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{

#region Import the Assemblies
[reflection.assembly]::loadwithpartialname("System.Windows.Forms") | Out-Null  
[reflection.assembly]::loadwithpartialname("System.Drawing") | Out-Null  
#endregion

#region Generated Form Objects
$form1 = New-Object System.Windows.Forms.Form
$button1 = New-Object System.Windows.Forms.Button
$progress = New-Object System.Windows.Forms.ProgressBar
$InitialFormWindowState = New-Object System.Windows.Forms.FormWindowState
$timer = New-Object System.Windows.Forms.Timer
#endregion Generated Form Objects


$global:job = $null
$global:currentcnt = 0
$global:totalcnt = 0

$handler_button1_Click= {
    if ($button1.Text -eq "Start"){  
        $timer.Start()
        $button1.Text = "Running"  
        $button1.Enabled = $false
        $progress.Value = 0

        $global:currentcnt = 0
        # Anzahl der Dateien ermitteln
        $global:totalcnt = (robocopy "C:\quelle" "C:\ziel" /S /ZB /ETA /L /NS /NC /NJH /NJS /NDL ).length -1  

        $i = 0
        $global:job = Start-Job -ScriptBlock {
            robocopy "C:\quelle" "C:\ziel" /S /ZB /ETA /NS /NC /NJH /NJS /NDL /NP /R:10 /W:10  
        }
    }else{
        $timer.Stop()
        $global:job | stop-job
        $global:job | remove-job -Force
        $button1.Text = "Start"  
    }

}
$handler_tick = {
    $global:currentcnt += ($global:job | Receive-Job).Count
    $percent = ($global:currentcnt / $global:totalcnt) * 100

    if ($percent -lt 100) {
        $progress.Value = $percent
    }else{
        $progress.Value = 100
        $timer.Enabled = $false
        $button1.Enabled = $true
        $button1.Text = "Start"  
       $global:job | remove-job -ErrorAction SilentlyContinue
    }
}

$OnLoadForm_StateCorrection=
{#Correct the initial state of the form to prevent the .Net maximized form issue
	$form1.WindowState = $InitialFormWindowState
}

#----------------------------------------------
#region Generated Form Code
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Height = 74
$System_Drawing_Size.Width = 292
$form1.ClientSize = $System_Drawing_Size
$form1.DataBindings.DefaultDataSourceUpdateMode = 0
$form1.MaximizeBox = $False
$form1.Name = "form1"  
$form1.Text = "ProgressForm"  


$button1.DataBindings.DefaultDataSourceUpdateMode = 0

$System_Drawing_Point = New-Object System.Drawing.Point
$System_Drawing_Point.X = 12
$System_Drawing_Point.Y = 41
$button1.Location = $System_Drawing_Point
$button1.Name = "button1"  
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Height = 23
$System_Drawing_Size.Width = 268
$button1.Size = $System_Drawing_Size
$button1.TabIndex = 1
$button1.Text = "Start"  
$button1.UseVisualStyleBackColor = $True
$button1.add_Click($handler_button1_Click)

$form1.Controls.Add($button1)

$progress.DataBindings.DefaultDataSourceUpdateMode = 0
$System_Drawing_Point = New-Object System.Drawing.Point
$System_Drawing_Point.X = 12
$System_Drawing_Point.Y = 12
$progress.Location = $System_Drawing_Point
$progress.Name = "progress"  
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Height = 23
$System_Drawing_Size.Width = 268
$progress.Size = $System_Drawing_Size
$progress.TabIndex = 0

$form1.Controls.Add($progress)

#Save the initial state of the form
$InitialFormWindowState = $form1.WindowState
#Init the OnLoad event to correct the initial state of the form
$form1.add_Load($OnLoadForm_StateCorrection)

#Timer settings
$timer.add_tick($handler_tick)
$timer.Enabled = $false
$timer.Interval = 500

#----- Show Form
$form1.ShowDialog() | out-null

# WICHTIG Timer resourcen freigeben 
$timer.dispose()