How to retrieve certain data row from table when clicked a button asp.net with c#

SqlConnection con = new SqlConnection("DatabaseConnectionString");

con.Open();
SqlCommand cmd = new SqlCommand("SELECT * FROM Student WHERE ID = " + id, con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);

foreach(DataRow dr in dt.Rows)
{
    idLbl.Text = dr["Id"].ToString();
    nameLbl.Text = dr["Name"].ToString();
    classLbl.Text = dr["ClassName"].ToString();
}