1 // Student: Pat Moss
  2 // Instructor: Dave Hammer
  3 // CIS162AD C# 5832 - Worksheet #7 - Banking Application
  4 // 04/12/2006 Rev. 01a
  5 
  6 // III. Programming Exercise:
  7 //      Write source code for the following.
  8 //      Create a base banking account. Decide what characteristics are
  9 //      common for savings and checking accounts, and include these
 10 //      characteristics in the base class. Define subclasses for checking
 11 //      and savings. Include a presentation class to test your design.
 12 //      Turn in your source code for this program.
 13 
 14 using System;
 15 using System.Drawing;
 16 using System.Collections;
 17 using System.ComponentModel;
 18 using System.Windows.Forms;
 19 using System.Data;
 20 
 21 namespace worksheet07
 22 
 23 // frmTeller.cs
 24 {
 25   /// <summary>
 26   /// Summary description for frmTeller.
 27   /// </summary>
 28   public class frmTeller : System.Windows.Forms.Form
 29   {
 30     // Declare Checking and Savings accounts.
 31     // Derived from the base class Account.
 32     private CheckingAccount oCheckingAccount = new CheckingAccount();
 33     private SavingsAccount oSavingsAccount = new SavingsAccount();
 34 
 35     private System.Windows.Forms.Label label1;
 36     private System.Windows.Forms.Label label2;
 37     private System.Windows.Forms.Label label3;
 38     private System.Windows.Forms.TextBox txtAccountNumber;
 39     private System.Windows.Forms.TextBox txtBalance;
 40     private System.Windows.Forms.TextBox txtAmount;
 41     private System.Windows.Forms.GroupBox groupBox1;
 42     private System.Windows.Forms.RadioButton rdbChecking;
 43     private System.Windows.Forms.RadioButton rdbSavings;
 44     private System.Windows.Forms.Button btnGetBalance;
 45     private System.Windows.Forms.Button btnDeposit;
 46     private System.Windows.Forms.Button btnWithdraw;
 47     private System.Windows.Forms.Button btnHelp;
 48     private System.Windows.Forms.Button btnExit;
 49     /// <summary>
 50     /// Required designer variable.
 51     /// </summary>
 52     private System.ComponentModel.Container components = null;
 53 
 54     // Default constructor for the frmTeller form
 55     public frmTeller()
 56     {
 57       //
 58       // Required for Windows Form Designer support
 59       //
 60       InitializeComponent();
 61 
 62       //
 63       // TODO: Add any constructor code after InitializeComponent call
 64       //
 65     } // frmTeller
 66 
 67     /// <summary>
 68     /// Clean up any resources being used.
 69     /// </summary>
 70     protected override void Dispose( bool disposing )
 71     {
 72       if( disposing )
 73       {
 74         if (components != null)
 75         {
 76           components.Dispose();
 77         }
 78       }
 79       base.Dispose( disposing );
 80     } // Dispose
 81 
 82     #region Windows Form Designer generated code
 83     /// <summary>
 84     /// Required method for Designer support - do not modify
 85     /// the contents of this method with the code editor.
