asp.net ten oracle a bağlanırken TNS(ORA-12154) hatası alıyorum.

Asp.net ile oracle a bağlanmaya çalışırken aşağıdaki hatayı alıyorum. denemedeneme.aspx.cs kodum aşağıdaki gibi:

web.config ise şu şekilde:

aldığım hata:

System.Data.OracleClient.OracleException: ORA-12154: TNS:belirlenen bağlantı belirleyici çözümlenemedi  konum: System.Data.OracleClient.OracleException.Check(OciErrorHandle errorHandle, Int32 rc)   konum: System.Data.OracleClient.OracleInternalConnection.OpenOnLocalTransaction(String userName, String password, String serverName, Boolean integratedSecurity, Boolean unicode, Boolean omitOracleConnectionName)   konum: System.Data.OracleClient.OracleInternalConnection..ctor(OracleConnectionString connectionOptions)   konum: System.Data.OracleClient.OracleConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject)   konum: System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options)   konum: System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject)   konum: System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject)   konum: System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject)   konum: System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)   konum: System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)   konum: System.Data.OracleClient.OracleConnection.Open()   konum: denemedeneme._Default.Page_Load(Object sender, EventArgs e)

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