Write data from Textbox into text file in ASP.net with C#

Question

I have a textbox where a user can input their email, what I want to do is make it so that when they click a submit button. That email will be saved into a text file ( on my server ) called emails.txt

I managed to get this working using System.IO and then using the File.WriteAll method. However I want to make it so that it will add the email to the list ( on a new line ) rather then just overwriting whats already in there.

I've seen people mention using Append, but I can't quite grasp how to get it working.

This is my current code (that overwrites instead of appending).

public partial class _Default : Page
{
    private string path = null;

    protected void Page_Load(object sender, EventArgs e)
    {
        path = Server.MapPath("~/emails.txt");
    }

    protected void emailButton_Click(object sender, EventArgs e)
    {
        File.WriteAllText(path, emailTextBox.Text.Trim());
        confirmEmailLabel.Text = "Thank you for subscribing";
    }
}

Akash KC · Accepted Answer · 2012-09-16 06:35:26Z

7

You can use StreamWriter to get working with text file. The WriteLine method in true mode append your email in new line each time....

using (StreamWriter writer = new StreamWriter("email.txt", true)) //// true to append data to the file
{
    writer.WriteLine("your_data"); 
}

edited Sep 16, 2012 at 6:35

answered Sep 16, 2012 at 6:27

Akash KC

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Comments

Iridio · Accepted Answer · 2012-09-16 06:25:26Z

1

From the official MSDN documentation:

using (StreamWriter w = File.AppendText("log.txt"))
{
   MyWriteFunction("Test1", w);
   MyWriteFunction("Test2", w);
}

answered Sep 16, 2012 at 6:25

Iridio

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Comments

Himanshu · Accepted Answer · 2012-11-27 13:01:33Z

1

Use StreamWriter in Append mode. Write your data with WriteLine(data).

using (StreamWriter writer = new StreamWriter("emails.txt", true))
{
    writer.WriteLine(email);
}

edited Nov 27, 2012 at 13:01

Himanshu

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answered Sep 16, 2012 at 6:26

Typist

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Comments

Community · Accepted Answer · 2017-05-23 12:24:57Z

0

Seems like a very easy question with a very easy answer: Open existing file, append a single line

If you post the current code, we can modify that to append instead of overwrite.

edited May 23, 2017 at 12:24

CommunityBot

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answered Sep 16, 2012 at 6:22

hatcyl

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