 86     /// </summary>
 87     private void InitializeComponent()
 88     {
 89     this.label1 = new System.Windows.Forms.Label();
 90     this.label2 = new System.Windows.Forms.Label();
 91     this.label3 = new System.Windows.Forms.Label();
 92     this.txtAccountNumber = new System.Windows.Forms.TextBox();
 93     this.txtBalance = new System.Windows.Forms.TextBox();
 94     this.txtAmount = new System.Windows.Forms.TextBox();
 95     this.groupBox1 = new System.Windows.Forms.GroupBox();
 96     this.rdbSavings = new System.Windows.Forms.RadioButton();
 97     this.rdbChecking = new System.Windows.Forms.RadioButton();
 98     this.btnGetBalance = new System.Windows.Forms.Button();
 99     this.btnDeposit = new System.Windows.Forms.Button();
100     this.btnWithdraw = new System.Windows.Forms.Button();
101     this.btnHelp = new System.Windows.Forms.Button();
102     this.btnExit = new System.Windows.Forms.Button();
103     this.groupBox1.SuspendLayout();
104     this.SuspendLayout();
105     //
106     // label1
107     //
108     this.label1.Location = new System.Drawing.Point(16, 16);
109     this.label1.Name = "label1";
110     this.label1.Size = new System.Drawing.Size(120, 24);
111     this.label1.TabIndex = 0;
112     this.label1.Text = "Account Number:";
113     //
114     // label2
115     //
116     this.label2.Location = new System.Drawing.Point(16, 40);
117     this.label2.Name = "label2";
118     this.label2.Size = new System.Drawing.Size(120, 24);
119     this.label2.TabIndex = 1;
120     this.label2.Text = "Balance:";
121     //
122     // label3
123     //
124     this.label3.Location = new System.Drawing.Point(16, 72);
125     this.label3.Name = "label3";
126     this.label3.Size = new System.Drawing.Size(120, 24);
127     this.label3.TabIndex = 2;
128     this.label3.Text = "Amount:";
129     //
130     // txtAccountNumber
131     //
132     this.txtAccountNumber.Location = new System.Drawing.Point(144, 8);
133     this.txtAccountNumber.Name = "txtAccountNumber";
134     this.txtAccountNumber.Size = new System.Drawing.Size(168, 22);
135     this.txtAccountNumber.TabIndex = 3;
136     this.txtAccountNumber.Text = "";
137     //
138     // txtBalance
139     //
140     this.txtBalance.Location = new System.Drawing.Point(144, 40);
141     this.txtBalance.Name = "txtBalance";
142     this.txtBalance.ReadOnly = true;
143     this.txtBalance.Size = new System.Drawing.Size(168, 22);
144     this.txtBalance.TabIndex = 4;
145     this.txtBalance.Text = "";
146     //
147     // txtAmount
148     //
149     this.txtAmount.Location = new System.Drawing.Point(144, 72);
150     this.txtAmount.Name = "txtAmount";
151     this.txtAmount.Size = new System.Drawing.Size(168, 22);
152     this.txtAmount.TabIndex = 5;
153     this.txtAmount.Text = "";
154     //
155     // groupBox1
156     //
157     this.groupBox1.Controls.Add(this.rdbSavings);
158     this.groupBox1.Controls.Add(this.rdbChecking);
159     this.groupBox1.Location = new System.Drawing.Point(16, 112);
160     this.groupBox1.Name = "groupBox1";
161     this.groupBox1.Size = new System.Drawing.Size(104, 72);
162     this.groupBox1.TabIndex = 6;
163     this.groupBox1.TabStop = false;
164     //
165     // rdbSavings
166     //
167     this.rdbSavings.Location = new System.Drawing.Point(8, 40);
168     this.rdbSavings.Name = "rdbSavings";
169     this.rdbSavings.Size = new System.Drawing.Size(88, 24);
170     this.rdbSavings.TabIndex = 1;
171     this.rdbSavings.Text = "Savings";
172     //
173     // rdbChecking
174     //
175     this.rdbChecking.Location = new System.Drawing.Point(8, 16);
176     this.rdbChecking.Name = "rdbChecking";
177     this.rdbChecking.Size = new System.Drawing.Size(88, 24);
178     this.rdbChecking.TabIndex = 0;
179     this.rdbChecking.Text = "Checking";
180     //
181     // btnGetBalance
182     //
183     this.btnGetBalance.Location = new System.Drawing.Point(144, 104);
184     this.btnGetBalance.Name = "btnGetBalance";
185     this.btnGetBalance.Size = new System.Drawing.Size(168, 24);
186     this.btnGetBalance.TabIndex = 7;
187     this.btnGetBalance.Text = "Get Balance";
188     this.btnGetBalance.Click += new System.EventHandler(this.btnGetBalance_Click);
189     //
