Error Accessing T-SQL UDF From CLR UDF

Hi all,

I am experiencing the following error when I try to access a T-SQL UDF from within a SQL statement that I execute from a CLR UDF.Msg 6522, Level 16, State 1, Line 2
A .NET Framework error occurred during execution of user-defined routine or aggregate "HelloWorldCLR":
System.Data.SqlClient.SqlException: This statement has attempted to access data whose access is restricted by the assembly.
System.Data.SqlClient.SqlException:
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
at System.Data.SqlClient.SqlInternalConnectionSmi.EventSink.DispatchMessages(Boolean ignoreNonFatalMessages)
at Microsoft.SqlServer.Server.SmiEventSink_Default.DispatchMessages(Boolean ignoreNonFatalMessages)
at Microsoft.SqlServer.Server.SmiEventSink_Default.DispatchMessages(Boolean ignoreNonFatalMessages)
at System.Data.SqlClient.SqlDataReaderSmi.InternalNextResult(Boolean ignoreNonFatalMessages)
at System.Data.SqlClient.SqlDataReaderSmi.NextResult()
at System.Data.SqlClient.SqlCommand.RunExecuteReaderSmi(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
at System.Data.SqlClient.SqlCommand.ExecuteScalar()
at UserDefinedFunctions.HelloWorldCLR()I have tried the SQL BOL and Google with no luck.

Here is the sample code I am using to produce this error:

HelloWorldUDF.sqlIF OBJECT_ID (N'dbo.HelloWorldUDF') IS NOT NULL
DROP FUNCTION dbo.HelloWorldUDF
GO

CREATE FUNCTION dbo.HelloWorldUDF() RETURNS varchar(100)
AS
BEGIN
RETURN 'Hello World'

END
GOHelloWorldCLR.cs using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using Microsoft.SqlServer.Server;

public partial class UserDefinedFunctions
{
[Microsoft.SqlServer.Server.SqlFunction( DataAccess = DataAccessKind.Read )]
public static SqlString HelloWorldCLR()
{
using ( SqlConnection conn = new SqlConnection( "context connection=true" ) )
{
conn.Open();

SqlCommand command = new SqlCommand( "SELECT dbo.HelloWorldUDF()", conn );
return new SqlString( command.ExecuteScalar().ToString() );
}
}
};

Test query:  select dbo.HelloWorldUDF()
select dbo.HelloWorldCLR()  Could some one please confirm that this should be possible or not? Thanks! Joe.