error the multi-part identifier could not be bound

string conStr = WebConfigurationManager.ConnectionStrings["WebApplication"].ConnectionString;
        SqlConnection con = new SqlConnection(conStr);
        con.Open();
        SqlCommand cmd = new SqlCommand("SELECT GroupWork FROM Meeting WHERE Who like " + Username + "  ", con);
        SqlDataReader read = cmd.ExecuteReader();
        if (read.HasRows)
        {
            while (read.Read())
            {
                Console.WriteLine("{0}\t{1}", read.GetInt32(0), read.GetString(1));
                if (e.Day.DayNumberText == "reader.GetInt32(0)")
                {
                    e.Cell.BackColor = System.Drawing.Color.Red;
                }
            }
        }
        else
        {
            Console.WriteLine("No rows found.");
        }
        con.Close();