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TextBox Control for Visual Basic 6.0 Users

The TextBox control in Visual Basic 6.0 is replaced by the Windows Forms TextBox control in Visual Basic 2008. The names of some properties, methods, events, and constants are different, and in some cases there are differences in behavior.

In Visual Basic 6.0, the MaxLength property determines the number of characters that can be entered into a TextBox control. If you attempt to insert text programmatically, the text will be truncated at the length specified by the MaxLength property.

In Visual Basic 2008, the behavior of the MaxLength property no longer applies to text that is added programmatically. To duplicate the Visual Basic 6.0 behavior, you need to truncate the string yourself.

In Visual Basic 6.0, the PasswordChar property is of type String; in Visual Basic 2008 it is of type Char.

In addition, there are numerous conceptual differences that apply to all controls, including differences in data binding, font handling, drag-and-drop operations, Help support and more. For more information, see Windows Forms Concepts for Visual Basic 6.0 Users.

The following examples illustrate differences in coding techniques between Visual Basic 6.0 and Visual Basic 2008.

Code Changes for Searching in a TextBox Control

The following code demonstrates how to search for a string in a TextBox control and highlight it.

' Visual Basic 6.0
Private Sub Form_Load ()
    Text1.Text = "Two of the peak human experiences"
    Text1.Text = Text1.Text & " are good food and classical music."
End Sub
Private Sub Form_Click ()
    Dim Search, Where
    ' Get search string from user.
    Search = InputBox("Enter text to be found:")
    ' Find string in text.
    Where = InStr(Text1.Text, Search)
    If Where Then
        Text1.SetFocus
        Text1.SelStart = Where - 1
        Text1.SelLength = Len(Search)
    Else
        MsgBox "String not found."
    End If
End Sub
' Visual Basic
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As _
System.EventArgs) Handles MyBase.Load
    TextBox1.Text = "Two of the peak human experiences are "
    TextBox1.Text = TextBox1.Text & "good food and classical music."
End Sub
Private Sub Form1_Click(ByVal sender As Object, ByVal e As _
System.EventArgs) Handles Me.Click
    Dim Search As String
    Dim Where As String
    ' Get search string from user.
    Search = InputBox("Enter text to be found:")
    ' Find string in text.
    Where = InStr(TextBox1.Text, Search)
    If Where Then
        TextBox1.Focus()
        TextBox1.SelectionStart = Where - 1
        TextBox1.SelectionLength = Len(Search)
    Else
        MsgBox("String not found.")
    End If
End Sub


Code Changes for Limiting the Number of Characters in a TextBox Control

The following code demonstrates how to use the MaxLength property to specify a maximum number of characters.

' Visual Basic 6.0
Private Sub Form_Load()
    Text1.MaxLength = 5
End Sub
Private Sub SetText()
    ' Only the first five characters will be displayed.
    Text1.Text = "Hello World"
End Sub
' Visual Basic
Private Sub Form1_Load2(ByVal sender As System.Object, ByVal e As _
System.EventArgs) Handles MyBase.Load
    TextBox1.MaxLength = 5
End Sub
Private Sub SetText()
    ' Truncate the string to equal MaxLength.
    TextBox1.Text = Strings.Left("Hello World", TextBox1.MaxLength)
End Sub


The following tables list Visual Basic 6.0 properties, methods, and events, along with their Visual Basic 2008 equivalents. Those properties, methods, and events that have the same name and behavior are not listed. All Visual Basic 2008 enumerations map to the System.Windows.Forms namespace unless otherwise noted.

This table provides links to topics explaining behavior differences. Where there is no direct equivalent in Visual Basic 2008, links are provided to topics that present alternatives.

Properties

Visual Basic 6.0

Visual Basic 2008 Equivalent

Alignment

TextAlign

Appearance

New implementation. For more information, see Appearance and BorderStyle Properties for Visual Basic 6.0 Users.

BackColor

BackColor

NoteNote:
Colors are handled differently in Visual Basic 2008. For more information, see Color Handling for Visual Basic 6.0 Users.

