ต้องการทำลายน้ำบนรูปภาพที่ user upload ขึ้นไป ทำได้หรือไม่ครับ

using System;
using System.Drawing;
using System.Drawing.Drawing2D;


public class Watermark
{
    
    //this fuction takes an Image and String for watermarking as argument
    //and returns an Image with watermark

    public Bitmap WaterMarkToImage(string ImagePath,string watermark)
    {
        Bitmap bmp;
        bmp = new Bitmap(ImagePath);

        Graphics graphicsObject;
        int x, y;
        try
        {
            //create graphics object from bitmap
            graphicsObject = Graphics.FromImage(bmp);
        }
        catch (Exception e)
        {

            Bitmap bmpNew = new Bitmap(bmp.Width, bmp.Height);
            graphicsObject = Graphics.FromImage(bmpNew);

            graphicsObject.DrawImage(bmp, new Rectangle(0, 0, bmpNew.Width, bmpNew.Height), 0, 0, bmp.Width, bmp.Height, GraphicsUnit.Pixel);

            bmp = bmpNew;
        }

        int startsize = (bmp.Width / watermark.Length);//get the font size with respect to length of the string

        //x and y cordinates to draw a string
        x = 0;
        y = bmp.Height / 2;

        //System.Drawing.StringFormat drawFormat = new System.Drawing.StringFormat(StringFormatFlags.DirectionVertical); -> draws a vertical string for watermark
        System.Drawing.StringFormat drawFormat = new System.Drawing.StringFormat(StringFormatFlags.NoWrap);
        
        //drawing string on Image
        graphicsObject.DrawString(watermark, new Font("Verdana", startsize, FontStyle.Bold), new SolidBrush(Color.FromArgb(60, 255, 255, 255)), x, y, drawFormat);

        //return a water marked image
        return (bmp);
    }  

}