مقدار پارامتر رو چی بدم؟

سلام در کد زیر مقدار ورودی memory stream ms و MemoryStream outputStream باید چی بدم؟ ممنون میشم راهنمایی کنید

 public  void AddWaterMark(MemoryStream ms, string watermarkText, MemoryStream outputStream)

        {

            System.Drawing.Image img = System.Drawing.Image.FromStream(ms);

            Graphics gr = Graphics.FromImage(img);

            Font font = new Font("Tahoma", (float)40);

            Color color = Color.FromArgb(50, 241, 235, 105);

            double tangent = (double)img.Height / (double)img.Width;

            double angle = Math.Atan(tangent) * (180 / Math.PI);

            double halfHypotenuse = Math.Sqrt((img.Height * img.Height) + (img.Width * img.Width)) / 2;

            double sin, cos, opp1, adj1, opp2, adj2;



            for (int i = 100; i > 0; i--)

            {

                font = new Font("Tahoma", i, FontStyle.Bold);

                SizeF sizef = gr.MeasureString(watermarkText, font, int.MaxValue);



                sin = Math.Sin(angle * (Math.PI / 180));

                cos = Math.Cos(angle * (Math.PI / 180));

                opp1 = sin * sizef.Width;

                adj1 = cos * sizef.Height;

                opp2 = sin * sizef.Height;

                adj2 = cos * sizef.Width;



                if (opp1 + adj1 < img.Height && opp2 + adj2 < img.Width)

                    break;

                //

            }



            StringFormat stringFormat = new StringFormat();

            stringFormat.Alignment = StringAlignment.Center;

            stringFormat.LineAlignment = StringAlignment.Center;



            gr.SmoothingMode = SmoothingMode.AntiAlias;

            gr.RotateTransform((float)angle);

            gr.DrawString(watermarkText, font, new SolidBrush(color), new Point((int)halfHypotenuse, 0), stringFormat);



            img.Save(outputStream, ImageFormat.Jpeg);

        }

    }