Empty textboxes on a form

RIAS
RIAS used Ask the Experts™
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Hello,

Is there any ways I can  code to get all empty textboxes on a windows form.

Cheers
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Developer Analyst
Commented:
something like this

For Each tb As TextBox In Me.Controls.OfType(Of TextBox)()
  if tb.Text = "" then
   ' do something
  end if
Next

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Lokesh B RDeveloper
Top Expert 2015

Commented:
Hi,

You can clear as follows.

1. Write a function as below.

void ClearAllControls(Control con)
{
    foreach (Control c in con.Controls)
    {
      if (c is TextBox)
         ((TextBox)c).Clear();
      else
         ClearAllControls(c);
    }
}

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2. Call the function as below on button click

ClearAllControls(this);

Author

Commented:
Thanks ,don't want to clear but ,want to find empty textboxes
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Author

Commented:
Cheers!

Commented:
I should point out that while the proposed solution does enumerate textbox controls that are directly on the form, it does not enumerate textbox controls that are on child container controls that are on the form.  You must also check to see if the child control has children; e.g. -

Form1.vb -
Public Class Form1
	Private Sub OnLoad(sender As Object, e As EventArgs) Handles MyBase.Load
		For Each child In Controls.GetChildren(GetType(Label))
			child.Text = child.Parent.Name
		Next

		Label6.Text = String.Format("There is {0} Textbox Control on the Form", Controls.OfType(Of TextBox).Count)
		Label7.Text = String.Format("There are {0} Textbox Controls on the Form and in Containers", Controls.GetChildren(GetType(TextBox)).Count)
	End Sub
End Class

Module Extensions
	<System.Runtime.CompilerServices.Extension()> _
	Public Function GetChildren(source As Control.ControlCollection, Optional ByVal filter As Type = Nothing) As IEnumerable(Of Control)
		Dim children = New List(Of Control)
		For Each child As Control In source
			If child.GetType() Is If(filter IsNot Nothing, filter, GetType(Control)) Then children.Add(child)
			If child.HasChildren() Then children.AddRange(child.Controls.GetChildren(filter))
		Next
		Return children
	End Function
End Module

