C#

public void liststudents()
           {

               for (int i = 0; i < studentarraylist.Count; i++)
               {
                   // Cast the object from the ArrayList to Student
                   Student currentStudent = (Student)studentarraylist[i];
                   Console.WriteLine("Student {0} {1}", currentStudent.FirstName, currentStudent.LastName);



               }
           }

ClsMgt da = new ClsMgt();
MySqlDataAdapter sqlDataMaster = new MySqlDataAdapter();
private DataSet oDs = null;
MySqlCommand selectcommand = null;
MySqlCommand insertcommand = null;
MySqlCommand updatecommand = null;
MySqlCommand deletecommand = null;
private DataTable dt = null;
private DataTable dtDet = null;
private String sSelProcName = null;
private String sInsProcName = null;
private String sDelProcName = null;
private String sUpdProcName = null;
private int voucType;

public MySqlConnection oCn = new MySqlConnection();
    MySqlTransaction oTrn = null;

public DataSet NewVoucher()
    {
     DataSet vDs = new DataSet();
     oCn = da.GetConnection();

     if (oCn == null)
       {
           oCn.Open();
       }
       try
       {
        DataTable dt = new DataTable();
            //===============================================================================
        //--- Set up the Select Command
            //===============================================================================
String sqlSelect = "Select vID, vTypeID, vNo, accCodeDR, accCodeCR, vDate, vChqNo, vChqDt, vPayName, vRemarks, vAmount from vMaster";
sqlDataMaster = new MySqlDataAdapter(sqlSelect, oCn);
sqlDataMaster.FillSchema(dt, SchemaType.Source);
  vDs.Tables.Add(dt);
  VoucherDetails vdet = new VoucherDetails();
  DataTable dtDet = new DataTable();
  dtDet = vdet.NewVoucherDet();

  vDs.Tables.Add(dtDet);

  vDs.Tables[0].Columns["vID"].AutoIncrement = true;
  vDs.Tables[0].Columns["vID"].AutoIncrementSeed = -1;
  vDs.Tables[0].Columns["vID"].AutoIncrementStep = -1;
  vDs.Tables[1].Columns["vID"].AutoIncrement = true;
  vDs.Tables[1].Columns["vID"].AutoIncrementSeed = -1;
  vDs.Tables[1].Columns["vID"].AutoIncrementStep = -1;
  vDs.EnforceConstraints = false;
 vDs.Relations.Add("VouchersToVoucherDetails", vDs.Tables[0].Columns["vID"], vDs.Tables[1].Columns["vID"]);

        }
        catch (MySqlException e)
        {
            MessageBox.Show(e.ToString());
        }

        return (vDs);
    }

public void SaveVoucher(DataSet oDs)
    {
        oCn = da.GetConnection();
        oTrn = oCn.BeginTransaction();
        sqlDataMaster = new MySqlDataAdapter();
        try
        {

        if (oCn == null)
         {
            oCn.Open();
         }

            //===============================================================================
//--- Set up the INSERT Command
           //===============================================================================
     sInsProcName = "prInsert_Voucher";
     insertcommand = new MySqlCommand(sInsProcName, oCn, oTrn);
     insertcommand.CommandType = CommandType.StoredProcedure;
    insertcommand.Parameters.Add(new MySqlParameter("nNewID", MySqlDbType.Int32, 0, "vID"));
  insertcommand.Parameters["nNewID"].Direction = ParameterDirection.Output;
  insertcommand.UpdatedRowSource = UpdateRowSource.OutputParameters;
  insertcommand.Parameters.Add("svTypeID", MySqlDbType.Int32,0, "vTypeID");
  insertcommand.Parameters.Add("svNo", MySqlDbType.Int32, 0, "vNo");
  insertcommand.Parameters.Add("svaccCodeDR", MySqlDbType.VarChar, 12, "accCodeDR");
  insertcommand.Parameters.Add("svaccCodeCR", MySqlDbType.VarChar, 12, "accCodeCR");
  insertcommand.Parameters.Add("svDate", MySqlDbType.DateTime);
 insertcommand.Parameters["svDate"].SourceColumn = "vDate";
 insertcommand.Parameters.Add("svChqNo", MySqlDbType.Int32, 0, "vChqNo");
 insertcommand.Parameters.Add("svChqDt", MySqlDbType.DateTime);
 insertcommand.Parameters["svChqDt"].SourceColumn = "vChqDt";
insertcommand.Parameters.Add("svPayName", MySqlDbType.VarChar, 100, "vPayName");
insertcommand.Parameters.Add("svRemarks", MySqlDbType.VarChar, 70, "vRemarks");
insertcommand.Parameters.Add("svAmount", MySqlDbType.Double, 0, "vAmount");

