C# save text to file code example

Example 1: asp.net c# write string to text file

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

Example 2: c# write file

class WriteTextFile
{
    static void Main()
    {

        // These examples assume a "C:\Users\Public\TestFolder" folder on your machine.
        // You can modify the path if necessary.

        // Example #1: Write an array of strings to a file.
        // Create a string array that consists of three lines.
        string[] lines = { "First line", "Second line", "Third line" };
        // WriteAllLines creates a file, writes a collection of strings to the file,
        // and then closes the file.  You do NOT need to call Flush() or Close().
        System.IO.File.WriteAllLines(@"C:\Users\Public\TestFolder\WriteLines.txt", lines);

        // Example #2: Write one string to a text file.
        string text = "A class is the most powerful data type in C#. Like a structure, " +
                       "a class defines the data and behavior of the data type. ";
        // WriteAllText creates a file, writes the specified string to the file,
        // and then closes the file.    You do NOT need to call Flush() or Close().
        System.IO.File.WriteAllText(@"C:\Users\Public\TestFolder\WriteText.txt", text);

        // Example #3: Write only some strings in an array to a file.
        // The using statement automatically flushes AND CLOSES the stream and calls
        // IDisposable.Dispose on the stream object.
        // NOTE: do not use FileStream for text files because it writes bytes, but StreamWriter
        // encodes the output as text.
        using (System.IO.StreamWriter file =
            new System.IO.StreamWriter(@"C:\Users\Public\TestFolder\WriteLines2.txt"))
        {
            foreach (string line in lines)
            {
                // If the line doesn't contain the word 'Second', write the line to the file.
                if (!line.Contains("Second"))
                {
                    file.WriteLine(line);
                }
            }
        }

        // Example #4: Append new text to an existing file.
        // The using statement automatically flushes AND CLOSES the stream and calls
        // IDisposable.Dispose on the stream object.
        using (System.IO.StreamWriter file =
            new System.IO.StreamWriter(@"C:\Users\Public\TestFolder\WriteLines2.txt", true))
        {
            file.WriteLine("Fourth line");
        }
    }
}
 //Output (to WriteLines.txt):
 //   First line
 //   Second line
 //   Third line

 //Output (to WriteText.txt):
 //   A class is the most powerful data type in C#. Like a structure, a class defines the data and behavior of the data type.

 //Output to WriteLines2.txt after Example #3:
 //   First line
 //   Third line

 //Output to WriteLines2.txt after Example #4:
 //   First line
 //   Third line
 //   Fourth line

Example 3: write text files with C#

// Create a file to write to.
string createText = "Hello and Welcome" + Environment.NewLine;
File.WriteAllText(path, createText);

...

// Open the file to read from.
string readText = File.ReadAllText(path);

Example 4: save data from textbox to text file c#

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.IO;namespace Save_File_txt{    public partial class Form1 : Form    {        public static string dirParameter = AppDomain.CurrentDomain.BaseDirectory + @"\file.txt";        public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            SaveEvent();        }        public void SaveEvent()        {            DialogResult result;            result = MessageBox.Show("Do you want to save file?", "Konfirmasi", MessageBoxButtons.YesNo, MessageBoxIcon.Question);            if (result == DialogResult.No)            {                return;            }            if (result == DialogResult.Yes)            {                try                {                    if (textBox1.Text != null && textBox2.Text != null && textBox3.Text != null)                    {                        saveFile(textBox1.Text, textBox2.Text, textBox3.Text);                    }                }                catch (Exception err)                {                    MessageBox.Show(err.ToString());                }            }        }        public void saveFile(string name,string telephone, string address)        {            string Msg = name + ";" + telephone + ";" + address;              // Save File to .txt            FileStream fParameter = new FileStream(dirParameter, FileMode.Create, FileAccess.Write);            StreamWriter m_WriterParameter = new StreamWriter(fParameter);            m_WriterParameter.BaseStream.Seek(0, SeekOrigin.End);            m_WriterParameter.Write(Msg);            m_WriterParameter.Flush();            m_WriterParameter.Close();        }    }}