数据类型问题,搞了一个上午没搞好,高手指点一下啊
 存储过程如下:   
 create   proc   DoVote( 
 @CompanyID   varchar(50), 
 @Votesort   varchar(50), 
 @votenum_1   varchar(50), 
 @strIP   varchar(50), 
 @strMAC   varchar(50), 
 @strUserName   varchar(50), 
 @nIP   float(12), 
 @RtnResult   int   output   
 ) 
 as   
 begin   
 	declare   @Count   int 
 	declare   @Address   nvarchar(50) 
 	declare   @RowCount   int 
 		select   @Count=   count(companyid)   from   VoteRecord    
 		where   CompanyID   =   @CompanyID   and   Votesort=@Votesort   and   Mac=@strMAC 
 		select   @RowCount=   count(*)   from   IP   where   startip    <=   @strIP   or   @strIP   > =   endip 
 		if(@RowCount   =   1) 
 			begin 
 				select   @Address   =   country   from   IP   where   startip    <=   @nIP   and   endip   > =   @nIP 
 			end 
 		else 
 			begin 
 				set   @Address   =    '未知IP ' 
 			end   
 	if(@Count=0) 
 		begin 
 			insert   into   VoteRecord(CompanyID,IPAddress,MAC,VoteSort,UserName,Address) 
 			values(@CompanyID,@strIP,@strMAC,@Votesort,@strUserName,@Address)  			 
 			update   vote   set   votenum=@votenum_1    
 			where   CompanyID=@CompanyID   and   Votesort=@Votesort    
 			set   @RtnResult   =   1   --   表示投票成功 
 		   end 
 	else 
 		   begin 
 			set   @RtnResult   =   0         --   表示投票不成功 
 		   end  	             	 
 end     
 ---------------------     
 测试程序如下: 
 ==========   
 USE   [ComData] 
 GO   
 DECLARE	@return_value   int, 
 		@RtnResult   int   
 EXEC	@return_value   =   [dbo].[DoVote] 
 		@CompanyID   =   N '440000001 ', 
 		@Votesort   =   N '1 ', 
 		@votenum_1   =   N '7|4|1|1|10 ', 
 		@strIP   =   N '192.168.2.101 ', 
 		@strMAC   =   N '20:04:12:30:33:25 ', 
 		@strUserName   =   N '企业窗网友 ', 
 		@nIP   =   3232236133.0, 
 		@RtnResult   =   @RtnResult   OUTPUT   
 SELECT	@RtnResult   as   N '@RtnResult '   
 SELECT	 'Return   Value '   =   @return_value     
 报错如下: 
 ==================== 
 消息   8114,级别   16,状态   5,过程   DoVote,第   22   行 
 从数据类型   varchar   转换为   float   时出错。     
 下面是调用存储过程的c#后台程序: 
 ============================== 
                         //投票 
                         public   static   int   DoVote(string   CompanyID,   string   Votesort,   string   votenum_1,   string   strIP,   string   strMAC,   string   strUserName,   double   nIP) 
                         { 
                                     try 
                                     { 
                                &nb