how to get id value From Table in text box c#? windows app

Question

con.Open();

SqlCommand cmd = new SqlCommand("select Description,Tax_ID, Unit_id from Product where Name= '" + producttxt.Text + "'", con);

SqlDataReader sdr = cmd.ExecuteReader();

while (sdr.Read())

{

ProductExists = 1;

dectxt.Text = sdr.GetString(0);

txtqty.Text = sdr.GetString(2);

txttax.Text = sdr.GetString(1);

ProductExists = 1;

}

con.Close();

 

How to Get  Tax_ID & Unit_ID  his Values   from Tax And Unit Database table......???