190     // btnDeposit
191     //
192     this.btnDeposit.Location = new System.Drawing.Point(144, 136);
193     this.btnDeposit.Name = "btnDeposit";
194     this.btnDeposit.Size = new System.Drawing.Size(168, 24);
195     this.btnDeposit.TabIndex = 8;
196     this.btnDeposit.Text = "Deposit";
197     this.btnDeposit.Click += new System.EventHandler(this.btnDeposit_Click);
198     //
199     // btnWithdraw
200     //
201     this.btnWithdraw.Location = new System.Drawing.Point(144, 168);
202     this.btnWithdraw.Name = "btnWithdraw";
203     this.btnWithdraw.Size = new System.Drawing.Size(168, 24);
204     this.btnWithdraw.TabIndex = 9;
205     this.btnWithdraw.Text = "Withdraw";
206     this.btnWithdraw.Click += new System.EventHandler(this.btnWithdraw_Click);
207     //
208     // btnHelp
209     //
210     this.btnHelp.Location = new System.Drawing.Point(144, 200);
211     this.btnHelp.Name = "btnHelp";
212     this.btnHelp.Size = new System.Drawing.Size(168, 24);
213     this.btnHelp.TabIndex = 10;
214     this.btnHelp.Text = "Help";
215     this.btnHelp.Click += new System.EventHandler(this.btnHelp_Click);
216     //
217     // btnExit
218     //
219     this.btnExit.Location = new System.Drawing.Point(144, 232);
220     this.btnExit.Name = "btnExit";
221     this.btnExit.Size = new System.Drawing.Size(168, 24);
222     this.btnExit.TabIndex = 11;
223     this.btnExit.Text = "Exit";
224     this.btnExit.Click += new System.EventHandler(this.btnExit_Click);
225     //
226     // frmTeller
227     //
228     this.AutoScaleBaseSize = new System.Drawing.Size(7, 15);
229     this.ClientSize = new System.Drawing.Size(328, 270);
230     this.Controls.Add(this.btnExit);
231     this.Controls.Add(this.btnHelp);
232     this.Controls.Add(this.btnWithdraw);
233     this.Controls.Add(this.btnDeposit);
234     this.Controls.Add(this.btnGetBalance);
235     this.Controls.Add(this.groupBox1);
236     this.Controls.Add(this.txtAmount);
237     this.Controls.Add(this.txtBalance);
238     this.Controls.Add(this.txtAccountNumber);
239     this.Controls.Add(this.label3);
240     this.Controls.Add(this.label2);
241     this.Controls.Add(this.label1);
242     this.Font = new System.Drawing.Font("Microsoft Sans Serif", 9.75F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
243     this.Name = "frmTeller";
244     this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
245     this.Text = "Teller Entry";
246     this.Load += new System.EventHandler(this.frmTeller_Load);
247     this.groupBox1.ResumeLayout(false);
248     this.ResumeLayout(false);
249 
250   } // InitializeComponent()
251     #endregion
252 
253     /// <summary>
254     /// The main entry point for the application.
255     /// </summary>
256     [STAThread]
257     static void Main()
258     {
259       Application.Run(new frmTeller());
260     } // Main
261 
262     // frmTeller form load event
263     private void frmTeller_Load(object sender, System.EventArgs e)
264     {
265         rdbChecking.Checked = true;
266         txtAccountNumber.Focus();
267     } // frmTeller_Load
268 
269     // Validate the Account Number and radio buttons
270     // If they are ok, then
271     // Get the current Balance amount for this Account Number
272     private bool GetBalance()
273     {
274         txtBalance.Text = "";
275 
276         if (!ValidateAcctNo(txtAccountNumber.Text))
277         {
278             txtAccountNumber.Focus();
279             return false;
280         }
281 
282         if (!ValidateCkSav(rdbChecking.Checked, rdbSavings.Checked))
283         {
284             rdbChecking.Focus();
285             return false;
286         }
287 
288         try
289         {
290           if (rdbChecking.Checked)
291           {
292             oCheckingAccount.SetAccountNumber(Convert.ToInt32(txtAccountNumber.Text));
293             txtBalance.Text = oCheckingAccount.GetBalance().ToString("0.00");
294           }
295           else if (rdbSavings.Checked)
296           {
297             oSavingsAccount.SetAccountNumber(Convert.ToInt32(txtAccountNumber.Text));
298             txtBalance.Text = oSavingsAccount.GetBalance().ToString("0.00");
299           }
300         }
301         catch (Exception eException)
302         {
