how to edit only selected row in datagridview

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C#

hi sir;

i want to edit only selected rows in datagridview.

but
in my case only first row is edited i want that whenever
i select any row and click on edit button then particular
row data is displayed in textbox.
below is my code:

Bind();
 int i;

i = dataGridView1.SelectedCells[0].RowIndex;
                txtto.Text = dataGridView1.Rows[i].Cells[5].Value.ToString();
                txtsubject.Text = dataGridView1.Rows[i].Cells[1].Value.ToString();
                txtfrom.Text = dataGridView1.Rows[i].Cells[8].Value.ToString();
                txtdisp.Text = dataGridView1.Rows[i].Cells[3].Value.ToString();
                txtdepthide.Text = dataGridView1.Rows[i].Cells[6].Value.ToString();
 dateTimePicker1.Value =Convert.ToDateTime(dataGridView1.Rows[i].Cells[7].Value.ToString());
               txtrefer.Text = dataGridView1.Rows[i].Cells[4].Value.ToString();

please help me your answer really helpful for me.

thanks in advance!