I had made a example for test with two buttons:

Button1 => capture screen and save it to a MemoryStream

Buton2 => Shows "Form2" maximized already with the image captured defined on a PictureBox present on other Form.

And it works very fine!

The trouble now is that, I'm trying make it in my Remote Administration Tool and when I go show the "Form2" he crashes, and after stop work.

Here is my code until now:

Case "Lock" 'first capture screen

                    img = cap.TakeScreenShot 'captures screen
                    memory = New MemoryStream
                    img.Save(memory, System.Drawing.Imaging.ImageFormat.Jpeg) 'save it to memory

                Case "Jump" 'after show this captures on another Form

                    Dim tr As New Thread(Sub()

                                             locker.Screenshot.Image = Image.FromStream(memory)
                                             locker.Screenshot.Image = cap.ChangeOpacity(Image.FromStream(memory), 0.3)
                                             locker.Show()  'rises other Form (mamimized) already with screen captured into PictureBox
                                             memory.Dispose() 'release MemoryStream
                                             img.Dispose()    'release Bitmap
                                             locker.Screenshot.Dispose() 'release PicturBox on other Form

                                         End Sub)
And here is my example that works very fine:

    Dim img As Image
    Dim memory As MemoryStream

    Public Function TakeScreenShot() As Bitmap

        Dim screenSize As Size = New Size(My.Computer.Screen.Bounds.Width, My.Computer.Screen.Bounds.Height)

        Dim screenGrab As New Bitmap(My.Computer.Screen.Bounds.Width, My.Computer.Screen.Bounds.Height)

        Dim g As Graphics = Graphics.FromImage(screenGrab)

        g.CopyFromScreen(New Point(0, 0), New Point(0, 0), screenSize)

        Return screenGrab

    End Function

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        img = TakeScreenShot()
        memory = New MemoryStream
        img.Save(memory, System.Drawing.Imaging.ImageFormat.Gif)
    End Sub

    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        Form2.PictureBox1.Image = Image.FromStream(memory)
    End Sub
So, someone can helpe me to solve it please?

Any suggestion will welcome.

Thanks in advance.