这样的SQL语句怎么转换成存储过程

SQL语句，在ASP中使用：
Select Count(id) From SysMessage Where typeid = 1 " & strwhereand & " AND (charindex('," & userlname & ",',','+view_userlname+',') = 0 OR view_userlname is null)

我写的存储过程，但是语法检查有问题

CREATE PROCEDURE count_SysMessage
@userlname nvarchar(100)
@strwhereand nvarchar(300)
AS
Select Count(id) From SysMessage Where typeid = 1 @strwhereand AND (charindex(@userlname,','+view_userlname+',') = 0 OR view_userlname is null)
GO

报错是@strwhereand有错误，我对存储过程还不爱熟悉，我应该怎么写，请大家赐教