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Form1.Designer.vb -
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial 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)
        Try
            If disposing AndAlso components IsNot Nothing Then
                components.Dispose()
            End If
        Finally
            MyBase.Dispose(disposing)
        End Try
    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.TextBox1 = New System.Windows.Forms.TextBox()
		Me.Label1 = New System.Windows.Forms.Label()
		Me.Panel1 = New System.Windows.Forms.Panel()
		Me.Panel2 = New System.Windows.Forms.Panel()
		Me.Panel3 = New System.Windows.Forms.Panel()
		Me.Panel4 = New System.Windows.Forms.Panel()
		Me.Label5 = New System.Windows.Forms.Label()
		Me.TextBox5 = New System.Windows.Forms.TextBox()
		Me.Label4 = New System.Windows.Forms.Label()
		Me.TextBox4 = New System.Windows.Forms.TextBox()
		Me.Label3 = New System.Windows.Forms.Label()
		Me.TextBox3 = New System.Windows.Forms.TextBox()
		Me.Label2 = New System.Windows.Forms.Label()
		Me.TextBox2 = New System.Windows.Forms.TextBox()
		Me.Label6 = New System.Windows.Forms.Label()
		Me.Label7 = New System.Windows.Forms.Label()
		Me.Panel1.SuspendLayout()
		Me.Panel2.SuspendLayout()
		Me.Panel3.SuspendLayout()
		Me.Panel4.SuspendLayout()
		Me.SuspendLayout()
		'
		'TextBox1
		'
		Me.TextBox1.Location = New System.Drawing.Point(301, 10)
		Me.TextBox1.Name = "TextBox1"
		Me.TextBox1.Size = New System.Drawing.Size(100, 20)
		Me.TextBox1.TabIndex = 0
		'
		'Label1
		'
		Me.Label1.AutoSize = True
		Me.Label1.Location = New System.Drawing.Point(13, 13)
		Me.Label1.Name = "Label1"
		Me.Label1.Size = New System.Drawing.Size(28, 13)
		Me.Label1.TabIndex = 1
		Me.Label1.Text = "Text"
		'
		'Panel1
		'
		Me.Panel1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
		Me.Panel1.Controls.Add(Me.Panel2)
		Me.Panel1.Controls.Add(Me.Label2)
		Me.Panel1.Controls.Add(Me.TextBox2)
		Me.Panel1.Location = New System.Drawing.Point(12, 36)
		Me.Panel1.Name = "Panel1"
		Me.Panel1.Size = New System.Drawing.Size(389, 133)
		Me.Panel1.TabIndex = 2
		'
		'Panel2
		'
		Me.Panel2.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
		Me.Panel2.Controls.Add(Me.Panel3)
		Me.Panel2.Controls.Add(Me.Label3)
		Me.Panel2.Controls.Add(Me.TextBox3)
		Me.Panel2.Location = New System.Drawing.Point(6, 29)
		Me.Panel2.Name = "Panel2"
		Me.Panel2.Size = New System.Drawing.Size(380, 98)
		Me.Panel2.TabIndex = 4
		'
		'Panel3
		'
		Me.Panel3.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
		Me.Panel3.Controls.Add(Me.Panel4)
		Me.Panel3.Controls.Add(Me.Label4)
		Me.Panel3.Controls.Add(Me.TextBox4)
		Me.Panel3.Location = New System.Drawing.Point(6, 29)
		Me.Panel3.Name = "Panel3"
		Me.Panel3.Size = New System.Drawing.Size(371, 63)
		Me.Panel3.TabIndex = 5
		'
		'Panel4
		'
		Me.Panel4.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
		Me.Panel4.Controls.Add(Me.Label5)
		Me.Panel4.Controls.Add(Me.TextBox5)
		Me.Panel4.Location = New System.Drawing.Point(6, 29)
		Me.Panel4.Name = "Panel4"
		Me.Panel4.Size = New System.Drawing.Size(362, 29)
		Me.Panel4.TabIndex = 6
		'
		'Label5
		'
		Me.Label5.AutoSize = True
		Me.Label5.Location = New System.Drawing.Point(3, 6)
		Me.Label5.Name = "Label5"
		Me.Label5.Size = New System.Drawing.Size(28, 13)
		Me.Label5.TabIndex = 3
		Me.Label5.Text = "Text"
		'
		'TextBox5
		'
		Me.TextBox5.Location = New System.Drawing.Point(259, 3)
		Me.TextBox5.Name = "TextBox5"
		Me.TextBox5.Size = New System.Drawing.Size(100, 20)
		Me.TextBox5.TabIndex = 2
		'
		'Label4
		'
		Me.Label4.AutoSize = True
		Me.Label4.Location = New System.Drawing.Point(3, 6)
		Me.Label4.Name = "Label4"
		Me.Label4.Size = New System.Drawing.Size(28, 13)
		Me.Label4.TabIndex = 3
		Me.Label4.Text = "Text"
		'
		'TextBox4
		'
		Me.TextBox4.Location = New System.Drawing.Point(268, 3)
		Me.TextBox4.Name = "TextBox4"
		Me.TextBox4.Size = New System.Drawing.Size(100, 20)
		Me.TextBox4.TabIndex = 2
		'
		'Label3
		'
		Me.Label3.AutoSize = True
		Me.Label3.Location = New System.Drawing.Point(3, 6)
		Me.Label3.Name = "Label3"
		Me.Label3.Size = New System.Drawing.Size(28, 13)
		Me.Label3.TabIndex = 3
		Me.Label3.Text = "Text"
		'
		'TextBox3
		'
		Me.TextBox3.Location = New System.Drawing.Point(277, 3)
		Me.TextBox3.Name = "TextBox3"
		Me.TextBox3.Size = New System.Drawing.Size(100, 20)
		Me.TextBox3.TabIndex = 2
		'
		'Label2
		'
		Me.Label2.AutoSize = True
		Me.Label2.Location = New System.Drawing.Point(3, 6)
		Me.Label2.Name = "Label2"
		Me.Label2.Size = New System.Drawing.Size(28, 13)
		Me.Label2.TabIndex = 3
		Me.Label2.Text = "Text"
		'
		'TextBox2
		'
		Me.TextBox2.Location = New System.Drawing.Point(286, 3)
		Me.TextBox2.Name = "TextBox2"
		Me.TextBox2.Size = New System.Drawing.Size(100, 20)
		Me.TextBox2.TabIndex = 2
		'
		'Label6
		'
		Me.Label6.AutoSize = True
		Me.Label6.Location = New System.Drawing.Point(9, 172)
		Me.Label6.Name = "Label6"
		Me.Label6.Size = New System.Drawing.Size(28, 13)
		Me.Label6.TabIndex = 3
		Me.Label6.Text = "Text"
		'
		'Label7
		'
		Me.Label7.AutoSize = True
		Me.Label7.Location = New System.Drawing.Point(9, 198)
		Me.Label7.Name = "Label7"
		Me.Label7.Size = New System.Drawing.Size(28, 13)
		Me.Label7.TabIndex = 4
		Me.Label7.Text = "Text"
		'
		'Form1
		'
		Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
		Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
		Me.ClientSize = New System.Drawing.Size(413, 318)
		Me.Controls.Add(Me.Label7)
		Me.Controls.Add(Me.Label6)
		Me.Controls.Add(Me.Panel1)
		Me.Controls.Add(Me.Label1)
		Me.Controls.Add(Me.TextBox1)
		Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
		Me.Name = "Form1"
		Me.Text = "Form1"
		Me.Panel1.ResumeLayout(False)
		Me.Panel1.PerformLayout()
		Me.Panel2.ResumeLayout(False)
		Me.Panel2.PerformLayout()
		Me.Panel3.ResumeLayout(False)
		Me.Panel3.PerformLayout()
		Me.Panel4.ResumeLayout(False)
		Me.Panel4.PerformLayout()
		Me.ResumeLayout(False)
		Me.PerformLayout()

	End Sub
	Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
	Friend WithEvents Label1 As System.Windows.Forms.Label
	Friend WithEvents Panel1 As System.Windows.Forms.Panel
	Friend WithEvents Panel2 As System.Windows.Forms.Panel
	Friend WithEvents Panel3 As System.Windows.Forms.Panel
	Friend WithEvents Panel4 As System.Windows.Forms.Panel
	Friend WithEvents Label5 As System.Windows.Forms.Label
	Friend WithEvents TextBox5 As System.Windows.Forms.TextBox
	Friend WithEvents Label4 As System.Windows.Forms.Label
	Friend WithEvents TextBox4 As System.Windows.Forms.TextBox
	Friend WithEvents Label3 As System.Windows.Forms.Label
	Friend WithEvents TextBox3 As System.Windows.Forms.TextBox
	Friend WithEvents Label2 As System.Windows.Forms.Label
	Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
	Friend WithEvents Label6 As System.Windows.Forms.Label
	Friend WithEvents Label7 As System.Windows.Forms.Label
End Class

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Which produces the following output -Capture.JPG-saige-

Author

Commented:
Thanks Sir!

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