上传图片并实现缩略图

string strNewName = System.Guid.NewGuid().ToString();
    
            strNewName += this.FileUpload1.FileName.Substring(FileUpload1.FileName.LastIndexOf('.'));
            string filePath = this.FileUpload1.PostedFile.FileName;
            System.Drawing.Image oldImage, newImage;

            System.IO.Stream Filestream = FileUpload1.FileContent;

            oldImage = System.Drawing.Image.FromStream(Filestream);
            //oldImage = System.Drawing.Image.FromFile(filePath);
            System.Drawing.Image.GetThumbnailImageAbort gtia = null;
            newImage = oldImage.GetThumbnailImage(120, 120, gtia, new System.IntPtr());
            newImage.Save("C:/" + strNewName);