303             MessageBox.Show(eException.Message);
304             return false;
305         }
306 
307         return true;
308     } // GetBalance
309 
310     // Process the GetBalance button click event
311     private void btnGetBalance_Click(object sender, System.EventArgs e)
312     {
313         bool BalanceOk = GetBalance();
314     } // btnGetBalance_Click
315 
316     // Process the Deposit button event
317     private void btnDeposit_Click(object sender, System.EventArgs e)
318     {
319         bool BalanceOk = GetBalance();
320         if (!BalanceOk)
321         {
322            return;
323         }
324 
325         if (!ValidateAmt(txtAmount.Text))
326         {
327           txtAmount.Focus();
328           return;
329         }
330         else
331         {
332           txtAmount.Text = Convert.ToDouble(txtAmount.Text).ToString("0.00");
333         }
334 
335         try
336         {
337           if (rdbChecking.Checked)
338           {
339             txtBalance.Text = oCheckingAccount.Deposit(Convert.ToDouble(txtAmount.Text)).ToString("0.00");
340             // double dbl1 = Convert.ToDouble(txtAmount.Text);
341             // string str1 = Convert.ToString(oCheckingAccount.Deposit(dbl1));
342             // txtBalance.Text = str1;
343           }
344           else if (rdbSavings.Checked)
345           {
346             txtBalance.Text = oSavingsAccount.Deposit(Convert.ToDouble(txtAmount.Text)).ToString("0.00");
347           }
348         }
349         catch (Exception eException)
350         {
351           MessageBox.Show(eException.Message);
352         }
353     } // btnDeposit_Click
354 
355     // Process the Withdraw button click event
356     private void btnWithdraw_Click(object sender, System.EventArgs e)
357     {
358         bool BalanceOk = GetBalance();
359         if (!BalanceOk)
360         {
361            return;
362         }
363 
364         if (!ValidateAmt(txtAmount.Text))
365         {
366             txtAmount.Focus();
367             return;
368         }
369         else
370         {
371           txtAmount.Text = Convert.ToDouble(txtAmount.Text).ToString("0.00");
372         }
373 
374         try
375         {
376           if (rdbChecking.Checked)
377           {
378             txtBalance.Text = oCheckingAccount.Withdraw(Convert.ToDouble(txtAmount.Text)).ToString("0.00");
379           }
380           else if (rdbSavings.Checked)
381           {
382             txtBalance.Text = oSavingsAccount.Withdraw(Convert.ToDouble(txtAmount.Text)).ToString("0.00");
383           }
384         }
385         catch (Exception eException)
386         {
387           MessageBox.Show(eException.Message);
388         }
389     } // btnWithdraw_Click
390 
391     // Process the Help button click event
392     private void btnHelp_Click(object sender, System.EventArgs e)
393     {
394       string helpmsg = "";
395       helpmsg += "  1. Click on Checking or Savings.\n";
396       helpmsg += "  2. Enter an Account Number (1, 2, 3, 4, or 5).\n";
397       helpmsg += "  3. Click on Get Balance to view current balance.\n";
398       helpmsg += "  4. Enter an Amount and click on Deposit\n";
399       helpmsg += "       to make a Deposit.\n";
400       helpmsg += "  5. Enter an Amount and click on Withdraw\n";
401       helpmsg += "       to make a Withdrawal.\n";
402       helpmsg += "  6. Valid Account Numbers are 1, 2, 3, 4, and 5.\n";
403       helpmsg += "  7. Minimum balance for Checking is 0.00.\n";
404       helpmsg += "  8. Minimum balance for Savings is 50.00.\n";
405       helpmsg += "  9. Checking balances for this test implementation\n";
406       helpmsg += "       are stored in a five element array in RAM.\n";
407       helpmsg += "10. Savings balances for this test implementation\n";
408       helpmsg += "       are stored in a five element array in RAM.\n";
409       helpmsg += "11. Checking initial balances are 1000.00 delta 1000.00\n";
410       helpmsg += "       (i.e., Acct 1: 1000.00, ..., Acct 5: 5000.00).\n";
411       helpmsg += "12. Savings initial balances are 10000.00 delta 10000.00\n";
412       helpmsg += "       (i.e., Acct 1: 10000.00, ..., Acct 5: 50000.00).\n";
413 
414       MessageBox.Show(helpmsg, "User Help",
