Hi! i want to retreive value from a table named costomer, this code is working , but there is a problem that is always give the first row value, and i required the last inserted value.

SqlConnection con = new SqlConnection();
con.ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString01"].ToString();
SqlCommand cmd = new SqlCommand("select cost_id from costomer",con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
string temp = ds.Tables[0].Rows[0][0].ToString()

can anyone tell me how to retreive last value of table????