VS2008下连接MySql数据库错误???

using System;

using Microsoft.VisualStudio.Data;

using System.Data.Common;

using Microsoft.VisualStudio.Data.AdoDotNet;

using System.Data;



namespace MySql.Data.VisualStudio

{

    class StoredProcedureColumnEnumerator : DataObjectEnumerator

    {

        public override DataReader EnumerateObjects(string typeName, object[] items, 

            object[] restrictions, string sort, object[] parameters)

        {

            DbConnection conn = (DbConnection)Connection.GetLockedProviderObject();

            try

            {

                string spName = String.Format("{0}.{1}", restrictions[1],restrictions[2]);



                if (conn.State != ConnectionState.Open)

                    conn.Open();



                string[] parmRest = new string[5];

                parmRest[1] = (string)restrictions[1];

                parmRest[2] = (string)restrictions[2];

                parmRest[3] = (string)restrictions[3];

                DataTable parmTable = conn.GetSchema("Procedure Parameters", parmRest);



                DbCommand cmd = conn.CreateCommand();

                cmd.CommandText = spName;

                cmd.CommandType = CommandType.StoredProcedure;



                foreach (DataRow row in parmTable.Rows)

                {

                    if (row["ORDINAL_POSITION"].Equals(0)) continue;



                    DbParameter p = cmd.CreateParameter();

                    p.ParameterName = row["PARAMETER_NAME"].ToString();

                    p.Value = GetDefaultValue(row["DATA_TYPE"].ToString());

                    cmd.Parameters.Add(p);

                }



                using (IDataReader reader = cmd.ExecuteReader(CommandBehavior.SchemaOnly))

                {

                    DataTable dt = reader.GetSchemaTable();

                    dt.Columns.Add(new DataColumn("RoutineName", typeof(string)));

                    foreach (DataRow row in dt.Rows)

                    {

                        row["RoutineName"] = restrictions[2];

                        string basedb = row["BaseSchemaName"] as string;

                        if (String.IsNullOrEmpty(basedb) || row["BaseSchemaName"] == DBNull.Value)

                            row["BaseSchemaName"] = cmd.Connection.Database;

                    }



                    return new AdoDotNetDataTableReader(dt);

                }

            }

            finally

            {

                Connection.UnlockProviderObject();

            }

        }



        private object GetDefaultValue(string dataType)

        {

            if (dataType == "VARCHAR" || dataType == "VARBINARY" ||

                dataType == "ENUM" || dataType == "SET" || dataType == "CHAR")

                return "";

            return 0;

        }

    }

}