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;`
Brief Description:
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.
Package Library:
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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