private void button1_Click(object sender, EventArgs e)
{
long x = dref.numofrecords(input.Text);
if ((long)record_index < x - 1)
{
record_index++;
}
fill_read_fields();
}
void fill_read_fields()
{
dref.read(filename.Text, record_field, record_index);
name.Text = record_field[0];
phone.Text = record_field[1];
age.Text = record_field[2];
gender.Text = record_field[3];
rec_num.Text = dref.numofrecords(filename.Text).ToString();
rec_no.Text = (record_index + 1).ToString();
}