How to Write Data to a Text File using C#

Submitted by donbermoy on Monday, May 26, 2014 - 11:29.

In this tutorial, i will teach you how to create a program that writes data to a text file using C#. This is my continuation of my other tutorial entitled How to Read Data from a Text File using C#. Now, let's start this tutorial! 1. Let's start with creating a Windows Form Application in C# for this tutorial by following the following steps in Microsoft Visual Studio: Go to File, click New Project, and choose Windows Application. 2. Next, add only one Button named btnSave and labeled it as "Save". Insert also one textbox named txtInput for inputting a text that we will write in the text file and a SaveFileDialog named SaveFileDialog1 to save it as a text file. You must design your interface like this: design

3. In your btnSave, put this code below. Filter your saveFileDialog1 to be saved as a text file or a .txt file extension. And add also a title to this control.

            saveFileDialog1.Filter = "Text Files|*.txt";
            saveFileDialog1.Title = "Write Data to Text File.";

Now, create a code to show the dialog in the saveFileDialog1 for saving the text file.

saveFileDialog1.ShowDialog();

Initialize the System.IO.StreamWriter having a File variable. This will write data to the saveFileDialog1 filename. We used the StreamWriter for writing a data to this file of saveFileDialog1.

 System.IO.StreamWriter file = new System.IO.StreamWriter(saveFileDialog1.FileName, true);

Make a string variable named data that will hold the inputted text of txtInput.txt.

 string data = txtInput.Text;

Code for writing data to the file.

file.WriteLine(data);

Close your file.

 file.Close();

Full source code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
 
namespace write_data_to_textfile_using_CSharp
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            saveFileDialog1.Filter = "Text Files|*.txt";
            saveFileDialog1.Title = "Write Data to Text File.";
            saveFileDialog1.ShowDialog();
    
            System.IO.StreamWriter file = new System.IO.StreamWriter(saveFileDialog1.FileName, true);
 
            string data = txtInput.Text;
 
            file.WriteLine(data);
 
            file.Close();
        }
    }
}

Press F5 to run the program. Input: input

Save as sourcodester.txt. Output: output

Hope this helps! :) Best Regards, Engr. Lyndon Bermoy IT Instructor/System Developer/Android Developer/Freelance Programmer If you have some queries, feel free to contact the number or e-mail below. Mobile: 09488225971 Landline: 826-9296 E-mail:[email protected] Add and Follow me on Facebook: https://www.facebook.com/donzzsky Visit and like my page on Facebook at: https://www.facebook.com/BermzISware

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