Container

Parent

DataChanged

DataField

DataFormat

DataMember

DataSource

New implementation. For more information, see Data Access for Visual Basic 6.0 Users.

DragIcon

DragMode

New implementation. For more information, see Drag and Drop for Visual Basic 6.0 Users.

Font

FontBold

FontItalic

FontName

FontSize

FontStrikethrough

FontUnderline

Font

NoteNote:
Fonts are handled differently in Visual Basic 2008. For more information, see Font Object for Visual Basic 6.0 Users.

ForeColor

ForeColor

NoteNote:
Colors are handled differently in Visual Basic 2008. For more information, see Color Handling for Visual Basic 6.0 Users.

Height

Height, Size

NoteNote:
Coordinates are handled differently in Visual Basic 2008. For more information, see Coordinate System for Visual Basic 6.0 Users.

HelpContextID

New implementation. For more information, see Help Support for Visual Basic 6.0 Users.

HWnd

Handle

Index

New implementation. For more information, see Control Arrays for Visual Basic 6.0 Users.

Left

Left

NoteNote:
Coordinates are handled differently in Visual Basic 2008. For more information, see Coordinate System for Visual Basic 6.0 Users.

LinkItem

LinkMode

LinkTimeOut

LinkTopic

New implementation. For more information, see Dynamic Data Exchange for Visual Basic 6.0 Users.

Locked

ReadOnly

MouseIcon

New implementation. For more information, see Cannot set a custom MousePointer.

MousePointer

Cursor

For a list of constants, see MousePointer for Visual Basic 6.0 Users.

OLEDragMode

OLEDropMode

New implementation. For more information, see Drag and Drop for Visual Basic 6.0 Users.

Parent

FindForm method.

SelLength

SelectionLength

SelStart

SelectionStart

SelText

SelectedText

ToolTipText

ToolTip component.

For more information, see ToolTip Support for Visual Basic 6.0 Users.

Top

Top

NoteNote:
Coordinates are handled differently in Visual Basic 2008. For more information, see Coordinate System for Visual Basic 6.0 Users.

WhatsThisHelpID

New implementation. For more information, see Help Support for Visual Basic 6.0 Users.

Width

Width, Size

NoteNote:
Coordinates are handled differently in Visual Basic 2008. For more information, see Coordinate System for Visual Basic 6.0 Users.

Methods

Visual Basic 6.0

Visual Basic 2008 Equivalent

Drag

New implementation. For more information, see Drag and Drop for Visual Basic 6.0 Users.

LinkExecute

LinkPoke

LinkRequest

LinkSend

New implementation. For more information, see Dynamic Data Exchange for Visual Basic 6.0 Users.

Move

SetBounds

NoteNote:
Coordinates are handled differently in Visual Basic 2008. For more information, see Coordinate System for Visual Basic 6.0 Users.

OLEDrag

New implementation. For more information, see Drag and Drop for Visual Basic 6.0 Users.

SetFocus

Focus

ShowWhatsThis

New implementation. For more information, see Help Support for Visual Basic 6.0 Users.

ZOrder

BringToFront or SendToBack function

Events

Visual Basic 6.0

Visual Basic 2008 Equivalent

Change

TextChanged

DblClick

DoubleClick

DragDrop

DragOver

New implementation. For more information, see Drag and Drop for Visual Basic 6.0 Users.

GotFocus

Enter

LinkClose

LinkError

LinkNotify

LinkOpen

New implementation. For more information, see Dynamic Data Exchange for Visual Basic 6.0 Users.

LostFocus

Leave

OLECompleteDrag

OLEDragDrop

OLEDragOver

OLEGiveFeedback

OLESetData

OLEStartDrag

New implementation. For more information, see Drag and Drop for Visual Basic 6.0 Users.

Validate

Validating

When a Visual Basic 6.0 application is upgraded to Visual Basic 2008, any TextBox controls are upgraded to Windows Forms TextBox controls, and properties, methods and events are upgraded to their equivalents. Where there may be differences in behavior, upgrade comments are inserted into the code.

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