How to use right click menu item to a picture box

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C#

C#4.0

C#3.5

when I right-click on a picturebox, by using context menu items i am showing the labels like saveImageAs.
problem: when i right click on a picture box, it shows saveImageAs, when i click saveImageAs i will hit

private void saveImageAsToolStripMenuItem_Click(object sender, EventArgs e)
{
//what should i use instead of click to hit form_Mouseclick

pictureBox1.Click += form_MouseClick;
pictureBox2.Click += form_MouseClick;

}

here what should i use instead of pictureBox1.click to hit form_MouseClick

If anyone could help I would be most greatful.

private void saveImageAsToolStripMenuItem_Click(object sender, EventArgs e)
{
pictureBox1.Click += form_MouseClick;
pictureBox2.Click += form_MouseClick;

}

private void form_MouseClick(object sender, MouseEventArgs e)
{
PictureBox pb = sender as PictureBox;
SaveFileDialog sfd = new SaveFileDialog();
sfd.Filter = "Images|*.png;*.bmp;*.jpg";
if (sfd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
string filepath = System.IO.Path.GetExtension(sfd.FileName);
}
if (pb != null && sfd.FileName != null)
{
Image im = pb.Image;
SaveImage(im, sfd.FileName);
}
}

private static void SaveImage(Image im, string destPath)
{
im.Save(destPath, System.Drawing.Imaging.ImageFormat.Png);
}

What I have tried:

I tried

private void saveImageAsToolStripMenuItem_Click(object sender, EventArgs e)
{
pictureBox1.MouseClick+= form_MouseClick;
pictureBox2.MouseClick+= form_MouseClick;

}