Using Wildcard

alter procedure sp_ADsearch @tbname varchar(1000),@searchproduct nvarchar(500)

as

declare @sqlstr nvarchar(1000)

set @sqlstr='select * from '

set @sqlstr= @sqlstr + @tbname

set @sqlstr= @sqlstr + ' where name like '

set @sqlstr= @sqlstr + '%' + @searchproduct + '%'

exec sp_executesql @sqlstr

--

exec sp_ADsearch product,ee

when executing the procedure i am getting an error "Incorrect syntax near 'ee'.".

whats wrong with the syntax? how to use % along with variables