Notepad is a basic text editor that you can use to create simple documents. The most common use for Notepad is to view or edit text (.txt) files. This is a simple notepad clone written using the visual basic programming language. This can be useful for new or advance programmers who want to create a custom notepad.

Code:

Public Class mainFrm
    Inherits System.Windows.Forms.Form
    Dim txtChanged As Boolean
    Dim theStr As String
    
     Private Sub txtPad_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtPad.TextChanged
        txtChanged = True
        linePanel.Text = "Ln: " & txtPad.Lines.Length
        colPanel.Text = "Chr: " & txtPad.SelectionStart
    End Sub

    Private Sub mnuNew_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuNew.Click
        Dim msg As String
        If txtChanged = True Then
            msg = MsgBox("Do you want to save your current changes?", MsgBoxStyle.YesNo, " Save Changes?")
        End If

        If msg = vbYes Then
            Dim a As EventArgs
            mnuSave_Click(0, a)
            txtChanged = False
        Else
            txtRich.Clear()
            txtChanged = False
        End If
    End Sub

    Private Sub mnuPageSetup_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuPageSetup.Click
        Dim dlgPageSetup As New PageSetupDialog()
    End Sub

    Private Sub mnuExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuExit.Click
        Close()
    End Sub

    Private Sub mnuPrint_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuPrint.Click
        Dim dlgPrint As New PrintDialog()
    End Sub

    Private Sub mnuOpen_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuOpen.Click
        Dim openDlg As New OpenFileDialog()
        Dim buff As String
        openDlg.Filter = "Text Files (*.txt)|*.txt"
        openDlg.ShowDialog()
        FileOpen(1, openDlg.FileName, OpenMode.Input)
        While Not EOF(1)
            Input(1, buff)
            txtRich.AppendText(buff)
        End While
        FileClose(1)
    End Sub

    Private Sub mnuSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuSave.Click
        Dim saveDlg As New SaveFileDialog()
        Dim buff As String
        Static theFile As String
        If System.IO.File.Exists(theFile) = False Then
            saveDlg.Filter = "Text Files (*.txt)|*.txt"
            saveDlg.ShowDialog()
            If saveDlg.CheckFileExists = False Then Exit Sub
            theFile = saveDlg.FileName
            FileOpen(1, theFile, OpenMode.Output)
            buff = txtRich.Text
            Print(1, buff)
            FileClose(1)
            txtChanged = False
        Else
            FileOpen(1, theFile, OpenMode.Output)
            buff = txtPad.Text
            Print(1, buff)
            FileClose(1)
            txtChanged = False
        End If
    End Sub

    Private Sub mnuSaveAs_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuSaveAs.Click
        Dim saveDlg As New SaveFileDialog()
        Dim theFile As String
        Dim buff As String
        saveDlg.Filter = "Text Files (*.txt)|*.txt"
        saveDlg.ShowDialog()
        If saveDlg.CheckFileExists = False Then Exit Sub
        theFile = saveDlg.FileName
        FileOpen(1, theFile, OpenMode.Output)
        buff = txtRich.Text
        Print(1, buff)
        FileClose(1)
        txtChanged = False
    End Sub

    Private Sub mnuUndo_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuUndo.Click
        txtRich.Undo()
    End Sub

    Private Sub mnuTimeDate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuTimeDate.Click
        Dim theDate As Date
        txtRich.AppendText(TimeOfDay & " " & Today)

    End Sub

    Private Sub mnuSelectAll_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuSelectAll.Click
        txtRich.SelectAll()
    End Sub

    Private Sub mnuDel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuDel.Click
        txtRich.SelectedText = ""
    End Sub

    Private Sub mnuFind_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuFind.Click
        theStr = InputBox("What do word do you want to search for?", " Find")
        txtRich.Find(theStr)
    End Sub

    Private Sub mnuGoto_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuGoto.Click
        Dim lineNum As Integer
        Dim txtLineCount As Integer
        txtLineCount = txtPad.Lines.Length
        txtLineCount = CStr(txtLineCount)
        lineNum = InputBox("Please enter the line number you want to goto.", " Goto Line Number", txtLineCount)
        If lineNum > txtLineCount Then MsgBox("Line number is out of range!", MsgBoxStyle.Exclamation, " Out of range") : Exit Sub
        lineNum = CInt(lineNum)
    End Sub

    Private Sub mnuCut_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuCut.Click
        txtPad.Cut()
    End Sub

    Private Sub mnuCopy_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuCopy.Click
        txtRich.Copy()
    End Sub

    Private Sub mnuPaste_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuPaste.Click
        txtRich.Paste()
    End Sub

    Private Sub mnuWordwrap_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuWordwrap.Click
        If mnuWordwrap.Checked = True Then
            mnuWordwrap.Checked = False
            txtRich.WordWrap = False
        Else
            mnuWordwrap.Checked = True
            txtRich.WordWrap = True
        End If
    End Sub

    Private Sub mnuFont_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuFont.Click
        Dim fontDlg As New FontDialog()
        fontDlg.ShowDialog()
        txtRich.Font = fontDlg.Font
    End Sub


    Private Sub mnuStatusbar_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuStatusbar.Click
        If mnuStatusbar.Checked = True Then
            StatusBar1.Hide()
            mnuStatusbar.Checked = False
        Else
            mnuStatusbar.Checked = True
            StatusBar1.Show()
        End If
    End Sub

    Private Sub mnuFindnext_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuFindnext.Click
        Dim startStr As Integer
        startStr = txtRich.SelectionStart
        txtRich.Find(theStr, startStr, RichTextBoxFinds.WholeWord)
    End Sub

    Private Sub mnuReplace_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuReplace.Click
        Dim strReplace As String
        Dim strNew As String
        If theStr = "" Then
            theStr = InputBox("What word do you want to search for?", " Find")
            If theStr = "" Then Exit Sub
        End If
        strNew = InputBox("What you do want to replace: " & theStr & " : with?", " Replace")
        txtPad.SelectedText = strNew
    End Sub

    Private Sub txtRich_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtRich.TextChanged
        txtChanged = True
        linePanel.Text = "Ln: " & txtRich.Lines.Length
        colPanel.Text = "Chr: " & txtRich.SelectionStart
    End Sub

    Private Sub MenuItem1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem1.Click
        txtRich.Redo()
    End Sub
End Class