C# Datagridview

Hi Friends,

how to write" if"" condition  to find number of rows and assign each row ""Column1"" value  to string.

int nos = 0;

nos = dataGridView1.CurrentCell.RowIndex;

  if (nos == 0)
            {
 TxtInput30 = dataGridView1.Rows[0].Cells["Column1"].Value.ToString();
}

if (nos == 1)
            {


               TxtInput30_2 = dataGridView1.Rows[1].Cells["Column1"].Value.ToString();
}