Raising Condition in where clause.

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SQL-Server-2005

SQL-Server

I am making a procedure for usersearch that has the following parameter:

@BusinessName nvarchar(200) = null,
@BusinessDescription nvarchar(250) =null

create procedure [dbo].[UserSearch]
(
@BusinessName nvarchar(200) = null,
@BusinessDescription nvarchar(250) =null
)
as
if(@BusinessName  is not null  and @BusinessDescription is null)
begin
select BusinessName,BusinessLikes,BusinessUrl,BusinessAddress2,CountryName, UserId, BusinessCity,BusinessAddress1,StateName,BusinessCreationDate,BusinessTotalReviews,BusinessRatingValue,BusinessKeywords,
            case when BusinessLogo is null or BusinessLogo = '' then 'default.gif' 
            else BusinessLogo end as BusinessLogo,BusinessCategories,substring(BusinessBriefDescription,1,60) as BusinessBriefDescription,BusinessId,BusinessPostalCode
            from  tblBusinesses where BusinessStatus =1 and  (BusinessName Like  @BusinessName + '%')  
end

Now I need:

(if @businessdescription is not null and @businessname is null)

The problem is that I can use this condition but for this I have to use again the avobe select query. I only need to change in where condition. Can I use my next condition in where clause? If yes than how?