VB.Net/GUI/TextBox Validation

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TextBox Validating Event

<source lang="vbnet"> Imports System Imports System.Collections Imports System.Data Imports System.IO Imports System.Xml.Serialization Imports System.Windows.Forms Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Drawing.Text Imports System.Drawing.Printing

Public Class MainClass 

   Shared Sub Main()
      Dim form1 As Form = New Form1()
      Application.Run(form1) 
   End Sub

End Class


Public Class Form1 

   Inherits System.Windows.Forms.Form
  1. Region " Windows Form Designer generated code "
   Public Sub New()
       MyBase.New()
       "This call is required by the Windows Form Designer.
       InitializeComponent()
       "Add any initialization after the InitializeComponent() call
   End Sub
   "Form overrides dispose to clean up the component list.
   Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
       If disposing Then
           If Not (components Is Nothing) Then
               components.Dispose()
           End If
       End If
       MyBase.Dispose(disposing)
   End Sub
   Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
   Friend WithEvents Label1 As System.Windows.Forms.Label
   "Required by the Windows Form Designer
   Private components As System.ruponentModel.Container
   "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.TextBox1 = New System.Windows.Forms.TextBox()
       Me.Label1 = New System.Windows.Forms.Label()
       Me.SuspendLayout()
       "
       "TextBox1
       "
       Me.TextBox1.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
       Me.TextBox1.Location = New System.Drawing.Point(48, 104)
       Me.TextBox1.Name = "TextBox1"
       Me.TextBox1.Size = New System.Drawing.Size(192, 27)
       Me.TextBox1.TabIndex = 1
       Me.TextBox1.Text = ""
       "
       "Label1
       "
       Me.Label1.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
       Me.Label1.Location = New System.Drawing.Point(24, 24)
       Me.Label1.Name = "Label1"
       Me.Label1.Size = New System.Drawing.Size(232, 48)
       Me.Label1.TabIndex = 2
       Me.Label1.Text = "Type somthing"
       "
       "Form1
       "
       Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
       Me.ClientSize = New System.Drawing.Size(292, 268)
       Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Label1, Me.TextBox1})
       Me.Name = "Form1"
       Me.Text = "Key Event Examples"
       Me.ResumeLayout(False)
   End Sub
  1. End Region
   Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
   End Sub
   Public Sub TextBox1_Validating(ByVal sender As Object, _
     ByVal e As System.ruponentModel.CancelEventArgs) _
     Handles TextBox1.Validating
       " cancel the focus shift if the textbox is empty
        MessageBox.Show("Validating")
       If TextBox1.Text.Trim = Nothing Then e.Cancel = True
   End Sub

End Class 

      </source>


TextBox validation: validate in Button click event

<source lang="vbnet"> Imports System Imports System.Drawing Imports System.Windows.Forms

Public Class MainClass 

   Shared Sub Main()
       Dim form1 As Form = New Form1
       Application.Run(form1)

