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Showing content from https://www.geeksforgeeks.org/c-sharp/uint64-maxvalue-field-in-c-sharp-with-examples/ below:

UInt64.MaxValue Field in C# with Examples

Last Updated : 11 Jul, 2025

The MaxValue field of UInt64 Struct is used to represent the maximum value of the 64-bit unsigned long integer. The value of this field is constant means that the user cannot change the value of this field. The value of this field is 18446744073709551615. Its hexadecimal value is

. It is used to avoid the

at runtime.

public const ulong MaxValue = 18446744073709551615;

This field always returns 18446744073709551615.

// C# program to illustrate the
// UInt64.MaxValue Field
using System;

class GFG {

    // Main Method
    static public void Main()
    {
        // display the Maximum
        // value of UInt64 struct
        Console.WriteLine("Maximum Value is: " + UInt64.MaxValue);

        // taking a variable
        ulong var1 = 93422337368375807;

        if (var1.Equals(UInt64.MaxValue))
        {
            Console.WriteLine("Equal..!!");
            Console.WriteLine("Type of var1 is: {0}",
                                 var1.GetTypeCode());
        }

        else 
        {
            Console.WriteLine("Not equal..!!");
            Console.WriteLine("Type of var1 is: {0}",
                                 var1.GetTypeCode());
        }
    }
}

Maximum Value is: 18446744073709551615
Not equal..!!
Type of var1 is: UInt64

• https://learn.microsoft.com/en-us/dotnet/api/system.uint64.maxvalue?view=netstandard-2.1

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