asp.net 按行读取包含中文的文本(txt)文件并取得行数

using System;
using System.Data;
using System.Configuration;
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.IO;
using System.Text;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
string Path = Server.MapPath("4.txt");
insertStr(Path);
}
}

public void insertStr(string Path)
{
string strLine = "";
int i = 0;
try
{
StreamReader sr = new StreamReader(Path, Encoding.GetEncoding("GB2312"));

strLine = sr.ReadLine();

while (strLine != null)
{
Response.Write(strLine + "<br>");
strLine = sr.ReadLine();
i++;
}
Response.Write(i);
sr.Dispose();
sr.Close();
}
catch
{
}

}

}