图片上传

string fullFileName = this.FileUpload1.PostedFile.FileName;         //全路径 
        string fileName = fullFileName.Substring(fullFileName.LastIndexOf("\\") + 1);  // 这是\ 后面的名字
        string type = fullFileName.Substring(fullFileName.LastIndexOf(".") + 1);  //这是.后面的名字 记得要加1
        
        if (type == "jpg" || type == "bmp" || type == "gif")
        {
            this.FileUpload1.PostedFile.SaveAs(Server.MapPath("up") + "\\" + fileName);    //保存的地方  UP为就文件区
            this.Image1.ImageUrl = "../up/" + fileName;          //控件IMAGE 可以看到上传的照片
            Label1.Text = "../up/" +fileName;
           

            Response.Write("<script language='javascript'>alert('上传成功');</script>");
        }
        else
        {
            Response.Write("<script language='javascript'>alert('你上传的格式不对！请重新上传！');</script>");
        }