Text Field Validation: five digits
Imports System
Imports System.ComponentModel
Imports System.Windows.Forms
Imports System.Data
Imports System.Configuration
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Drawing.Text
Imports System.Globalization
Imports System.Text
Imports System.Collections
Public Class MainClass
Shared Sub Main()
Dim myform As Form = New Form1()
Application.Run(myform)
End Sub
End Class
Public Class Form1
Private Sub TextBox1_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles TextBox1.Validating, TextBox2.Validating, TextBox3.Validating
ValidateFiveDigits(DirectCast(sender, TextBox))
End Sub
Private Sub ValidateFiveDigits(ByVal text_box As TextBox)
If (text_box.Text.Length <> 0) And _
Not (text_box.Text Like "#####") _
Then
' Invalid. Set an error.
ErrorProvider1.SetError(text_box, _
text_box.Name & " must contain exactly five digits")
Else
' Valid. Clear the error.
ErrorProvider1.SetError(text_box, "")
End If
End Sub
Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
e.Cancel = True
If IsInvalidField(TextBox1) Then
Exit Sub
End If
If IsInvalidField(TextBox3) Then
Exit Sub
End If
e.Cancel = False
End Sub
Private Function IsInvalidField(ByVal ctl As Control) As Boolean
If ErrorProvider1.GetError(ctl).Length = 0 Then
Return False
Else
MessageBox.Show(ErrorProvider1.GetError(ctl))
ctl.Focus()
Return True
End If
End Function
End Class
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Public Class Form1
Inherits System.Windows.Forms.Form
'Form overrides dispose to clean up the component list.
<System.Diagnostics.DebuggerNonUserCode()> _
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing AndAlso components IsNot Nothing Then
components.Dispose()
End If
MyBase.Dispose(disposing)
End Sub
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
<System.Diagnostics.DebuggerStepThrough()> _
Private Sub InitializeComponent()
Me.components = New System.ComponentModel.Container
Me.Label1 = New System.Windows.Forms.Label
Me.TextBox1 = New System.Windows.Forms.TextBox
Me.TextBox2 = New System.Windows.Forms.TextBox
Me.Label2 = New System.Windows.Forms.Label
Me.TextBox3 = New System.Windows.Forms.TextBox
Me.Label3 = New System.Windows.Forms.Label
Me.ErrorProvider1 = New System.Windows.Forms.ErrorProvider(Me.components)
CType(Me.ErrorProvider1, System.ComponentModel.ISupportInitialize).BeginInit()
Me.SuspendLayout()
'
'Label1
'
Me.Label1.AutoSize = True
Me.Label1.Location = New System.Drawing.Point(8, 8)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(56, 13)
Me.Label1.TabIndex = 0
Me.Label1.Text = "Five Digits"
'
'TextBox1
'
Me.TextBox1.Location = New System.Drawing.Point(72, 8)
Me.TextBox1.Name = "TextBox1"
Me.TextBox1.Size = New System.Drawing.Size(80, 20)
Me.TextBox1.TabIndex = 1
'
'TextBox2
'
Me.TextBox2.Location = New System.Drawing.Point(72, 32)
Me.TextBox2.Name = "TextBox2"
Me.TextBox2.Size = New System.Drawing.Size(80, 20)
Me.TextBox2.TabIndex = 3
'
'Label2
'
Me.Label2.AutoSize = True
Me.Label2.Location = New System.Drawing.Point(8, 32)
Me.Label2.Name = "Label2"
Me.Label2.Size = New System.Drawing.Size(56, 13)
Me.Label2.TabIndex = 2
Me.Label2.Text = "Five Digits"
'
'TextBox3
'
Me.TextBox3.Location = New System.Drawing.Point(72, 56)
Me.TextBox3.Name = "TextBox3"
Me.TextBox3.Size = New System.Drawing.Size(80, 20)
Me.TextBox3.TabIndex = 5
'
'Label3
'
Me.Label3.AutoSize = True
Me.Label3.Location = New System.Drawing.Point(8, 56)
Me.Label3.Name = "Label3"
Me.Label3.Size = New System.Drawing.Size(56, 13)
Me.Label3.TabIndex = 4
Me.Label3.Text = "Five Digits"
'
'ErrorProvider1
'
Me.ErrorProvider1.ContainerControl = Me
'
'Form1
'
Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
Me.ClientSize = New System.Drawing.Size(210, 83)
Me.Controls.Add(Me.TextBox3)
Me.Controls.Add(Me.Label3)
Me.Controls.Add(Me.TextBox2)
Me.Controls.Add(Me.Label2)
Me.Controls.Add(Me.TextBox1)
Me.Controls.Add(Me.Label1)
Me.Name = "Form1"
Me.Text = "Deferred Validation"
CType(Me.ErrorProvider1, System.ComponentModel.ISupportInitialize).EndInit()
Me.ResumeLayout(False)
Me.PerformLayout()
End Sub
Friend WithEvents Label1 As System.Windows.Forms.Label
Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
Friend WithEvents Label2 As System.Windows.Forms.Label
Friend WithEvents TextBox3 As System.Windows.Forms.TextBox
Friend WithEvents Label3 As System.Windows.Forms.Label
Friend WithEvents ErrorProvider1 As System.Windows.Forms.ErrorProvider
End Class
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