C# Question, Trying to get this code to work. Can someone try and take a look at it and tell me what is wrong with this code...

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace Reservations { public partial class Form1 : Form { public Form1() { InitializeComponent(); } public bool IsValidData() { if (!IsPresent(txtArrivalDate, "Arrival Date")) return false; if (!IsPresent(txtDepartureDate, "Departure Date")) return false; if (!IsDateTime(txtArrivalDate, "Arrival Date")) return false; if (!IsDateTime(txtDepartureDate, "Departure Date")) return false; if (!IsWithinRange(txtArrivalDate, "Arrival Date", DateTime.Now.Date, DateTime.Now.AddYears(5).Date)) return false; if (!IsWithinRange(txtDepartureDate, "Departure Date", DateTime.Now.Date, DateTime.Now.AddYears(5).Date)) return false; return true; } public bool IsPresent(TextBox textBox, string name) { if (textBox.Text == "") { MessageBox.Show(name + " is a required field.", "Entry Error"); textBox.Focus(); return false; } return true; } public bool IsDateTime(TextBox textBox, string name) { DateTime dt; if (!DateTime.TryParseExact(textBox.Text, "MM/dd/yyyy", new System.Globalization.CultureInfo("en-US"), System.Globalization.DateTimeStyles.None, out dt)) { MessageBox.Show(name + " Should be a valid date with valid format.", "Invalid date Error"); textBox.Focus(); return false; } return true; } public bool IsWithinRange(TextBox textBox, string name, DateTime min, DateTime max) { DateTime dt = DateTime.Parse(textBox.Text, new System.Globalization.CultureInfo("en-US")).Date; if (dt.Date < min.Date || dt.Date > max.Date) { MessageBox.Show(name + " Should be within the rage of 5 years from the curent date.", "Date Range Error"); textBox.Focus(); return false; } return true; } private void btnExit_Click(object sender, System.EventArgs e) { this.Close(); } private void btnCalculate_Click(object sender, EventArgs e) { if (IsValidData()) { DateTime dArival = DateTime.Parse(txtArrivalDate.Text, new System.Globalization.CultureInfo("en-US")); DateTime dDeparture = DateTime.Parse(txtDepartureDate.Text, new System.Globalization.CultureInfo("en-US")); if (dArival.Date < dDeparture.Date) { TimeSpan tsTimeSpan = dDeparture - dArival; int intNumOfDays = (int)tsTimeSpan.TotalDays; txtNights.Text = intNumOfDays.ToString(); double dblTotalPrice = 0; int txtI = 0; while (txtI < intNumOfDays) { DateTime dtTemp = dArival.AddDays(txtI); DayOfWeek dowNow = dtTemp.DayOfWeek; string strSWeek = dowNow.ToString(); if (strSWeek.Equals("Friday") || strSWeek.Equals("Saturday")) dblTotalPrice = dblTotalPrice + 150; else dblTotalPrice = dblTotalPrice + 120; txtI++; } txtTotalPrice.Text = dblTotalPrice.ToString("C2", System.Globalization.CultureInfo.GetCultureInfo("en-US")); double dblAvgPrice = dblTotalPrice / intNumOfDays; txtAvgPrice.Text = dblAvgPrice.ToString("C2", System.Globalization.CultureInfo.GetCultureInfo("en-US")); } else { MessageBox.Show("Departure date should be always after the arrival date.", "Invalid order of dates Error"); } } }

private void btnExit_Click_1(object sender, EventArgs e) { this.Close(); }

private void btnCalculate_Click_1(object sender, EventArgs e) {

} } }