Loop

Can anyone tell me how to write the code for this one. this one use for or Do While loop. It will only use Command button and the loop will be printed in the form itself ones the Command button was pressed. No Textbox or other toolbox menu needed. This loop is in the form of Pyramid not a right triangle.
1
123
12345
1234567
123456789

Thanks for the kindness people. jerald-12 from the Philippines

That one is in the form of PYRAMID not right triangle. Thanks.

Getting the shape of a pyramid is going to be a bit tough, as the size of the characters is different for different characters in most fonts. Using a font with equal size per character would make it easier.

How do you intend to display this, and how many rows? There has to be some control that the string of numbers is displayed on, such as a series of labels, or a listbox, or some such.

heres an example i wrote:

vb Code:

Public Class Form1
 
    Dim sb As New System.Text.StringBuilder
    Dim newFont As New Font("MS Sans Serif", 10)
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim rangeStart As Integer = 1
        Dim rangeEnd As Integer = 1
        Dim lines(4) As String
 
        For y As Integer = 1 To 5
            For x As Integer = -9 To -2
                If x >= rangeStart Then
                    lines(y - 1) &= Math.Abs(x).ToString
                End If
            Next
            For x As Integer = 1 To 9
                If x <= rangeEnd Then
                    lines(y - 1) &= x.ToString
                End If
            Next
            If y > 1 Then rangeStart -= 2 Else rangeStart -= 4
            rangeEnd += 2
        Next
 
        Dim newLines As New List(Of String)
 
        For y As Integer = 5 To 1 Step -1
            If y = 5 Then
                newLines.Add(String.Format("{0,-1}{1}", "", lines(y - 1)))
            Else
                newLines.Add(String.Format("{0," & -((Math.Abs(y - 5) * 4) + 1) & "}{1}", "", lines(y - 1)))
            End If
        Next
 
        newLines.Reverse()
 
        sb.Append(String.Join(Environment.NewLine, newLines.ToArray))
 
        Dim gr As Graphics = Graphics.FromHwnd(Me.Handle)
        Dim maxWidth As Integer = CInt(gr.MeasureString(newLines(newLines.Count - 1), newFont).Width)
        Dim maxHeight As Integer = CInt(gr.MeasureString(newLines(newLines.Count - 1), newFont).Height) * 5
 
        Me.SetClientSizeCore(maxWidth + 100, maxHeight + 100)
 
        Me.Invalidate()
 
    End Sub
 
    Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
        e.Graphics.DrawString(sb.ToString, newFont, Brushes.Black, New Point(50, 50))
    End Sub
 
End Class