Edit selected item of datagridview and .txt file as well

Question

Hi, friends i want to edit contact in my phone directory application using datagrid, textbox and a button
please help me !!

and my second question is about deleting I had completed deleting process but some time it doesn't work correctly!

  !!here is the code!!

 

       

 

private void button2_Click(object sender, EventArgs e)

{

List<string> myList = File.ReadAllLines("contact.txt").ToList(); //read

foreach (DataGridViewRow item in this.dataGridView1.SelectedRows)

{

try

{

DialogResult result = MessageBox.Show("are you sure to delete!!", "Warning!!", MessageBoxButtons.YesNo, MessageBoxIcon.Question);

if (result == DialogResult.Yes)

{

myList.RemoveAt(item.Index);

File.WriteAllLines("contact.txt", myList.ToArray());

dataGridView1.Rows.RemoveAt(item.Index);

}

else

{

this.dataGridView1.Focus();

}

}

catch

{

MessageBox.Show("unable to delete", "error", MessageBoxButtons.OK, MessageBoxIcon.Error);

}

}

}