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string str1 = Server.MapPath(mapho);//ÒªÌí¼ÓˮӡµÄͼƬ
string str2 = Server.MapPath("WaterMark.jpg");//Ìí¼ÓµÄÄÚÈÝͼƬ
System.Drawing.Image bmp = System.Drawing.Image.fromFile(str1);
Graphics gs = Graphics.fromImage(bmp);
System.Drawing.Image bmp2 = System.Drawing.Image.fromFile(str2);
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gs.DrawImage(bmp2, bmp.Width-bmp2.Width, bmp.Height - bmp2.Height, bmp2.Width, bmp2.Height);
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bmp.Save(Response.OutputStream,ImageFormat.Jpeg);//±£´æ
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using System.Security.Cryptography;
using System.IO;
using System.text;
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protected void Page_Load(object sender, EventArgs e)
{
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