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I have a Web Service that requires an SqlConnection. There are 5 web methods that use this SqlConnection, but presently they are declared (locally) in each of the methods. Would it be acceptable to make it a global variable in this case?
Thanks
No.
According to the documentation for SqlConnection:
Since your different web methods could be called simultaneously from different threads, you’d better not share the same connection instance between them.
The typical pattern is that every time you need a database connection, you create a new instance, and Dispose it as soon as you’re done. Threading is one of the reasons. Connection pooling makes sure it’s not too expensive to create all those connection instances.