How do i check if image in PictureBox is changed ? And add that image in a datagridview -

How do i check if image in PictureBox is changed ? And add that image in a datagridview -

im trying add together image img dtgv gives me error "this image not exist in courent context"

dgv private double shtonegrid(string targa, string ora, double pagesa,image img) { img = picturebox2.image; double result = 0; targa = klienttxt.text.tostring(); ora = oralbl.text; datagridview1.rows.add(targa, ora, pagesa); homecoming result; }

but when phone call it,it tells me name "img" not exist in current context.

datagridview picturebox