Declare @PortNumber VarChar(7)

Exec Xp_RegRead

@RootKey='HKEY_LOCAL_MACHINE',

@Key='Software\Microsoft\Microsoft Sql Server\SQLEXPRESS\MSSQLServer\SuperSocketNetLib\Tcp',

@Value_Name='TcpPort',

@Value=@PortNumber OutPut

Print 'Port Number:'

Print @PortNumber

When you execute this you will get a problem to enable XP_CMDshell.You can enable by this.Read the article at:
Enabling xp_cmdshell in SQL Server 2005

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