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private void AddTextToImg(string fileName,string text)
        ...{
            if(!File.Exists(MapPath(fileName)))
            ...{
                throw new FileNotFoundException("The file don't exist!");
            }
            
            if( text == string.Empty )
            ...{
                return;
            }
            //

            System.Drawing.Image image = System.Drawing.Image.FromFile(MapPath(fileName));
            Bitmap bitmap = new Bitmap(image,image.Width,image.Height);
            Graphics g = Graphics.FromImage(bitmap);

            float fontSize = 12.0f;             //
            float textWidth = text.Length*fontSize;  //
            //
            float rectX = 0;        
            float rectY = 0;
            float rectWidth = text.Length*(fontSize+8);
            float rectHeight = fontSize+8;
            //
            RectangleF textArea = new RectangleF(rectX,rectY,rectWidth,rectHeight);

            Font font = new Font("宋體",fontSize);   //
            Brush whiteBrush = new SolidBrush(Color.White);   //
            Brush blackBrush = new SolidBrush(Color.Black);   //

            g.FillRectangle(blackBrush,rectX,rectY,rectWidth,rectHeight);            

            g.DrawString(text,font,whiteBrush,textArea);
            MemoryStream ms = new MemoryStream( );
            
            
//            bitmap.Save(ms,ImageFormat.Jpeg);            
//
//            
//            //Response.Clear();
//            Response.ContentType = "image/jpeg";
//            Response.BinaryWrite( ms.ToArray() );

            string FILE_NAME = @"D:StudySampleCSharpAddTextToPicSunttt.jpg";
            bitmap.Save(FILE_NAME,ImageFormat.Jpeg);
            Image1.ImageUrl = FILE_NAME;

            g.Dispose();
            bitmap.Dispose();
            image.Dispose();
        }

        private void Button1_Click(object sender, System.EventArgs e)
        ...{
            AddTextToImg("Sunset.jpg","XiaoA");
        }

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