default.aspx.cs

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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)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string path = FileUpload1.PostedFile.FileName.ToString();
        ReadText(path);

    }
    public void ReadText(string path)
    {
        StreamReader sr = File.OpenText(path);
        StringBuilder outtext = new StringBuilder();
        string rl;
        while ((rl = sr.ReadLine()) != null)
        {
            outtext.Append(rl + "<br>");
        }
        sr.Close();
        Label1.Text = outtext.ToString();
    }
}