问从ASP.NET连接Oracle11g

EN

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using Oracle.DataAccess.Client;

    namespace WebApplication1
    {
        public partial class index : System.Web.UI.Page
        {
            protected void Page_Load(object sender, EventArgs e)
            {
                OracleConnection connection = new OracleConnection("Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=myhost)(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=mySid)));User Id=xxx;Password=xxx;");
                try
                {
                    connection.Open();
                }
                catch (Exception exp)
                {
                    Console.WriteLine(exp.Message);
                }
            }
        }

} 

Server Error in '/' Application.

The provider is not compatible with the version of Oracle client

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: Oracle.DataAccess.Client.OracleException: The provider is not compatible with the version of Oracle client

Source Error: 


Line 13:         protected void Page_Load(object sender, EventArgs e)
Line 14:         {
Line 15:             OracleConnection connection = new OracleConnection("Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=xxxx)(PORT=xxxx)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=xxx)));User Id=xxx;Password=xxxx;");
Line 16:             try
Line 17:             {

Source File: c:\PLanguages\PSources\C#\WebApplication1\WebApplication1\index.aspx.cs    Line: 15 

Stack Trace: 


[OracleException (0x80004005): The provider is not compatible with the version of Oracle client]
   Oracle.DataAccess.Client.OracleInit.Initialize() +624
   Oracle.DataAccess.Client.OracleConnection..cctor() +903

[TypeInitializationException: The type initializer for 'Oracle.DataAccess.Client.OracleConnection' threw an exception.]
   Oracle.DataAccess.Client.OracleConnection..ctor(String connectionString) +0
   WebApplication1.index.Page_Load(Object sender, EventArgs e) in c:\PLanguages\PSources\C#\WebApplication1\WebApplication1\index.aspx.cs:15
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +92
   System.Web.UI.Control.LoadRecursive() +54
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +772