In this article we will discuss about how to create a text file in C#.Net using System.IO namespace as well as how we can read from the text file in C#.Net. You can check my previous article on how to get
driver info in C#.Net, how to
add users to group in active directory in C#.Net, as well as you can check some
SQL Server articles.
C#.Net provides system.IO namespace to work with files and directory. Here we will check how we can read and write to text file using Streams.
We can Write to a file and Read from a file using StreamWriter and StreamReader.
Below is the full code:
HTML Code:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ReadAndWriteTextFile.aspx.cs"
Inherits="ReadAndWriteTextFile" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Read and Write text file in Asp.Net</title>
</head>
<body>
<form id="form1" runat="server">
<div>
Create Text File:
<asp:Button ID="btnCreateTextFile" runat="server" Text="Create Text File"
onclick="btnCreateTextFile_Click" /><br />
Read From Text File: <asp:Button ID="btnReadFromTextFile"
runat="server" Text="Read from Text File" onclick="btnReadFromTextFile_Click" />
<br />
<asp:Label ID="lblReadFile" runat="server" Text=""></asp:Label>
</div>
</form>
</body>
</html>
.cs Code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Text;
public partial class ReadAndWriteTextFile : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnCreateTextFile_Click(object sender, EventArgs e)
{
CreateTextFile();
}
protected void btnReadFromTextFile_Click(object sender, EventArgs e)
{
ReadFromTextFile();
}
void CreateTextFile()
{
try
{
StreamWriter sw;
sw = File.CreateText(@"c:\myTestfile.txt");
sw.WriteLine("We have successfully created a text file in C drive !!!");
sw.WriteLine("Thanks to SharePointDotNet.com !!!");
sw.Close();
}
catch (Exception ex)
{
//Hande the exception here !
}
}
If you will check C drive then you will get the text file as shown in the figure below:
void ReadFromTextFile()
{
try
{
FileStream fs = File.Open(@"c:\myTestfile.txt", FileMode.Open, FileAccess.Read, FileShare.Read);
StreamReader sr = new StreamReader(fs);
StringBuilder sb = new StringBuilder();
sb.Append(sr.ReadToEnd());
lblReadFile.Text = sb.ToString();
}
catch (Exception ex)
{
//Hande the exception here !
}
}
}
Once you will click on Read From Text file button, you will be able to see like below:
