The System Int64 class is a package library in C# that represents a 64-bit signed integer. It is also known as the long data type.
Here are some code examples:
1. Declaration and initialization of Int64 variable:
`Int64 myNumber = 1234567890L;`
2. Conversion of string to Int64:
`string myString = "9876543210";`
`Int64 myNumber = Convert.ToInt64(myString);`
3. Addition of two Int64 numbers:
`Int64 num1 = 1000000000L;`
`Int64 num2 = 2000000000L;`
`Int64 sum = num1 + num2;`
These code examples show the usage of System Int64 class in C# programming. The first example demonstrates how to declare and initialize an Int64 variable. The second example demonstrates how to convert a string to Int64 using the Convert.ToInt64() method. The third example demonstrates how to add two Int64 numbers and store the result in another Int64 variable.
The System Int64 class is part of the .NET Framework Class Library, which is a package of libraries that provides a collection of reusable classes, interfaces, and value types for developing .NET applications.
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