on code 

partial class ATMSimulator
{
      #region Designer generated code

      /// 
 
      /// Required method for Designer support - do not modify 
      /// the contents of this method with the code editor.
      /// 
      [System.Diagnostics.DebuggerNonUserCode]
      private void InitializeComponent()
      {
          this.CanModifyActivities = true;
          System.Workflow.Activities.CodeCondition codecondition1 = new System.Workflow.Activities.CodeCondition();
          this.DispatchAmount = new System.Workflow.Activities.CodeActivity();
          this.GatherAmountInput = new System.Workflow.Activities.CodeActivity();
          this.CashWithdrawalSequence = new System.Workflow.Activities.SequenceActivity();
          this.WhileUserNeedsATMService = new System.Workflow.Activities.WhileActivity();
          // 
          // DispatchAmount
          // 
          this.DispatchAmount.Name = "DispatchAmount";
          this.DispatchAmount.ExecuteCode += new System.EventHandler(this.DispatchAmount_ExecuteCode);
          // 
          // GatherAmountInput
          // 
          this.GatherAmountInput.Name = "GatherAmountInput";
          this.GatherAmountInput.ExecuteCode += new System.EventHandler(this.GatherAmountInput_ExecuteCode);
          // 
          // CashWithdrawalSequence
          // 
          this.CashWithdrawalSequence.Activities.Add(this.GatherAmountInput); 3
          this.CashWithdrawalSequence.Activities.Add(this.DispatchAmount);
          this.CashWithdrawalSequence.Name = "CashWithdrawalSequence";
          // 
          // WhileUserNeedsATMService
          // 
          this.WhileUserNeedsATMService.Activities.Add(this.CashWithdrawalSequence);2
          codecondition1.Condition += new System.EventHandler  ( his.CheckUserNeedsATMService);
          this.WhileUserNeedsATMService.Condition = codecondition1; 4
          this.WhileUserNeedsATMService.Name = "WhileUserNeedsATMService";
          // 
          // ATMSimulator
          // 
          this.Activities.Add(this.WhileUserNeedsATMService);
          this.Name = "ATMSimulator";
          this.CanModifyActivities = false;

      }

      #endregion

      private CodeActivity DispatchAmount;
      private SequenceActivity CashWithdrawalSequence;
      private WhileActivity WhileUserNeedsATMService; 1
      private CodeActivity GatherAmountInput;

}

The major differnce from the Part 1 in this workflow is the inclusion of WhileActivity 1 so that the user can make more than one transaction in one go. WhileActivity is a CompositeActivity so it can conatin other activities 2.  Since WhileActivity can execute only single activity, the previous activities are packaged in to a single SequenceActivity 3 and given to the WhileActivity 2. The Condition property of WhileActivity, which is set to an instance of CodeCondition 4 in this code, determines whether the WhileActivity should proceed or halt.

public sealed partial class ATMSimulator : SequentialWorkflowActivity
{
      private int amountToWithdraw = 0;
      private bool userNeedsService = true;

      public ATMSimulator()
      {
          InitializeComponent();
      }
      private void GatherAmountInput_ExecuteCode(object sender, EventArgs e) 1
      {
          Console.WriteLine("please sepecify the amount to withdraw");
          amountToWithdraw = int.Parse(Console.ReadLine());
      }

      private void DispatchAmount_ExecuteCode(object sender, EventArgs e) 2
      {
          Console.WriteLine(String.Format("Please collect {0:c} from the ATM", amountToWithdraw));
          Console.WriteLine("Enter Q to quit");
          userNeedsService = !Console.ReadLine().Equals("Q", StringComparison.OrdinalIgnoreCase); 3
       }

      private void CheckUserNeedsATMService(object sender, ConditionalEventArgs e) 4
      {
          e.Result = userNeedsService; 5
      }


}

The sequence activities are executed 1 2 in the first go and sets whether the user needs to do further transactions 3. Based on the user's preference, CodeCondition event handler 4 sets the Result to a boolean value to signal whether the while loop should halt or proceed 5.