please find code here for using start orchestration, and correlating ports for receiving the data returned from the called orchestration.
please find code here for sorting and grouping in biztalk maps.
please find the code here for sequential convoy for flat files with header schema containing the number of individual messages in the body schema that would be split by flat file disassembler.
Please find the sample code for using If-Else construct in expression shape here
Here is a link to the post in my previous blog
Here is the link to the post in my previous blog.