https://learn.microsoft.com/hu-hu/dotnet/api/system.iconvertible.toint64?view=netframework-4.8.1&viewFallbackFrom=net-10.0
IConvertible.ToInt64(IFormatProvider) Method (System) | Microsoft Learn
Converts the value of this instance to an equivalent 64-bit signed integer using the specified culture-specific formatting information.
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