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 :)

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

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).


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

        protected override void OnShown(EventArgs e)
            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];
                if (list.Count == 0)
                    MessageBox.Show("File exists, but there is no data inside of it.");
                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)
                using (FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate))
                    using (TextWriter tw = new StreamWriter(fs))
                        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; }
commented: Nice. +14

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 .