415         MessageBoxButtons.OK, MessageBoxIcon.Information,
416         MessageBoxDefaultButton.Button1);
417     } // btnHelp_Click
418 
419     // Process the Exit button click event
420     private void btnExit_Click(object sender, System.EventArgs e)
421     {
422       // this.Close();
423       Application.Exit();
424     } // btnExit_Click
425 
426   // = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
427 
428   // Utility functions
429 
430   // Validate the input Account Number as:
431   // a. Non-blank
432   // b. Numeric
433   // c. Integer
434   private bool ValidateAcctNo(string txtAcctNo)
435   {
436       try
437       {
438         if (txtAcctNo == "")
439         {
440         throw new Exception("Please enter an Account Number.");
441         }
442       }
443       catch (Exception eException)
444       {
445         MessageBox.Show(eException.Message);
446         return false;
447       }
448 
449       try
450       {
451         if (!IsNumeric(txtAcctNo))
452         {
453           throw new Exception("Please enter a numeric Account Number.");
454         }
455       }
456       catch (Exception eException)
457       {
458         MessageBox.Show(eException.Message);
459         return false;
460       }
461 
462       try
463       {
464         if (!IsInteger(txtAcctNo))
465         {
466           throw new Exception("Please enter an integer Account Number.");
467         }
468       }
469       catch (Exception eException)
470       {
471         MessageBox.Show(eException.Message);
472         return false;
473       }
474 
475       return true;
476   } // ValidateAcctNo
477 
478   // Validate the input Checkboxes for Checking/Savings
479   // One check box must be selected
480   private bool ValidateCkSav(bool rdbCk, bool rdbSav)
481   {
482      try
483      {
484         if (!rdbCk && !rdbSav)
485         {
486           throw new Exception("Please choose Checking or Savings.");
487         }
488       }
489       catch (Exception eException)
490       {
491         MessageBox.Show(eException.Message);
492         return false;
493       }
494 
495       return true;
496    } // ValidateCkSav
497 
498    // Validate the input Amount value as:
499    // a. Non-blank
500    // b. Numeric
501    private bool ValidateAmt(string txtAmount)
502    {
503       try
504       {
505         if (txtAmount == "")
506         {
507           throw new Exception("Please enter an Amount.");
508         }
509       }
510       catch (Exception eException)
511       {
512         MessageBox.Show(eException.Message);
513         return false;
514       }
515 
516       try
517       {
518         if (!IsNumeric(txtAmount))
519         {
520           throw new Exception("Please enter a numeric Amount.");
521         }
522       }
523       catch (Exception eException)
524       {
525         MessageBox.Show(eException.Message);
526         return false;
527       }
528 
529       try
530       {
531         if (Convert.ToDouble(txtAmount) < 0.00)
532         {
533           throw new Exception("Please enter a positive Amount.");
534         }
535       }
536       catch (Exception eException)
537       {
538         MessageBox.Show(eException.Message);
539         return false;
540       }
541 
542       return true;
543    } // ValidateAmt
544 
545    // Utility function "IsNumeric()"
546    public bool IsNumeric(string theValue)
547    {
548       try
549       {
550         Convert.ToDouble(theValue);
551         return true;
552       }
553       catch
554       {
555         return false;
556       }
557     } // IsNumeric
558 
559    // Utility function "IsInteger()"
560    public bool IsInteger(string theValue)
561    {
562       try
563       {
564         Convert.ToInt32(theValue);
565         return true;
566       }
567       catch
568       {
569         return false;
570       }
571     } // IsInteger
572  } // frmTeller
573 
574  // = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
575 
576  // BankingClasses.cs
577 
578   public abstract class Account
579   {
580     // Declare five initial balances for five Accounts.
581     // Note: Data is normally retrieved from a database.
582     // Hard coded in a five-element array for demo testing only.
