How to retrieve data from a datagridview in textboxes

//this is my textboxes that will retrieve data
textBox5.Text = "";
textBox6.Text = "";
textBox8.Text = "";
textBox7.Text = "";
//this is the code of mine it works only when i select a row from the datagridview i need it work when i select a cell in this row
string[] arr = new string[4];
int i = 0;
foreach (DataGridViewCell item in dataGridView2.SelectedCells)
{
    arr[i] = item.Value.ToString();
    i++;
}
textBox5.Text = arr[0].ToString();
textBox6.Text = arr[1].ToString();
textBox8.Text = arr[2].ToString();
textBox7.Text = arr[3].ToString();