 sqlDataMaster.InsertCommand = insertcommand;
            //===============================================================================
 //--- Set up the UPDATE Command
            //===============================================================================
  sUpdProcName = "prUpdate_Voucher";
  updatecommand = new MySqlCommand(sUpdProcName, oCn, oTrn);
  updatecommand.CommandType = CommandType.StoredProcedure;
  updatecommand.Parameters.Add("nNewID", MySqlDbType.Int32, 4, "vID");
  updatecommand.Parameters.Add("svTypeID", MySqlDbType.Int32, 0, "CustomerID");
 updatecommand.Parameters.Add("svNo", MySqlDbType.Int32, 0, "vNo");
 updatecommand.Parameters.Add("svaccCodeDR", MySqlDbType.VarChar, 12, "accCodeDR");
 updatecommand.Parameters.Add("svaccCodeCR", MySqlDbType.VarChar, 12, "accCodeCR");
updatecommand.Parameters.Add("svDate", MySqlDbType.DateTime);
 updatecommand.Parameters["svDate"].SourceColumn = "vDate";
 updatecommand.Parameters.Add("svChqNo", MySqlDbType.Int32, 0, "vChqNo");
updatecommand.Parameters.Add("svChqDt", MySqlDbType.Date);
 updatecommand.Parameters["svChqDt"].SourceColumn = "vChqDt";
 updatecommand.Parameters.Add("svPayName", MySqlDbType.VarChar, 100, "vPayName");
 updatecommand.Parameters.Add("svRemarks", MySqlDbType.VarChar, 70, "vRemarks");
            updatecommand.Parameters.Add("svAmount", MySqlDbType.Double, 0, "vAmount");
sqlDataMaster.UpdateCommand = updatecommand;

           //===============================================================================
            //--- Set up the DELETE Command
            //===============================================================================
 sDelProcName = "prDelete_Voucher";
 deletecommand = new MySqlCommand(sDelProcName, oCn, oTrn);
 deletecommand.CommandType = CommandType.StoredProcedure;
 deletecommand.Parameters.Add("nNewID", MySqlDbType.Int32, 4, "vID");
 sqlDataMaster.DeleteCommand = deletecommand;

 sqlDataMaster.Update(oDs.Tables[0]);
 VoucherDetails vDet = new VoucherDetails();
 vDet.SaveVoucher(oTrn, oDs.Tables[1]);

 oTrn.Commit();
 MessageBox.Show("Records saved.", "Saving Records");
 }
 catch (MySqlException e)
        {
            //===============================================================================
 //--- Rollback the transaction
            //===============================================================================
 oTrn.Rollback();
//MessageBox.Show(e.ToString());
 MessageBox.Show(e.Message +" Error code: "+ e.Number);
oDs.Tables[0].Rows[0]["vNo"] = DBNull.Value;

 }

 }

DELIMITER $$
USE `generalledger`$$

DROP PROCEDURE IF EXISTS `prInsert_Voucher`$$

CREATE DEFINER=`root`@`localhost` PROCEDURE `prInsert_Voucher`(
IN svTypeID INT, 
IN svNo INT, 
IN svaccCodeDR VARCHAR(12),
IN svaccCodeCR VARCHAR(12), 
IN svDate DATETIME,
IN svChqNo INT, 
IN svChqDt DATETIME, 
IN svPayName VARCHAR(100), 
IN svRemarks VARCHAR(70), 
IN svAmount DOUBLE,  
OUT nNewID INT)
BEGIN

INSERT INTO vMaster (vTypeID, vNo, accCodeDR,accCodeCR,vDate, vChqNo, vChqDt, vPayName, vRemarks, vAmount)
VALUES (svTypeID, svNo, svaccCodeDR, svaccCodeCR, svDate, svChqNo, svChqDt, svPayName, svRemarks, svAmount);
SET nNewID = LAST_INSERT_ID();
END$$

