Как работать с текстовыми файлами

using System;
using System.Windows.Forms;
using System.IO;
 
namespace DataGridViewExample
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            // Open the contact_list file for reading. File is placed in the debug folder.
            StreamReader sr = new StreamReader("contact_list.txt");
            // Variable to store each row.
            string dataRow = "";
            // String array needed to determin number of columns to use. 
            string[] headerRow;
 
            int columns = 0;
            // Object array used to store each line of data from the text file.
            object[] row;
 
            // Read the first line of the text file. Then split the data using a comma character
            headerRow = sr.ReadLine().Split(',');
            // Store the length of headerRow string array, this will tell us how many columns we need.
            columns = headerRow.Length;
 
            // "For Loop" below is used to add column headers to the DataGridView control. The name of each column
            // header begins with "Header" followed by a number. 
 
            for (int cols = 0; cols < columns; cols++)
            {
                dgv.Columns.Add("Header " + cols, "Header " + cols);
            }
 
            // At this point, column headers have been added.
            // Now all that remains is to add the rows. Read the file line by line, using a while loop
            // and the ReadLine() method. When reading each line make sure it is not a blank line. If it is a blank line
            // skip the line and read the next line. 
 
            while ((dataRow = sr.ReadLine()) != null)
            {
                if (dataRow != "")
                {
                    row = dataRow.Split(','); // Split the dataRow string variable and store each data into an Object array.
                    dgv.Rows.Add(row); // Add the row.
                }
            }
 
        }
    }
}