Extract code snippets from how-to-retrieve-a-list-of-the-hidden-worksheets-in-a-spreadsheet.md

[mikeebowen]

Closes #281

[learn-build-service-prod]

Learn Build status updates of commit a72d776:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/spreadsheet/how-to-retrieve-a-list-of-the-hidden-worksheets-in-a-spreadsheet.md	✅Succeeded
samples/samples.sln	✅Succeeded
samples/spreadsheet/retrieve_a_list_of_the_hidden_rows_or_columns/cs/Program.cs	✅Succeeded
samples/spreadsheet/retrieve_a_list_of_the_hidden_worksheets/cs/Program.cs	✅Succeeded
samples/spreadsheet/retrieve_a_list_of_the_hidden_worksheets/vb/Program.vb	✅Succeeded

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[twsouthwick]

Suggested change

You can use the **GetHiddenSheets** method, to retrieve a list of the hidden worksheets in a workbook. The **GetHiddenSheets** method accepts a single parameter, a string that indicates the path of the file that you want to examine. The method works with the workbook you specify, filling a **[List\<T\>](https://msdn2.microsoft.com/library/6sh2ey19)** instance with a reference to each hidden **Sheet** object.

You can use the **GetHiddenSheets** method, to retrieve a list of the hidden worksheets in a workbook. The **GetHiddenSheets** method accepts a single parameter, a string that indicates the path of the file that you want to examine. The method works with the workbook you specify, filling a **[List\<T\>](/dotnet/api/system.collections.generic.list-1)** instance with a reference to each hidden **Sheet** object.

[twsouthwick]

We can do a pass to convert all these to more modern links (and then to xrefs if we can get that enabled) later