GetSchema and Schema Collections
In Connection classes, each of the managed .NET Framework providers implements the GetSchema method, which is used to retrieve schema information about the connected database, and the schema information returned from the GetSchema method is presented as a DataTable. The GetSchema method is an overloaded method that provides optional parameters for specifying the returned collection of schemas and limiting the amount of information returned.
http://msdn.microsoft.com/en-us/library/ms254934(v=vs.110).aspx
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