DELIMITER ;

public frmVoucher()
    {
    InitializeComponent();
    DoNewVoucher();
   }

    private void Form1_Load(object sender, EventArgs e)
    {
     txtVDt.Text = DateTime.Today.ToString();
    }

   public void DoNewVoucher()
    {
      vr.VoucherType = 1;
      ds = vr.NewVoucher();

     //Create New binding source for Order
     bs = new BindingSource();
     //Create New binding source for Order Details
     bsDet = new BindingSource();
     //Set Order binding source to Dataset ds
     bs.DataSource = ds;
     //Set Order Data Member to Dataset ds table "Orders"
     bs.DataMember = "vMaster";
     //Set Order Details binding source to Order's Binding source
   bsDet.DataSource = bs;
 //Set Order Data Member to Dataset's Relationship for data integrity
  bsDet.DataMember = "VouchersToVoucherDetails";
  BindControls();

  bs.AddNew();
  txtVDt.Text = DateTime.Today.ToString();
 // txtChqDt.Text = DateTime.Today.ToString();
    }

public void BindControls()
    {
   txtvTypeID.Text = null;
   txtVType.Text = null;
   txtVNum.Text = null;
   txtVDesc.Text = null;
   txtVDt.Text = null;
   if (vr.VoucherType == 1)
     {
       txtChqNo.Text = null;
       txtChqDt.Text = null;
       txtDrAcc.Text = null;
       txtDrAccDesc.Text = null;
       txtCrAcc.Text = null;
       txtCrAccDesc.Text = null;
       txtPayName.Text = null;
       txtAmount.Text = null;
     }

     txtRemarks.Text = null;
     txtTransID.DataBindings.Clear();
     txtvTypeID.DataBindings.Clear();
     txtVType.DataBindings.Clear();
     txtVNum.DataBindings.Clear();
        txtVDt.DataBindings.Clear();
        if (vr.VoucherType == 1)
        {
            txtChqNo.DataBindings.Clear();
            txtChqDt.DataBindings.Clear();
            txtDrAcc.DataBindings.Clear();
            txtCrAcc.DataBindings.Clear();
            txtPayName.DataBindings.Clear();
            txtAmount.DataBindings.Clear();
        }
        txtRemarks.DataBindings.Clear();


 txtTransID.DataBindings.Add(new Binding("Text", bs, "vID"));
txtvTypeID.DataBindings.Add(new Binding("Text", bs, "vTypeID"));
txtVNum.DataBindings.Add(new Binding("Text", bs, "vNo"));
txtVDt.DataBindings.Add(new Binding("Text", bs, "vDate"));
  if (vr.VoucherType == 1)
     {
 txtChqNo.DataBindings.Add(new Binding("Text", bs, "vChqNo"));
 //string s = txtChqDt.Value.ToString("yyyy-MM-dd HH:mm");
 //DateTime dt = DateTime.ParseExact(txtChqDt.Text, "yyyy-MM-dd HH:mm", CultureInfo.InvariantCulture);
 txtChqDt.DataBindings.Add(new Binding("Text", bs, "vChqDt"));
 txtDrAcc.DataBindings.Add(new Binding("Text", bs, "accCodeDR"));
txtCrAcc.DataBindings.Add(new Binding("Text", bs, "accCodeCR"));
txtPayName.DataBindings.Add(new Binding("Text", bs, "vPayName"));
 txtAmount.DataBindings.Add(new Binding("Text", bs, "vAmount"));
        }
 txtRemarks.DataBindings.Add(new Binding("Text", bs, "vRemarks"));

  txtVDt.Text = DateTime.Today.ToString();
   if (vr.VoucherType == 1)
    {
      txtChqDt.Text = DateTime.Today.ToString();
     }

if (txtvTypeID.Text == null || txtvTypeID.Text == string.Empty)
    {
  //txtVType.Text = dm.GetData("Select vType from vType Where vTypeID = '" + txtvTypeID.Text + "'").Rows[0]["vType"].ToString();
    txtVType.Text = null;
    }
      else
   {

 txtVType.Text = dm.GetData("Select vType from vType Where vTypeID = '" + txtvTypeID.Text + "'").Rows[0]["vType"].ToString();

