How to pass a db-Name to a stored procedure

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stored-procedure

Hi all,
I'd like to know, to pass a db-Name to a stored procedure

EDIT
my code is like

USE [master];
GO
 
SET ANSI_NULLS ON 
GO 
SET QUOTED_IDENTIFIER ON 
GO 
 
CREATE PROCEDURE [dbo].[usp_BACKUP_DB]
(
@DB_Name	VARCHAR(50),	-- Provide the DB's Name, whitch is to Back Up
@Drive	 VARCHAR(1)	-- Provide a Drive-Letter, e.g. C
)
 
AS
 
SET NOCOUNT ON 
 
IF (NOT @DB_Name IS NULL) AND (NOT @Drive IS NULL)
 
SET @_DB_Name = RTRIM(LTRIM(@DB_Name))
SET @_Drive = UPPER(RTRIM(LTRIM(@Drive)))
 
ALTER DATABASE @DB_Name
SET RECOVERY FULL;	 -- SET Recovery-Mode to FULL
GO

But @DB_Name and @Drive are not accepted by SQL Server:
Msg 102, Level 15, State 1, Procedure usp_BACKUP_DB, Line 20
Incorrect syntax near '@DB_Name'...