public void RemoveUserFromProject(int userId, int projectId)
{
var user = this.userRepository.GetById(userId);
user.UserProjects.Remove(this.projectRepository.GetById(projectId));
this.userRepository.UpdateUser(user);
var project = this.projectRepository.GetById(projectId);
project.ProjectUsers.Remove(this.userRepository.GetById(userId));
this.projectRepository.Update(project);
}