I want to upload photo and signature in my project

 // This code download an image attachment from server...
 protected void lnkAttachment_Click(object sender, EventArgs e)
        {

            LinkButton lnkAttachment = (LinkButton)sender;
            GridViewRow row = (GridViewRow)lnkAttachment.NamingContainer;
            var fileName = ((LinkButton)row.FindControl("lnkAttachment")).Text;
            string sourcePath = Server.MapPath("~/Attachment/Contract/");
            string sourceFle = (Server.MapPath("~/Attachment/Contract/" + fileName.ToString()));
            string targetPath = this.txtTargetDir.Text;
            string targetFle = targetPath + "\\" + fileName;
            string result = string.Empty;
            this.txtAttachment.Value = string.Empty;
            if (!Directory.Exists(targetPath))
            {
               var ok = System.IO.Directory.CreateDirectory(targetPath);
            }
            if (!File.Exists(sourceFle ))
            {
                Tools.MessageBox.Show(this.Page, "Could not foud\\n" + sourceFle);
                string uploadedFile = sourceFle;
                string resultMes = cCmd.DeleteUploadFileName(uploadedFile);
                List<contract_attachmnt> lst = new List<contract_attachmnt>();
                lst = cCmd.GetAttachment(this.hfContracNo.Value);
                BindAttachment(lst);
                return;
            }
            try
            {
                Response.ContentType = "application/ms-excel";
                var attachmentFle = "attachment; filename=" + fileName;
                Response.AppendHeader("Content-Disposition",attachmentFle);
                var xx = Path.GetTempPath();
                Response.TransmitFile(sourceFle);
                Response.End();
            }
            catch (Exception)
            {
                result = "Error in downloading file.";
            }
            Tools.MessageBox.Show(this.Page, result);
        }
</contract_attachmnt></contract_attachmnt>