   }
   dgVDet.AutoGenerateColumns = false;
   dgVDet.DataSource = bsDet;

   dgVDet.Columns["vDetID"].DataPropertyName = "vDetID";
   dgVDet.Columns["vID"].DataPropertyName = "vID";
   dgVDet.Columns["accCode"].DataPropertyName = "accCode";
   dgVDet.Columns["accName"].DataPropertyName = "accName";
  dgVDet.Columns["accDebit"].DataPropertyName = "accDebit";
   dgVDet.Columns["accCredit"].DataPropertyName = "accCredit";
  dgVDet.Columns["accRemarks"].DataPropertyName = "accRemarks";

    //CalculateTotals();
    }

private void btnSave_Click(object sender, EventArgs e)
    {
   int rowCount = 0;
   rowCount = dgVDet.Rows.Count - 1;

     this.Validate();
     bs.EndEdit();
     double dCr = 0;
     double dDr = 0;
    Double.TryParse(txtTotDR.Text.ToString(), out dDr);
    Double.TryParse(txtTotCR.Text.ToString(), out dCr);

   if (!ds.HasChanges())
     {
   MessageBox.Show("No changes to save.", "Saving Records");
       return;
    }

    if (dCr != dDr)
      {
  MessageBox.Show("Total of Debit and Credit are not equal.", "Saving Records");
         return;
    }

  try
   {

  if (txtvTypeID.Text == null || txtvTypeID.Text == string.Empty)
            {
        return;
      }
     else
      {
   if (txtVNum.Text == null || txtVNum.Text == string.Empty)
     {
  int temp = int.Parse(this.txtvTypeID.Text.ToString());
  ds.Tables[0].Rows[0]["vNo"] = vr.GetVoucherNum(temp);
      }

     }


   vr.SaveVoucher(ds);
        }
       catch (MySqlException err)
        {

 // MessageBox.Show(err.Message.ToString() +" "+ err.ErrorCode );
     MessageBox.Show(err.ErrorCode.ToString());

        }

  CellSum(5);
  CellSum(6);
    }

public partial class PartIndexer : ServiceBase
{
    static string connectionString = "server=xxx;uid=xxx;password=xxx;database=xxx;Pooling=true;Connect Timeout=20;";
    SqlDependency dep;

    public PartIndexer()
    {
        InitializeComponent();
    }

    private string GetLoggedInUser()
    {
        string userName = "";
        if (System.Security.Principal.WindowsIdentity.GetCurrent() != null)
        {
            userName = System.Security.Principal.WindowsIdentity.GetCurrent().Name;
        }
        return userName;
    }

    #region OnStart
    protected override void OnStart(string[] args)
    {
        BBALogger.Write("PartIndexer Service OnStart called start", BBALogger.MsgType.Info);
        RegisterNotification();
        MailSend(); // notification mail send
        BBALogger.Write("PartIndexer Service OnStart called end, logged in user " + GetLoggedInUser(), BBALogger.MsgType.Info);
    }
    #endregion

    #region RegisterNotification
    /// 
    /// RegisterNotification
    /// this is main routine which will monitor data change in ContentChangeLog table
    /// 
    private void RegisterNotification()
    {
        string tmpdata = "";
        BBALogger.Write("PartIndexer Service RegisterNotification called start", BBALogger.MsgType.Info);

        System.Data.SqlClient.SqlDependency.Stop(connectionString);
        System.Data.SqlClient.SqlDependency.Start(connectionString);

        try
        {
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                SqlCommand cmd = conn.CreateCommand();
                cmd.CommandText = "SELECT TestTable FROM [dbo].ContentChangeLog";
                dep = new SqlDependency(cmd);
                dep.OnChange += new OnChangeEventHandler(OnDataChange);
                SqlDataReader dr = cmd.ExecuteReader();
                {
                    if (dr.HasRows)
                    {
                        dr.Read();
                        tmpdata = dr[0].ToString();
                    }
                }
                dr.Dispose();
                cmd.Dispose();
            }
        }
        catch (Exception ex)
        {
            BBALogger.Write("PartIndexer Service RegisterNotification Error "+ex.Message.ToString(), BBALogger.MsgType.Error);
        }
        finally
        {
            BBALogger.Write("PartIndexer Service RegisterNotification called end", BBALogger.MsgType.Info);

        }

    }
    #endregion

    #region OnDataChange
    /// 
    /// OnDataChange
    /// OnDataChange will fire when after data change found in ContentChangeLog table
    /// 
    /// 
    /// 
    void OnDataChange(object sender, SqlNotificationEventArgs e)
    {
        ((SqlDependency)sender).OnChange -= OnDataChange;

