update , delete in text file

[virendra_sharma]

Hi frnz,

i am having text file , in that "ID", "firstname","lastname","email-id","phoneno" is the first row and same column name i have declared in gridview, i am also having update and delete option in gridview . now what i wanted to do is when user clicks on perticular record from gridview for to update or delete , it should be updated or deleted from text file.

in advance
thanks for your helppppppp :)

[abelLazm]

Check this link it has detailed help on using text files as databases

[Mitja Bonca]

Here, I did the code you would like to have.
There is maybe some work to be done in the cell vadidating (data validation; if email and tel.number are correct), and this is about it.
When you do some changes, you press one button, and all it saves automatically (or you update or delete).

Code:

public partial class Form1 : Form
    {
        private string filePath;
        List<Addressar> list;
        public Form1()
        {
            InitializeComponent();
            filePath = @"C:\1\Addressar.txt";
            list = new List<Addressar>();            
        }

        protected override void OnShown(EventArgs e)
        {
            GetData();
            dataGridView1.AllowUserToAddRows = true;
            dataGridView1.DataSource = new BindingSource(list, null);
        }

        private void GetData()
        {
            if (System.IO.File.Exists(filePath))
            {
                using (StreamReader sr = new StreamReader(filePath))
                {
                    string line;
                    while ((line = sr.ReadLine()) != null)
                    {
                        string[] columns = line.Split(new string[] { "-:-" }, StringSplitOptions.RemoveEmptyEntries);
                        Addressar adr = new Addressar();
                        adr.Id = int.Parse(columns[0]);
                        adr.First = columns[1];
                        adr.Last = columns[2];
                        adr.Email = columns[3];
                        adr.Phone = columns[4];
                        list.Add(adr);
                    }
                }
                if (list.Count == 0)
                    MessageBox.Show("File exists, but there is no data inside of it.");
            }
            else
                MessageBox.Show("File to read data from it, does not yet exist.");
        }

        private void buttonUpdate_Click(object sender, EventArgs e)
        {
            StringBuilder sb = new StringBuilder();
            foreach (Addressar adr in list)
            {
                string[] columns = new string[5];
                columns[0] = adr.Id.ToString();
                columns[1] = adr.First;
                columns[2] = adr.Last;
                columns[3] = adr.Email;
                columns[4] = adr.Phone;
                sb.AppendLine(String.Join("-:-", columns));
            }
            if (sb.Length > 0)
            {              
                System.IO.File.Delete(filePath);
                using (FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate))
                {
                    using (TextWriter tw = new StreamWriter(fs))
                    {
                        tw.Write(sb.ToString());
                        MessageBox.Show("Update has been done successfully.","Data updating");
                    }
                }
            }
        }
    }

    class Addressar
    {
        public int Id { get; set; }
        public string First { get; set; }
        public string Last { get; set; }
        public string Email { get; set; }
        public string Phone { get; set; }
    }

[virendra_sharma]

thanks a lotssss for your help :)
but i need code for web application . in that i am using .csv file as database and i want to insert,update and delete in the same .csv file .