问无法找到类型或NameSpace“实用程序”

EN

namespace Utilities
{
    public class DatabaseManager
    {
        public string commandText;
        OdbcCommand cmd = new OdbcCommand();
        OdbcTransaction _tran = null;

        public DatabaseManager(String dbConn) {
            OdbcConnection  _conn = new OdbcConnection(dbConn);
            cmd = _conn.CreateCommand();
            _conn.Open();
        }

        public void setParameter(string name, OdbcType type, object value)
        {
            cmd.Parameters.Add(name, type).Value = value;
        }
    }
}

using System;
using System.Data;
using System.Collections.Generic;
using System.Linq;
using System.Data.Odbc;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;
using Utilities;     // This line have error highlighted in red color