Tuples in DotNet

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what is difference between Window and page in WPF

The HttpGetEnabled property of ServiceMetadataBehavior is set to true and the HttpGetUrl property is a relative address, but there is no http base address. Either supply an http base address or set HttpGetUrl to an absolute address.

Once created, the fields in the Tuple cannot be mutated. This makes the Tuple similar to a value type.
A 2-tuple is called a pair.
A 3-tuple is called a triple.
A 4-tuple is called a quadruple.
A 5-tuple is called a quintuple.
A 6-tuple is called a sextuple.
A 7-tuple is called a septuple.
Larger tuples are called n-tuples.