怎样Response.Write输出script 显示变量值?小问题

Question

            string yazhu,Zongshu, SqlStrings;            SqlConnection con = new SqlConnection("server=127.0.0.1;database=Toupiao;uid=sa;pwd=sa");
            con.Open();
            SqlDataAdapter sd = new SqlDataAdapter("select  * from Usermain where Username='" + username + "' ", con);
            DataSet ds = new DataSet();
            sd.Fill(ds);
          Zongshu = ds.Tables[0].Rows[0]["Gold"].ToString();
         yazhu = TextBox1.Text.ToString();         if (int.Parse(Zongshu) < int.Parse(yazhu))
         {
             Response.Write("<script>alert('Gold不够')</script>");
         }
                      else
         {
             int Zuihou = int.Parse(Zongshu) - int.Parse(yazhu);
             SqlStrings = "update Usermain set Gold = '" + Zuihou + "' where Username = '" + username + "'";
             SqlCommand cmd = new SqlCommand(SqlStrings, con);
             cmd.ExecuteNonQuery();
             Response.Write("<script>alert('我要在这调用"yazhu"这个变量的值应该怎样写?')</script>");
         }

Answer 1

          Response.Write(" <script>alert('"+yazhu.toString()+"') </script>"); 

Answer 2

最不影响页面的外观的写法应该是:
Page.ClientScript.RegisterStartupScript(Page.GetType(), "", "<script language=javascript>alert('"+yazhu.toString()+"') </script>");