   End Sub

End Class Public Class Form1 

   Inherits System.Windows.Forms.Form
  1. Region " Windows Form Designer generated code "
   Public Sub New()
       MyBase.New()
       "This call is required by the Windows Form Designer.
       InitializeComponent()
       "Add any initialization after the InitializeComponent() call
   End Sub
   "Form overrides dispose to clean up the component list.
   Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
       If disposing Then
           If Not (components Is Nothing) Then
               components.Dispose()
           End If
       End If
       MyBase.Dispose(disposing)
   End Sub
   "Required by the Windows Form Designer
   Private components As System.ruponentModel.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.
   Friend WithEvents GroupBox1 As System.Windows.Forms.GroupBox
   Friend WithEvents Label2 As System.Windows.Forms.Label
   Friend WithEvents Label1 As System.Windows.Forms.Label
   Friend WithEvents txtFirstName As System.Windows.Forms.TextBox
   Friend WithEvents txtLastName As System.Windows.Forms.TextBox
   Friend WithEvents Button1 As System.Windows.Forms.Button
   Friend WithEvents errProvider As System.Windows.Forms.ErrorProvider
   Friend WithEvents txtEmail As System.Windows.Forms.TextBox
   Friend WithEvents Label3 As System.Windows.Forms.Label
   <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
       Me.GroupBox1 = New System.Windows.Forms.GroupBox()
       Me.Label2 = New System.Windows.Forms.Label()
       Me.Label1 = New System.Windows.Forms.Label()
       Me.txtFirstName = New System.Windows.Forms.TextBox()
       Me.txtLastName = New System.Windows.Forms.TextBox()
       Me.Button1 = New System.Windows.Forms.Button()
       Me.errProvider = New System.Windows.Forms.ErrorProvider()
       Me.txtEmail = New System.Windows.Forms.TextBox()
       Me.Label3 = New System.Windows.Forms.Label()
       Me.GroupBox1.SuspendLayout()
       Me.SuspendLayout()
       "
       "GroupBox1
       "
       Me.GroupBox1.Controls.AddRange(New System.Windows.Forms.Control() {Me.Label3, Me.txtEmail, Me.Label2, Me.Label1, Me.txtFirstName, Me.txtLastName})
       Me.GroupBox1.Location = New System.Drawing.Point(8, 8)
       Me.GroupBox1.Name = "GroupBox1"
       Me.GroupBox1.Size = New System.Drawing.Size(368, 124)
       Me.GroupBox1.TabIndex = 11
       Me.GroupBox1.TabStop = False
       "
       "Label2
       "
       Me.Label2.Location = New System.Drawing.Point(16, 52)
       Me.Label2.Name = "Label2"
       Me.Label2.Size = New System.Drawing.Size(64, 16)
       Me.Label2.TabIndex = 8
       Me.Label2.Text = "Last Name:"
       "
       "Label1
       "
       Me.Label1.Location = New System.Drawing.Point(16, 28)
       Me.Label1.Name = "Label1"
       Me.Label1.Size = New System.Drawing.Size(64, 16)
       Me.Label1.TabIndex = 7
       Me.Label1.Text = "First Name:"
       "
       "txtFirstName
       "
       Me.txtFirstName.Location = New System.Drawing.Point(84, 24)
       Me.txtFirstName.Name = "txtFirstName"
       Me.txtFirstName.Size = New System.Drawing.Size(152, 21)
       Me.txtFirstName.TabIndex = 4
       Me.txtFirstName.Text = ""
       "
       "txtLastName
       "
       Me.txtLastName.Location = New System.Drawing.Point(84, 48)
       Me.txtLastName.Name = "txtLastName"
       Me.txtLastName.Size = New System.Drawing.Size(152, 21)
       Me.txtLastName.TabIndex = 5
       Me.txtLastName.Text = ""
       "
       "Button1
       "
       Me.Button1.Location = New System.Drawing.Point(152, 204)
       Me.Button1.Name = "Button1"
       Me.Button1.Size = New System.Drawing.Size(76, 24)
       Me.Button1.TabIndex = 10
       Me.Button1.Text = "OK"
       "
       "txtEmail
       "
       Me.txtEmail.Location = New System.Drawing.Point(84, 84)
       Me.txtEmail.Name = "txtEmail"
       Me.txtEmail.Size = New System.Drawing.Size(152, 21)
       Me.txtEmail.TabIndex = 9
       Me.txtEmail.Text = ""
       "
       "Label3
       "
       Me.Label3.Location = New System.Drawing.Point(16, 88)
       Me.Label3.Name = "Label3"
       Me.Label3.Size = New System.Drawing.Size(64, 16)
       Me.Label3.TabIndex = 10
       Me.Label3.Text = "Email:"
       "
       "ErrorProviderValidation
       "
       Me.AutoScaleBaseSize = New System.Drawing.Size(5, 14)
       Me.ClientSize = New System.Drawing.Size(388, 238)
       Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.GroupBox1, Me.Button1})
       Me.Font = New System.Drawing.Font("Tahoma", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
       Me.Name = "ErrorProviderValidation"
       Me.Text = "ErrorProvider Validation"
       Me.GroupBox1.ResumeLayout(False)
       Me.ResumeLayout(False)
   End Sub
  1. End Region
   Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
       Dim InvalidInput As Boolean = False
       Dim ctrl As Control
       For Each ctrl In Me.GroupBox1.Controls
           If errProvider.GetError(ctrl) <> "" Then
               InvalidInput = True
               Exit For
           End If
       Next
       If InvalidInput = True Then
           MessageBox.Show("You still have invalid input.", "Invalid Input", MessageBoxButtons.OK, MessageBoxIcon.Warning)
       Else
           Me.Close()
       End If
   End Sub

End Class 


      </source>


TextBox validation: validate in Validating Event

<source lang="vbnet"> Imports System Imports System.Drawing Imports System.Windows.Forms

Public Class MainClass 

   Shared Sub Main()
       Dim form1 As Form = New Form1
       Application.Run(form1)

