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
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.SuspendLayout()
        '
        'TextBox1
        '
        Me.TextBox1.Font = New System.Drawing.Font("Tahoma", 10.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.TextBox1.Location = New System.Drawing.Point(8, 8)
        Me.TextBox1.Multiline = True
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(440, 416)
        Me.TextBox1.TabIndex = 0
        Me.TextBox1.Text = ""
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(458, 431)
        Me.Controls.Add(Me.TextBox1)
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog
        Me.MaximizeBox = False
        Me.Name = "Form1"
        Me.Text = "  Triangles"
        Me.ResumeLayout(False)

    End Sub
#End Region


    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load, TextBox1.DoubleClick

        Dim i, j As Integer
        Dim s = "  ", x As String
        Me.TextBox1.Text = ""
        Me.TextBox1.ScrollBars = ScrollBars.Both
        x = InputBox(" How many lines?", " Question", "7", )
        If Not IsNumeric(x) Then x = 7

        For i = 1 To x
            For j = 1 To i
                Me.TextBox1.AppendText("*")
            Next
            Me.TextBox1.AppendText(vbNewLine)
        Next

        Me.TextBox1.AppendText(vbNewLine)

        For i = x To 1 Step -1
            For j = i To 1 Step -1
                Me.TextBox1.AppendText("*")
            Next
            Me.TextBox1.AppendText(vbNewLine)
        Next

        Me.TextBox1.AppendText(vbNewLine)

        For i = (x * 2 + 1) To 1 Step -2
            For j = 1 To i
                If j Mod 2 = 0 Then
                    Me.TextBox1.AppendText("o")
                Else
                    Me.TextBox1.AppendText("*")
                End If

            Next
            Me.TextBox1.AppendText(vbNewLine)
            Me.TextBox1.AppendText(s)
            s = s + "  "
        Next

    End Sub
End Class