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EmguCV 2.3.0 in C# QueryFrame returns the previous queried frame
_capture = new Capture();
Image<Bgr, Byte> frame = _capture.QueryFrame();

Image<Gray, Byte> grayFrame = frame.Convert<Gray, Byte>();
Image<Gray, Byte> smallGrayFrame = grayFrame.PyrDown();
Image<Gray, Byte> smoothedGrayFrame = smallGrayFrame.PyrUp();
Image<Gray, Byte> cannyFrame = smoothedGrayFrame.Canny(new Gray(100), new Gray(60));

captureImageBox.Image = frame;
grayscaleImageBox.Image = grayFrame;
smoothedGrayscaleImageBox.Image = smoothedGrayFrame;
cannyImageBox.Image = cannyFrame;
_capture.Dispose();

Image<Bgr, Byte> frame;
using (Capture capture = new Capture())
{
    frame = capture1.QueryFrame().Copy(); //You must copy else frame will be disposed off
}
Image<Gray, Byte> grayFrame = frame.Convert<Gray, Byte>();
Image<Gray, Byte> smallGrayFrame = grayFrame.PyrDown();
Image<Gray, Byte> smoothedGrayFrame = smallGrayFrame.PyrUp();
Image<Gray, Byte> cannyFrame = smoothedGrayFrame.Canny(new Gray(100), new Gray(60));

grayscaleImageBox.Image = grayFrame;
smoothedGrayscaleImageBox.Image = smoothedGrayFrame;
cannyImageBox.Image = cannyFrame;

Image<Bgr, Byte> frame;
using (Capture capture1 = new Capture())
{
    frame = capture1.QueryFrame().Resize(0.5, Emgu.CV.CvEnum.INTER.CV_INTER_AREA).Copy();
    captureImageBox.Image = frame;
}

using (Image<Gray, Byte> grayFrame = frame.Convert<Gray, Byte>())
{
    grayscaleImageBox.Image = grayFrame;
    using (Image<Gray, Byte> smallGrayFrame = grayFrame.PyrDown())
    {
        using (Image<Gray, Byte> smoothedGrayFrame = smallGrayFrame.PyrUp())
        {
            smoothedGrayscaleImageBox.Image = smoothedGrayFrame;
            using (Image<Gray, Byte> cannyFrame = smoothedGrayFrame.Canny(new Gray(100), new Gray(60)))
            {
                cannyImageBox.Image = cannyFrame;
            }
        }
    }
}