Stick this in a win forms app to make it drag-able

Drag a winform

$global:dragging = $false
$global:mouseDragX = 0
$global:mouseDragY = 0

$form1.Add_MouseDown( { $global:dragging = $true
                            $global:mouseDragX = [System.Windows.Forms.Cursor]::Position.X - $form1.Left
                            $global:mouseDragY = [System.Windows.Forms.Cursor]::Position.Y -$form1.Top
                        })

$form1.Add_MouseMove( { if($global:dragging) {
                                $screen = [System.Windows.Forms.Screen]::PrimaryScreen.WorkingArea
                                $currentX = [System.Windows.Forms.Cursor]::Position.X
                                $currentY = [System.Windows.Forms.Cursor]::Position.Y
                                [int]$newX = [Math]::Min($currentX - $global:mouseDragX, $screen.Right - $form1.Width)
                                [int]$newY = [Math]::Min($currentY - $global:mouseDragY, $screen.Bottom - $form1.Height)
                                $form1.Location = New-Object System.Drawing.Point($newX, $newY)
                            }})

$form1.Add_MouseUp( { $global:dragging = $false })