   End Sub

End Class Public Class Form1 

   Inherits System.Windows.Forms.Form
  1. Region " Windows Form Designer generated code "
   Public Sub New()
       MyBase.New()
       "This call is required by the Windows Form Designer.
       InitializeComponent()
       "Add any initialization after the InitializeComponent() call
   End Sub
   "Form overrides dispose to clean up the component list.
   Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
       If disposing Then
           If Not (components Is Nothing) Then
               components.Dispose()
           End If
       End If
       MyBase.Dispose(disposing)
   End Sub
   "Required by the Windows Form Designer
   Private components As System.ruponentModel.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.
   Friend WithEvents GroupBox1 As System.Windows.Forms.GroupBox
   Friend WithEvents Label2 As System.Windows.Forms.Label
   Friend WithEvents Label1 As System.Windows.Forms.Label
   Friend WithEvents txtFirstName As System.Windows.Forms.TextBox
   Friend WithEvents txtLastName As System.Windows.Forms.TextBox
   Friend WithEvents Button1 As System.Windows.Forms.Button
   Friend WithEvents errProvider As System.Windows.Forms.ErrorProvider
   Friend WithEvents txtEmail As System.Windows.Forms.TextBox
   Friend WithEvents Label3 As System.Windows.Forms.Label
   <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
       Me.GroupBox1 = New System.Windows.Forms.GroupBox()
       Me.Label2 = New System.Windows.Forms.Label()
       Me.Label1 = New System.Windows.Forms.Label()
       Me.txtFirstName = New System.Windows.Forms.TextBox()
       Me.txtLastName = New System.Windows.Forms.TextBox()
       Me.Button1 = New System.Windows.Forms.Button()
       Me.errProvider = New System.Windows.Forms.ErrorProvider()
       Me.txtEmail = New System.Windows.Forms.TextBox()
       Me.Label3 = New System.Windows.Forms.Label()
       Me.GroupBox1.SuspendLayout()
       Me.SuspendLayout()
       "
       "GroupBox1
       "
       Me.GroupBox1.Controls.AddRange(New System.Windows.Forms.Control() {Me.Label3, Me.txtEmail, Me.Label2, Me.Label1, Me.txtFirstName, Me.txtLastName})
       Me.GroupBox1.Location = New System.Drawing.Point(8, 8)
       Me.GroupBox1.Name = "GroupBox1"
       Me.GroupBox1.Size = New System.Drawing.Size(368, 124)
       Me.GroupBox1.TabIndex = 11
       Me.GroupBox1.TabStop = False
       "
       "Label2
       "
       Me.Label2.Location = New System.Drawing.Point(16, 52)
       Me.Label2.Name = "Label2"
       Me.Label2.Size = New System.Drawing.Size(64, 16)
       Me.Label2.TabIndex = 8
       Me.Label2.Text = "Last Name:"
       "
       "Label1
       "
       Me.Label1.Location = New System.Drawing.Point(16, 28)
       Me.Label1.Name = "Label1"
       Me.Label1.Size = New System.Drawing.Size(64, 16)
       Me.Label1.TabIndex = 7
       Me.Label1.Text = "First Name:"
       "
       "txtFirstName
       "
       Me.txtFirstName.Location = New System.Drawing.Point(84, 24)
       Me.txtFirstName.Name = "txtFirstName"
       Me.txtFirstName.Size = New System.Drawing.Size(152, 21)
       Me.txtFirstName.TabIndex = 4
       Me.txtFirstName.Text = ""
       "
       "txtLastName
       "
       Me.txtLastName.Location = New System.Drawing.Point(84, 48)
       Me.txtLastName.Name = "txtLastName"
       Me.txtLastName.Size = New System.Drawing.Size(152, 21)
       Me.txtLastName.TabIndex = 5
       Me.txtLastName.Text = ""
       "
       "Button1
       "
       Me.Button1.Location = New System.Drawing.Point(152, 204)
       Me.Button1.Name = "Button1"
       Me.Button1.Size = New System.Drawing.Size(76, 24)
       Me.Button1.TabIndex = 10
       Me.Button1.Text = "OK"
       "
       "txtEmail
       "
       Me.txtEmail.Location = New System.Drawing.Point(84, 84)
       Me.txtEmail.Name = "txtEmail"
       Me.txtEmail.Size = New System.Drawing.Size(152, 21)
       Me.txtEmail.TabIndex = 9
       Me.txtEmail.Text = ""
       "
       "Label3
       "
       Me.Label3.Location = New System.Drawing.Point(16, 88)
       Me.Label3.Name = "Label3"
       Me.Label3.Size = New System.Drawing.Size(64, 16)
       Me.Label3.TabIndex = 10
       Me.Label3.Text = "Email:"
       "
       "ErrorProviderValidation
       "
       Me.AutoScaleBaseSize = New System.Drawing.Size(5, 14)
       Me.ClientSize = New System.Drawing.Size(388, 238)
       Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.GroupBox1, Me.Button1})
       Me.Font = New System.Drawing.Font("Tahoma", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
       Me.Name = "ErrorProviderValidation"
       Me.Text = "ErrorProvider Validation"
       Me.GroupBox1.ResumeLayout(False)
       Me.ResumeLayout(False)
   End Sub
  1. End Region
   Private Sub txtName_Validating(ByVal sender As Object, ByVal e As System.ruponentModel.CancelEventArgs) Handles txtFirstName.Validating, txtLastName.Validating
       If CType(sender, TextBox).Text = "" Then
           errProvider.SetError(sender, "You must enter a first and last name.")
       Else
           errProvider.SetError(sender, "")
       End If
   End Sub

End Class 


      </source>


Text Field Validation: five digits

<source lang="vbnet"> Imports System Imports System.ruponentModel 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.ruponentModel.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.rupilerServices.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.ruponentModel.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.ruponents = New System.ruponentModel.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.ruponents)
       CType(Me.ErrorProvider1, System.ruponentModel.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.ruponentModel.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 

      </source>
Источник — «http://vbex.ru/index.php?title=VB.Net/GUI/TextBox_Validation&oldid=435»