怪了，找不到Response.Write了

Question

在一个方法中我这样

  try
        {
            SqlCommand cmd = new SqlCommand(sel, cn);
            SqlDataReader dr = cmd.ExecuteReader();
            dg.DataSource = dr;
            dg.DataBind();
            cn.Dispose();
        }
        catch (Exception ex)
        {
            //response.write..这里打不到Response了
            
        }
下面是引的命名空间
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

Answer 1

在什么文件中写?
HttpContext.Current.Response.Write

Answer 2

System.Web.HttpContext.Current.Response.Write