/// <summary>
        /// Creates a link between parent and child work item with a comment.
        /// </summary>
        /// <param name="parentId">The parent id.</param>
        /// <param name="childId">The child id.</param>
        /// <param name="comment">A comment.</param>
        public void AddLinkToWorkItem(int parentId, int childId, string comment)
        {
            var workItemLink = new InMemoryWorkItemLink
            {
                RelatedWorkItemId = childId,
                Comment           = comment
            };

            this.workItems.Single(w => w.Id == parentId).Links.Add(workItemLink);
        }
 /// <summary>
 /// Creates a link between parent and child work item with a comment.
 /// </summary>
 /// <param name="parentId">The parent id.</param>
 /// <param name="childId">The child id.</param>
 /// <param name="comment">A comment.</param>
 public void AddLinkToWorkItem(int parentId, int childId, string comment)
 {
     var workItemLink = new InMemoryWorkItemLink
                            {
                                RelatedWorkItemId = childId,
                                Comment = comment
                            };
     this.workItems.Single(w => w.Id == parentId).Links.Add(workItemLink);
 }