Error Provider 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 ErrorProviderValidation.
/// </summary>
public class ErrorProviderValidation : System.Windows.Forms.Form
{
internal System.Windows.Forms.Label Label3;
internal System.Windows.Forms.TextBox txtEmail;
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;
internal System.Windows.Forms.ErrorProvider errProvider;
internal System.Windows.Forms.GroupBox grpValidation;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;
public ErrorProviderValidation()
{
//
// 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.grpValidation = new System.Windows.Forms.GroupBox();
this.Label3 = new System.Windows.Forms.Label();
this.txtEmail = new System.Windows.Forms.TextBox();
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.errProvider = new System.Windows.Forms.ErrorProvider();
this.grpValidation.SuspendLayout();
this.SuspendLayout();
//
// grpValidation
//
this.grpValidation.Controls.AddRange(new System.Windows.Forms.Control[] {
this.Label3,
this.txtEmail,
this.Label2,
this.Label1,
this.txtFirstName,
this.txtLastName});
this.grpValidation.Location = new System.Drawing.Point(8, 8);
this.grpValidation.Name = "grpValidation";
this.grpValidation.Size = new System.Drawing.Size(368, 124);
this.grpValidation.TabIndex = 13;
this.grpValidation.TabStop = false;
//
// Label3
//
this.Label3.Location = new System.Drawing.Point(16, 88);
this.Label3.Name = "Label3";
this.Label3.Size = new System.Drawing.Size(64, 16);
this.Label3.TabIndex = 10;
this.Label3.Text = "Email:";
//
// txtEmail
//
this.txtEmail.Location = new System.Drawing.Point(84, 84);
this.txtEmail.Name = "txtEmail";
this.txtEmail.Size = new System.Drawing.Size(152, 21);
this.txtEmail.TabIndex = 9;
this.txtEmail.Text = "";
this.txtEmail.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.txtEmail_KeyPress);
//
// 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, 204);
this.Button1.Name = "Button1";
this.Button1.Size = new System.Drawing.Size(76, 24);
this.Button1.TabIndex = 12;
this.Button1.Text = "OK";
this.Button1.Click += new System.EventHandler(this.Button1_Click);
//
// errProvider
//
this.errProvider.DataMember = null;
//
// ErrorProviderValidation
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 14);
this.ClientSize = new System.Drawing.Size(388, 242);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.grpValidation,
this.Button1});
this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.Name = "ErrorProviderValidation";
this.Text = "ErrorProviderValidation";
this.grpValidation.ResumeLayout(false);
this.ResumeLayout(false);
}
#endregion
[STAThread]
static void Main()
{
Application.Run(new ErrorProviderValidation());
}
private void Button1_Click(object sender, System.EventArgs e)
{
bool invalidInput = false;
foreach (Control ctrl in this.grpValidation.Controls)
{
if (errProvider.GetError(ctrl) != "")
{
invalidInput = true;
break;
}
}
if (invalidInput)
{
MessageBox.Show("You still have invalid input.", "Invalid Input", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
else
{
this.Close();
}
}
private void txtName_Validating(object sender, System.ComponentModel.CancelEventArgs e)
{
Control ctrl = (Control)sender;
if (ctrl.Text == "")
{
errProvider.SetError(ctrl, "You must enter a first and last name.");
}
else
{
errProvider.SetError(ctrl, "");
}
}
private void txtEmail_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
{
System.Text.RegularExpressions.Regex regex;
regex = new System.Text.RegularExpressions.Regex(@"\S+@\S+\.\S+");
Control ctrl = (Control)sender;
if (regex.IsMatch(ctrl.Text))
{
errProvider.SetError(ctrl, "");
}
else
{
errProvider.SetError(ctrl, "Not a valid email.");
}
}
}
}
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