Imports System.IO
Public Class Form1
    Inherits System.Windows.Forms.Form

#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.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.
    Friend WithEvents Button1 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Button1 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(48, 32)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(120, 40)
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "Replace Text in word document"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(224, 101)
        Me.Controls.Add(Me.Button1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

#End Region
    'declare variable of word application
    Dim WordApp As New Word.Application
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        'declaring a document as word document
        Dim thisDoc As Word.Document
        'declaring range variable as word range variable.
        Dim thisRange As Word.Range

        'open the file from curent directory the file called 
        'test.doc
        WordApp.Documents.Open(Directory.GetCurrentDirectory & "\test.doc")
        'make the word app visible to false
        WordApp.Visible = False
        'make the document active document
        thisDoc = WordApp.ActiveDocument
        'replacing the word VB7 to VB.Net
        thisDoc.Content.Find.Execute(FindText:="VB7", _
                   ReplaceWith:="VB.NET", _
                   Replace:=Word.WdReplace.wdReplaceAll)
        'replace 3 space character with 2 in rest of the document.   
        While thisDoc.Content.Find.Execute(FindText:="  ", _
                           Wrap:=Word.WdFindWrap.wdFindContinue)
            thisDoc.Content.Find.Execute(FindText:="  ", _
                           ReplaceWith:=" ", _
                           Replace:=Word.WdReplace.wdReplaceAll, _
                           Wrap:=Word.WdFindWrap.wdFindContinue)
        End While
        'saving document
        WordApp.Documents.Item(1).Save()
        'show message box
        MsgBox("Replaced all instances of 'VB7' with 'VB.NET' and saved the document")
        'close word
        WordApp.Documents.Item(1).Close()
    End Sub
End Class
