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Provide option to select the paper source in code, before performing the silent printing.
MSDN References:
Printer Settings: https://docs.microsoft.com/en-us/dotnet/api/system.drawing.printing.printersettings.papersourcecollection?view=dotnet-plat-ext-3.1
Page Settings : https://docs.microsoft.com/en-us/dotnet/api/system.drawing.printing.pagesettings.papersource?view=dotnet-plat-ext-3.1