C#

OrderInfo customerChoices = new OrderInfo();

#region Appetizer ComboBox
        private void cmboBoxAppetizer_SelectedIndexChanged(object sender, EventArgs e)
        {
            switch (cmboBoxAppetizer.SelectedIndex)
            {
                case 0:
                    {

                        frmQuantity frmQuantity = new frmQuantity();
                        frmQuantity.Show();

                        customerChoices.Appetizer = cmboBoxAppetizer.Text;
                        label1.Text = customerChoices.Quantity
                    }
                    break;
                case 1:
                    {
                        frmQuantity frmQuantity = new frmQuantity();
                        frmQuantity.Show();
                    }
                    break;
                case 2:
                    {
                        frmQuantity frmQuantity = new frmQuantity();
                        frmQuantity.Show();
                    }
                    break;
                default:
                    {
                    }
                    break;
            }
        }
        #endregion 

public partial class frmQuantity : Form
    {
        OrderInfo customerChoices = new OrderInfo();

        public frmQuantity()
        {
            InitializeComponent();
        }

        private void txtBoxQuantity_TextChanged(object sender, EventArgs e)
        {
            txtBoxQuantity.MaxLength = Convert.ToInt32(txtBoxQuantity.Text);
        }

        private void btnOk_Click(object sender, EventArgs e)
        {
            customerChoices.Quantity = Convert.ToInt32(txtBoxQuantity.Text);
            
            this.Close();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }

class OrderInfo
    {

        int quantity;

        public int Quantity
        {
            get
            {
                return quantity;
            }
            set
            {
                quantity = value;
            }
        }

    }

protected  void   btnShow_Click(object sender, System.EventArgs e)
        {

           ReportDocument cryRpt = new ReportDocument();
            cryRpt.Load("CrystalReport3.rpt");

            TableLogOnInfos crtableLogoninfos = new TableLogOnInfos();
            TableLogOnInfo crtableLogoninfo = new TableLogOnInfo();
            ConnectionInfo crConnectionInfo = new ConnectionInfo();
            Tables CrTables;

            ParameterFieldDefinitions crParameterFieldDefinitions ;
            ParameterFieldDefinition crParameterFieldDefinition ;
            ParameterValues crParameterValues = new ParameterValues();
            ParameterDiscreteValue crParameterDiscreteValue = new ParameterDiscreteValue();

            crParameterDiscreteValue.Value =txtFrom.Text;
            crParameterFieldDefinitions = cryRpt.DataDefinition.ParameterFields;
            crParameterFieldDefinition = crParameterFieldDefinitions["Date1"];
            crParameterValues = crParameterFieldDefinition.CurrentValues;

            crParameterValues.Clear();
            crParameterValues.Add(crParameterDiscreteValue);
            crParameterFieldDefinition.ApplyCurrentValues(crParameterValues);

            crParameterDiscreteValue.Value = txtTo.Text;
            crParameterFieldDefinitions = cryRpt.DataDefinition.ParameterFields;
            crParameterFieldDefinition = crParameterFieldDefinitions["Date2"];
            crParameterValues = crParameterFieldDefinition.CurrentValues;

            crParameterValues.Add(crParameterDiscreteValue);
            crParameterFieldDefinition.ApplyCurrentValues(crParameterValues);
      
            crConnectionInfo.ServerName = "Server1";
            crConnectionInfo.DatabaseName = "Coupon Management.mdf";
            crConnectionInfo.UserID = "";
            crConnectionInfo.Password = "";

            CrTables = cryRpt.Database.Tables;
            foreach (CrystalDecisions.CrystalReports.Engine.Table CrTable in CrTables)
            {
                crtableLogoninfo = CrTable.LogOnInfo;
                crtableLogoninfo.ConnectionInfo = crConnectionInfo;
                CrTable.ApplyLogOnInfo(crtableLogoninfo);
            }

            CrystalReportViewer2.ReportSource = cryRpt;
            CrystalReportViewer2.RefreshReport(); 
        }