Why does MySQLDataAdapter.Fill() takes so long for the first time.

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C#

MySQL

DataAdapter

Hi, In the code below da.Fill(ds) takes around 500ms for the first and drops to 50ms for the second if I call the method without restarting the application. I tried DataReader same thing happens with it. On the other hand I used LINQ to SQL (On MS SQL Server) which returned the records in around 50ms for the first time.

public List<GetEmployeeRightsResult> GetEmployeeRights(System.Nullable<int> p_EmployeeID)
       {
           try
           {


               List<GetEmployeeRightsResult> records = new List<GetEmployeeRightsResult>();

               if (Connection.State != ConnectionState.Open)
               {
                   Connection.Open();
               }

               Command = new MySqlCommand("GetEmployeeRights", Connection);
               Command.CommandType = CommandType.StoredProcedure;

               //Add Parameters is procedures requires.
               Command.Parameters.Add(new MySqlParameter("p_EmployeeID", p_EmployeeID));


               if (Transaction != null)
               {
                   Command.Transaction = Transaction;
               }

               da = new MySqlDataAdapter();
               da.SelectCommand = Command;

               ds = new DataSet();

               Stopwatch sw = new Stopwatch();
               sw.Start();
               da.Fill(ds);
               sw.Stop();
               //Writing Execution Time in label
               string ExecutionTimeTaken = string.Format("Minutes :{0}\nSeconds :{1}\n Mili seconds :{2}", sw.Elapsed.Minutes, sw.Elapsed.Seconds, sw.Elapsed.TotalMilliseconds);



               foreach (DataRow Row in ds.Tables[0].Rows)
               {
                   GetEmployeeRightsResult result = new GetEmployeeRightsResult()
                   {
                       FormID = Convert.ToInt32(Row["FormID"]),
                       FormName = Row["FormName"] == DBNull.Value ? null : (string)Row["FormName"],
                       CanAccess = Convert.ToBoolean(Row["CanAccess"]),
                       Type = Row["Type"] == DBNull.Value ? null : (string)Row["Type"],

                   };

                   records.Add(result);
               }


               return records;
           }
           catch
           {
               throw;
           }
       }

Just 70 lines of record.

BEGIN

IF(p_EmployeeID = 0)
THEN
	SELECT FormID,FormName,CanAccess,Type from RightsCatalog; 
ELSE
	SELECT
		 ER.StoreID
		,ER.FormID
		,FormName
		,IFNULL(ER.CanAccess,1) as CanAccess
		,RC.Type 
		FROM EmployeeRight ER 
		RIGHT OUTER JOIN RightsCatalog RC 
		ON RC.FormID = ER.FormID  
		WHERE EmployeeID = p_EmployeeID;
END IF;
-- ****** [Objec...  ts ] Script Date: 02/24/2014 10:00:33 *******

END