using System; class Program { static void Main() { Console.Write("Enter an 8-byte signed integer: "); long value = Console.GetInt64(); Console.WriteLine("You entered: {0}", value); } }
using System; using System.IO; class Program { static void Main() { using (FileStream stream = File.OpenRead("data.bin")) { long value = stream.GetInt64(); Console.WriteLine("First value in file: {0}", value); } } }In this code sample, we open a binary file called "data.bin" using a FileStream object, and then get the first 8-byte signed integer using the GetInt64 method. The value is then displayed using Console.WriteLine. In summary, the GetInt64 method is a convenient way to read 8-byte signed integers from the standard input stream or from a file. It is part of the System namespace in .NET Framework and does not require any additional package or library installation.