Inhalt der Buttons in die Textbox kopieren?

Also versuche ich einen einfachen Rechner zu programmieren. Ich habe eine sehr einfache Frage. Wie kann ich den Inhalt eines Buttons in das Textfeld kopieren? zB kopiere Button1 mit dem Inhalt 1 in meine TextBox

Das ist mein Code:

$Taschenrechner = New-Object System.Windows.Forms.Form $Taschenrechner.StartPosition = "CenterScreen" $Taschenrechner.Size = New-Object System.Drawing.Size(700,600) $Taschenrechner.Text = "Taschenrechner"  #Titel $Titel = New-Object System.Windows.Forms.Label $Titel.Location = New-Object System.Drawing.Size(200,10)  $Titel.Size = New-Object System.Drawing.Size(320,50)  $Font = New-Object System.Drawing.Font("Arial",30,[System.Drawing.FontStyle]::Regular) $Titel.Font = $Font $Titel.Text = "Taschenrechner" $Titel.Name = "Taschenrechner" $Taschenrechner.Controls.Add($Titel)  #Textbox $Textfeld= New-Object System.Windows.Forms.TextBox  $Textfeld.Location = New-Object System.Drawing.Size(125,100)  $Textfeld.Size = New-Object System.Drawing.Size(100,100) $Textfeld.Width = (300)  $Taschenrechner.Controls.Add($Textfeld)  #1 $button1 = New-Object System.Windows.Forms.Button $button1.Location = New-Object System.Drawing.Size(125,120) $button1.Size = New-Object System.Drawing.Size(100,50) $button1.Text = "1" $button1.Name = "1" $Taschenrechner.Controls.Add($button1)  #2 $button2 = New-Object System.Windows.Forms.Button $button2.Location = New-Object System.Drawing.Size(225,120) $button2.Size = New-Object System.Drawing.Size(100,50) $button2.Text = "2" $button2.Name = "2" $Taschenrechner.Controls.Add($button2)  #3 $button3 = New-Object System.Windows.Forms.Button $button3.Location = New-Object System.Drawing.Size(325,120) $button3.Size = New-Object System.Drawing.Size(100,50) $button3.Text = "3" $button3.Name = "3" $Taschenrechner.Controls.Add($button3)  #4 $button4 = New-Object System.Windows.Forms.Button $button4.Location = New-Object System.Drawing.Size(125,170) $button4.Size = New-Object System.Drawing.Size(100,50) $button4.Text = "4" $button4.Name = "4" $Taschenrechner.Controls.Add($button4)  #5 $button5 = New-Object System.Windows.Forms.Button $button5.Location = New-Object System.Drawing.Size(225,170) $button5.Size = New-Object System.Drawing.Size(100,50) $button5.Text = "5" $button5.Name = "5" $Taschenrechner.Controls.Add($button5)  #6 $button6 = New-Object System.Windows.Forms.Button $button6.Location = New-Object System.Drawing.Size(325,170) $button6.Size = New-Object System.Drawing.Size(100,50) $button6.Text = "6" $button6.Name = "6" $Taschenrechner.Controls.Add($button6)  #7 $button7 = New-Object System.Windows.Forms.Button $button7.Location = New-Object System.Drawing.Size(125,220) $button7.Size = New-Object System.Drawing.Size(100,50) $button7.Text = "7" $button7.Name = "7" $Taschenrechner.Controls.Add($button7)  #8 $button8 = New-Object System.Windows.Forms.Button $button8.Location = New-Object System.Drawing.Size(225,220) $button8.Size = New-Object System.Drawing.Size(100,50) $button8.Text = "8" $button8.Name = "8" $Taschenrechner.Controls.Add($button8)  #9 $button9 = New-Object System.Windows.Forms.Button $button9.Location = New-Object System.Drawing.Size(325,220) $button9.Size = New-Object System.Drawing.Size(100,50) $button9.Text = "9" $button9.Name = "9" $Taschenrechner.Controls.Add($button9)  #0 $button0 = New-Object System.Windows.Forms.Button $button0.Location = New-Object System.Drawing.Size(125,270) $button0.Size = New-Object System.Drawing.Size(100,50) $button0.Text = "0" $button0.Name = "0" $Taschenrechner.Controls.Add($button0)   [void] $Taschenrechner.ShowDialog()