TFS API: After renaming the Work Item Type GUID display instead of new name

HI All,

I am using WorkItemType object of this package Microsoft.TeamFoundation.WorkItemTracking.Client to access work item type of project.

I am dispalying each work item of specific project by first getting project work items then using name propery of WorkItemType  object.

foreach (WorkItemType wiType in project.WorkItemTypes)
                    {
                                                 wiTypeList.Add(wiType.Name);
                    }

Scenario after renaming one custom work item type these snippet started showing the GUID of renamed work item instead its new name

Reply ASAP