Calling .Net Assembly Or Dll From SQL Server 2005 At Config Level 80

Hi,
I create a dll assembly with the strong name in VB.Net environment.
Created assembly is registered also.
SQL Server 2005 configuraton level is set at "80"
I want to call that assembly from stored procedure with the database config level at "80"
But when i execute the stored proecure i get the following error
Error Source: "ODSOLE Extended Procedure"
Description: "Invalid Class String"

My Code in VB.Net is given below:
Imports System
Imports System.Reflection
Imports System.Globalization
Imports System.IO
Imports System.data
Imports System.Data.SqlClient
Imports System.Data.SqlTypes
Imports Microsoft.SqlServer.Server
Imports Microsoft.VisualBasic
Imports System.Diagnostics
Imports GreatDataAccess

Namespace Test
Public Class clsTest

Public Shared Sub GenTest()
''''............ some code is here
End Sub
End Class
End Namespace

Stored Procedure
CREATE PROCEDURE [dbo].[PPGenerateFile]
AS
BEGIN
Declare @retVal INT
Declare @comHandler INT
declare @errorSource nvarchar(500)
declare @errorDescription nvarchar(500)
declare @retString nvarchar(100)

-- Intialize the COM component

EXEC @retVal = sp_OACreate Test.clsTest, @comHandler OUTPUT
IF(@retVal <> 0)
BEGIN
--Trap errors if any
EXEC sp_OAGetErrorInfo @comHandler,@errorSource OUTPUT, @errorDescription OUTPUT
SELECT [error source] = @errorsource, [Description] = @errordescription
Return
END



-- Call a method into the component

EXEC @retVal = sp_OAMethod @comHandler,'GenTest()',@retString

IF (@retVal <>0 )
BEGIN
EXEC sp_OAGetErrorInfo @comHandler,@errorSource OUTPUT, @errorDescription OUTPUT
SELECT [error source] = @errorsource, [Description] = @errordescription
Return
END
select @retString

END






Please Help me to solve this problem.