Simple Form Validation
/*
User Interfaces in C#: Windows Forms and Custom Controls
by Matthew MacDonald
Publisher: Apress
ISBN: 1590590457
*/
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
namespace Validation
{
/// <summary>
/// Summary description for SimpleValidation.
/// </summary>
public class SimpleValidation : System.Windows.Forms.Form
{
internal System.Windows.Forms.GroupBox GroupBox1;
internal System.Windows.Forms.Label Label2;
internal System.Windows.Forms.Label Label1;
internal System.Windows.Forms.TextBox txtFirstName;
internal System.Windows.Forms.TextBox txtLastName;
internal System.Windows.Forms.Button Button1;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;
public SimpleValidation()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent call
//
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if(components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.GroupBox1 = new System.Windows.Forms.GroupBox();
this.Label2 = new System.Windows.Forms.Label();
this.Label1 = new System.Windows.Forms.Label();
this.txtFirstName = new System.Windows.Forms.TextBox();
this.txtLastName = new System.Windows.Forms.TextBox();
this.Button1 = new System.Windows.Forms.Button();
this.GroupBox1.SuspendLayout();
this.SuspendLayout();
//
// GroupBox1
//
this.GroupBox1.Controls.AddRange(new System.Windows.Forms.Control[] {
this.Label2,
this.Label1,
this.txtFirstName,
this.txtLastName});
this.GroupBox1.Location = new System.Drawing.Point(8, 12);
this.GroupBox1.Name = "GroupBox1";
this.GroupBox1.Size = new System.Drawing.Size(368, 88);
this.GroupBox1.TabIndex = 11;
this.GroupBox1.TabStop = false;
//
// Label2
//
this.Label2.Location = new System.Drawing.Point(16, 52);
this.Label2.Name = "Label2";
this.Label2.Size = new System.Drawing.Size(64, 16);
this.Label2.TabIndex = 8;
this.Label2.Text = "Last Name:";
//
// Label1
//
this.Label1.Location = new System.Drawing.Point(16, 28);
this.Label1.Name = "Label1";
this.Label1.Size = new System.Drawing.Size(64, 16);
this.Label1.TabIndex = 7;
this.Label1.Text = "First Name:";
//
// txtFirstName
//
this.txtFirstName.Location = new System.Drawing.Point(84, 24);
this.txtFirstName.Name = "txtFirstName";
this.txtFirstName.Size = new System.Drawing.Size(152, 21);
this.txtFirstName.TabIndex = 4;
this.txtFirstName.Text = "";
this.txtFirstName.Validating += new System.ComponentModel.CancelEventHandler(this.txtName_Validating);
//
// txtLastName
//
this.txtLastName.Location = new System.Drawing.Point(84, 48);
this.txtLastName.Name = "txtLastName";
this.txtLastName.Size = new System.Drawing.Size(152, 21);
this.txtLastName.TabIndex = 5;
this.txtLastName.Text = "";
this.txtLastName.Validating += new System.ComponentModel.CancelEventHandler(this.txtName_Validating);
//
// Button1
//
this.Button1.Location = new System.Drawing.Point(152, 208);
this.Button1.Name = "Button1";
this.Button1.Size = new System.Drawing.Size(76, 24);
this.Button1.TabIndex = 10;
this.Button1.Text = "OK";
this.Button1.Click += new System.EventHandler(this.Button1_Click);
//
// SimpleValidation
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 14);
this.ClientSize = new System.Drawing.Size(384, 242);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.GroupBox1,
this.Button1});
this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.Name = "SimpleValidation";
this.Text = "SimpleValidation";
this.GroupBox1.ResumeLayout(false);
this.ResumeLayout(false);
}
#endregion
private void Button1_Click(object sender, System.EventArgs e)
{
this.Close();
}
[STAThread]
static void Main()
{
Application.Run(new SimpleValidation());
}
private void txtName_Validating(object sender, System.ComponentModel.CancelEventArgs e)
{
if (((TextBox)sender).Text == "")
{
MessageBox.Show("You must enter a first and last name.", "Invalid Input", MessageBoxButtons.OK, MessageBoxIcon.Warning);
e.Cancel = true;
}
}
}
}
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