Channel sales is wherein the product reaches the end user 
from the producer end, through the typical distribution 
channel. Example: 1) Producer--Distributor--Retailer--
Customer
2) Producer--Agent--Distributor--reatailer--customer
3) Producer--Sales Personell--customer

Corporate Sales is wherein corporate houses are directly 
approached by the sales team. 
(Note: To me Corporate sales is one of the channels is only)

hope this helps

channel sales is company as not supply to directly to the 
customer 
that is Company-distributir(Sales associates)-Reatailer-
customer
Corporate sales is company producing product are goes to 
direct;y through sales

Channel Sales is basically the sales in which you have to 
approach in channels,eg:reliance mutual funds are sells 
through various modes directly/indirectly, a relationship 
manager who is liable to maintain the relationship with the 
bankers/sales manager of various banks so that he /she can 
do the business for the company,this is channel sales
marketer-relationship manager-banker-client

Corporate Sales is basically you are approaching directly 
to a company for sales or approaching directly to the 
corporates...

Any company who source their business i.e. Finance, Trading 
etc. through their respective channel partners/ 
distributors is called channelsales. These channels then 
sell the product ( what so ever )in the market to retailers 
or the consumer. Where as in the case of Corporate sales 
the Parent company ( who have their channelsales partners 
also ) aproach the other company directly and sell their 
product directly is called Corporate Sales. Actually it is 
called B2B sales ( Business to Business Sales ). You are 
not intracting with one single person for the sale. You 
will follow the different method of sales, wherein you will 
have to find out the key decission maker and then will have 
to show him the product and have to inform them how your 
product is better than the others, and also how are you 
going to benifit them after sales. In this case you look 
for bulk sales. Once you have build your reputation with 
some company you might get orders in good numbers.