Workflow Sequence Task

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SharePoint2013

Hi i need to assign single task to multiple users through visual studio code.
But while assigning task to multiple person its not allowing more than one.
Can any one help to overcome this issue.

My code something like this

createTask1_TaskId1 = Guid.NewGuid();
           createTask1_TaskProperties1.Title = "Hr Superviser";
           createTask1_TaskProperties1.Description = "Task created using HR Manager";
           createTask1_TaskProperties1.StartDate = DateTime.Now;
           createTask1_TaskProperties1.DueDate = DateTime.Now.AddDays(5);
           createTask1_TaskProperties1.AssignedTo = WorkflowProperties.Item["Employee"].ToString();