        BBALogger.Write("PartIndexer Service RegisterNotification called end", BBALogger.MsgType.Info);

        if (e.Source == SqlNotificationSource.Timeout)
        {
    MailSend(); // notification mail send
    BBALogger.Write("PartIndexer Service SqlNotificationSource.Timeout error", BBALogger.MsgType.Error);

            Environment.Exit(1);
        }
        else if (e.Source != SqlNotificationSource.Data)
        {
        MailSend(); // notification mail send
            BBALogger.Write("PartIndexer Service SqlNotificationSource.Data", BBALogger.MsgType.Error);

            Environment.Exit(1);
        }
        else if (e.Type == SqlNotificationType.Change)
        {
            StartIndex();
            BBALogger.Write("PartIndexer Service Data changed", BBALogger.MsgType.Info);
        }
        else
        {
            BBALogger.Write(string.Format("Ignored change notification {0}/{1} ({2})", e.Type, e.Info, e.Source), BBALogger.MsgType.Warnings);
        }

        RegisterNotification();
    }
     #endregion

    #region StartIndex
    /// 
    /// StartIndex
    /// this routine will call web service in bba reman website which will invoke routine to re-index data
    /// 
    void StartIndex()
    {
        // calling web service if change is notified

    }
    #endregion

    #region MailSend
    /// 
    /// MailNotify
    /// fire mail when apps start & exit
    /// 
    /// 
    void MailSend()
    {
    // mail send code
    }
    #endregion

    #region OnStop
    protected override void OnStop()
    {
        BBALogger.Write("PartIndexer Service StartIndex called end, logged in user " + GetLoggedInUser(), BBALogger.MsgType.Info);
        System.Data.SqlClient.SqlDependency.Stop(connectionString);
        MailNotify("STOPPED");
    }
    #endregion
}

static void displayinarray()
{
    int rows = 0;
    int averagewins;
    //in global     static OleDbConnection connection;
    //in main       connection = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=F:\\connected\\users.accdb");
    try
    {
        OleDbCommand command = new OleDbCommand("select * from users", connection);
        connection.Open();
        OleDbDataReader reader = command.ExecuteReader();
        while (reader.Read()) {rows++;};
        string[,] results = new string[6,rows];
        for (int loop = 0; loop <= rows; loop++)
        {
            results[0,loop] = reader.GetString(0);
            results[1,loop] = reader.GetString(1);
            results[2,loop] = reader.GetString(2);
            results[3,loop] = reader.GetInt32(3).ToString();
            results[4,loop] = reader.GetInt32(4).ToString();
            averagewins = (reader.GetInt32(4) / reader.GetInt32(3))*100;
            results[5,loop] = Convert.ToString(averagewins);
        }

        Console.Clear();
        Console.WriteLine("{0}", rows);
        Console.WriteLine("  ┌──────────────┬──────────────┬──────────────┬────────┬────────┬─────────┐");
        Console.WriteLine("  │ username     │ name         │ surname      │ played │ won    │ % won   │");
        Console.WriteLine("  ├──────────────┼──────────────┼──────────────┼────────┼────────┼─────────┤");

            for (int loop = 0; loop <= rows ; loop++)
        {
            Console.SetCursorPosition(2, loop + 4);
            Console.WriteLine("│ {0} ", results[0,loop]);
            Console.SetCursorPosition(17, loop + 4);
            Console.WriteLine("│ {0} ", results[1,loop]);
            Console.SetCursorPosition(32, loop + 4);
            Console.WriteLine("│ {0} ", results[2,loop]);
            Console.SetCursorPosition(47, loop + 4);
            Console.WriteLine("│ {0} ", results[3,loop]);
            Console.SetCursorPosition(56, loop + 4);
            Console.WriteLine("│ {0} ", results[4,loop]);
            Console.SetCursorPosition(65, loop + 4);
            Console.WriteLine("│ {0} ", results[5,loop]);
            Console.SetCursorPosition(75, loop + 4);
            Console.WriteLine("│");
        }
        Console.WriteLine("  └──────────────┴──────────────┴──────────────┴────────┴────────┴─────────┘");

        reader.Close();
        connection.Close();
    }
    catch (OleDbException e)
    {
        Console.WriteLine("error: {0}", e.Errors[0].Message);
    }
    Console.ReadLine();
}}