Delete duplicate items from dataTable

.NET
1

Hi

can anyone help me with my code I am trying to delete duplicate items from freeTechslist dataTable if the same item is included in assignedtechsList Datatable
I Merge two table but can any one show me how to delete duplicate items


            DataTable freeTechslist = user.GetAllUsers();
            DataTable assignedtechsList  = Task.GetAllAssignedUserToTask(taskID);


            freeTechslist.Merge(assignedtechsList);
            freeTechslist.GetChanges();



            return freeTechslist;