583     private double [ ] AcctBalTbl =
584         new double [ ] { 0.00, 1000.00, 2000.00, 3000.00, 4000.00, 5000.00 };
585     private int AcctMin = 1;
586     private int AcctMax = 5;
587     private double MinBalance = 0.00;
588     private int m_intAcctNo = 0;
589 
590     public Account()   // Constructor with zero arguments
591     {
592         // Initialize five initial balances for five Accounts
593         for (int n = AcctMin; n<=AcctMax; n++)
594         {
595           AcctBalTbl [n] = n * 1000.00;
596         }
597     } // Account default constructor
598 
599     public Account(double dblDelta) // Constructor with one argument
600     {
601         // Initialize five initial balances for five Accounts
602         for (int n = AcctMin; n<=AcctMax; n++)
603         {
604           AcctBalTbl [n] = n * dblDelta;
605         }
606     } // Account one-argument constructor
607 
608     // AccountNumber property
609     protected int AccountNumber
610     {
611         get
612         {
613             return m_intAcctNo;
614         }
615         set
616         {
617             m_intAcctNo = value;
618         }
619     } // AccountNumber
620 
621     // Balance property
622     protected double Balance
623     {
624         get
625         {
626             return AcctBalTbl [AccountNumber];
627         }
628         set
629         {
630             AcctBalTbl [AccountNumber] = value;
631         }
632     } // Balance
633 
634     // Set the Account Number property
635     public virtual bool SetAccountNumber (int intAcctNo)
636     {
637       try
638       {
639         if ((intAcctNo >= AcctMin) && (intAcctNo <= AcctMax))
640         {
641           AccountNumber = intAcctNo;
642           return true;
643         }
644         else
645         {
646           AccountNumber = 0;
647           throw new Exception("This Account Number is undefined in the database.");
648         }
649       }
650       catch (Exception eException)
651       {
652         MessageBox.Show(eException.Message);
653         AccountNumber = 0;
654         return false;
655       }
656     } // SetAccountNumber
657 
658     public virtual double GetBalance()
659     {
660       return Balance;
661     } // GetBalance
662 
663     public virtual double GetMinimumBalance()
664     {
665       return MinBalance;
666     } // GetMinimumBalance
667 
668     public virtual double Deposit(double dblAmount)
669     {
670       Balance += dblAmount;
671       return Balance;
672     } // Deposit
673 
674     public virtual double Withdraw(double dblAmount)
675     {
676       try
677       {
678         if (Balance >= (dblAmount + GetMinimumBalance()))
679         {
680             Balance -= dblAmount;
681             return Balance;
682         }
683         else
684         {
685             throw new Exception("Not enough funds.");
686         }
687       }
688       catch (Exception eException)
689       {
690         MessageBox.Show(eException.Message);
691         return Balance;
692       }
693     } // Withdraw
694   } // public abstract class Account
695 
696   public class CheckingAccount : Account
697   {
698     private double CkMinBalance = 0.00;
699 
700     public CheckingAccount() // Constructor with zero arguments
701            : base(1000.00)   // Call base constructor with one argument
702     {
703     } // CheckingAccount default constructor
704 
705     public override double GetMinimumBalance()
706     {
707         return CkMinBalance;
708     } // GetMinimumBalance
709 
710     public override double Withdraw (double dblAmount)
711     {
712       try
713       {
714         if (Balance >= (dblAmount + GetMinimumBalance()))
715         {
716             Balance -= dblAmount;
717             return Balance;
718         }
719         else
720         {
721             throw new Exception("Not enough funds.");
722         }
723       }
724       catch (Exception eException)
725       {
726         MessageBox.Show(eException.Message);
727         return Balance;
728       }
729     } // Withdraw
730   } // CheckingAccount
731 
732   public class SavingsAccount : Account
733   {
734     private double SavMinBalance = 50.00;
735 
736     public SavingsAccount()  // Constructor with zero arguments
737            : base(10000.00)  // Call base constructor with one argument
738     {
739     } // SavingsAccount default constructor
740 
741     public override double GetMinimumBalance()
742     {
743         return SavMinBalance;
744     } // GetMinimumBalance
745 
746     public override double Withdraw (double dblAmount)
747     {
748       try
749       {
750         if (Balance >= (dblAmount + GetMinimumBalance()))
751         {
752             Balance -= dblAmount;
753             return Balance;
754         }
755         else
756         {
757             throw new Exception("Not enough funds.");
758         }
759       }
760       catch (Exception eException)
761       {
762         MessageBox.Show(eException.Message);
763         return Balance;
764       }
765     } // Withdraw
766   } // SavingsAccount
767 }  // namespace worksheet07