using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; class MainClass { public static void Main() { Phone frm = new Phone(); while (true) { frm.ShowDialog(); if (frm.DialogResult == DialogResult.OK) { Console.WriteLine(frm.PhoneNumber); if (frm.PhoneNumber.Length == 8 | frm.PhoneNumber.Length == 12) { break; } else { MessageBox.Show("Phone number was not formatted correctly. Please correct entry."); } } else if (frm.DialogResult == DialogResult.Cancel) { Console.WriteLine("Form was canceled."); break; } } frm.Close(); } } class Phone : Form { private System.Windows.Forms.TextBox textBox1 = new System.Windows.Forms.TextBox(); private System.Windows.Forms.Label label1 = new System.Windows.Forms.Label() ; private System.Windows.Forms.Button btnOK = new System.Windows.Forms.Button(); private System.Windows.Forms.Button btnCancel = new System.Windows.Forms.Button(); public Phone() { this.SuspendLayout(); this.textBox1.Location = new System.Drawing.Point(122, 21); this.textBox1.Margin = new System.Windows.Forms.Padding(1, 3, 3, 3); this.textBox1.Size = new System.Drawing.Size(115, 20); this.label1.AutoSize = true; this.label1.Location = new System.Drawing.Point(10, 26); this.label1.Margin = new System.Windows.Forms.Padding(3, 3, 1, 3); this.label1.Size = new System.Drawing.Size(110, 14); this.label1.Text = "Enter phone number:"; this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleRight; this.btnOK.DialogResult = System.Windows.Forms.DialogResult.OK; this.btnOK.Location = new System.Drawing.Point(36, 65); this.btnOK.Text = "OK"; this.btnCancel.DialogResult = System.Windows.Forms.DialogResult.Cancel; this.btnCancel.Location = new System.Drawing.Point(132, 65); this.btnCancel.Text = "Cancel"; this.ClientSize = new System.Drawing.Size(270, 107); this.Controls.Add(this.btnCancel); this.Controls.Add(this.btnOK); this.Controls.Add(this.label1); this.Controls.Add(this.textBox1); this.ResumeLayout(false); this.PerformLayout(); btnOK.DialogResult = DialogResult.OK; btnCancel.DialogResult = DialogResult.Cancel; } public string PhoneNumber { get { return textBox1.Text; } set { textBox1.Text = value; } } }