how to create for simple photo capture camera using emgu cv C#

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C#

Emgu-CV

I an new in emgu cv c#. I want to create a camera only for simple photocapture from my laptop camera and other camera device connected to my laptop.I dont want video capture only simple photo capture.with one start and one capture button.and will save in particular location.please help me.

public cameracaps()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        try
        {

            Capture cam = new Capture();

        }
        catch (NullReferenceException exception)
        {
            MessageBox.Show(exception.Message);
            return;
        }
        Application.Idle += new EventHandler(processFunction);
        capturingprocess=true;

    }
    void processFunction(object sender,EventArgs e)
    {
       imgOrg=capturecam.QueryFrame();
        if(imgOrg ==null)return;
        imgproc=imgOrg.InRange(new Bgr(50,50,50),new Bgr(250,250,250));
        imgproc = imgproc.SmoothGaussian(9);
        original.Image=imgOrg;
        processed.Image=imgproc;
    }


    private void Button1_Click(object sender, EventArgs e)
    {
        if(capturingprocess==true)
        {
            Application.Idle-=processFunction;
            capturingprocess = false;
            Button1.Text="play";
        }
        else
        {
            Application.Idle+= processFunction;
            capturingprocess= true;
            Button1.Text="pause";


    }


}

showing..The type initializer for 'Emgu.CV.CvInvoke' threw an exception. error..indicating error in Capture cam = new Capture(); help me.