ASP.NET web services are
the great way to expose your middle tier components via internet. These
components offer no issue communicating across firewalls as they use SOAP as
transport protocols that transmit structured data using HTTP channel. Thus,
message can be easily exchanged through port 80, i.e. through internet data
port without being getting hampered by corporate firewalls or proxy server.
Web
services can fit in the situation when we require integrating disparate systems
written by separate vendors via internet.
Web
services are primarily being used for B2B integration like authorizing
employees, supplier, electronically signing of invoice etc.
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