, {1})", Trace.GetMethodName(), CLASSNAME, id, string.Join(",", propValues));

                DataAccess.MaterialGroups materialGroups = new DataAccess.MaterialGroups();
                materialGroups.Modify(
                    id,
                    propValues);
                return;
            }
            catch (Exception ex)
            {
                Trace.WriteError("({0})", Trace.GetMethodName(), CLASSNAME, ex, id);
                throw;
            }
        }
        /// <summary>
        /// Modify the given MaterialGroup in the database
        /// </summary>
        public virtual void Modify(Model.MaterialGroup modifiedMaterialGroup)
        {
            try
            {
                Trace.WriteInformation("({0})", Trace.GetMethodName(), CLASSNAME, modifiedMaterialGroup);

                //Begin Checks
                CheckConstraints(modifiedMaterialGroup);

                if (!Exists(modifiedMaterialGroup))
                {
                    throw new BusinessException(string.Format("There is no MaterialGroup with this id. ({0})", modifiedMaterialGroup));
                }

                DataAccess.MaterialGroups materialGroups = new DataAccess.MaterialGroups();
                materialGroups.Modify(modifiedMaterialGroup);
            }
            catch (Exception ex)
            {
                Trace.WriteError("({0})", Trace.GetMethodName(), CLASSNAME, ex, modifiedMaterialGroup);
                throw;
            }
        }