Computer Vision image code program

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C#

Please look at this code below:

private void OnMouseMoved ( object sender, MouseEventArgs e ) {
            //throw new Exception( "The method or operation is not implemented." );
            mMouseMoveValid = true;
            mMouseX = e.X;
            mMouseY = e.Y;
            Invalidate();
        }

So, what I need to do is modify this code to show also the output value of the image... it is something like for example : (143,213)= 230 which is x = 143, y = 213 and (the image value at those coordinates is 230 pixel value which is what I need to do).

Thank you for trying