Decimal.ToUInt64() Method in C#

This method is used to convert the value of the specified Decimal to the equivalent 64-bit unsigned integer. A user can also convert a Decimal value to a 64-bit unsigned integer by using the Explicit assignment operator.

Syntax: public static ulong ToUInt64 (decimal d);

Here, the d is the decimal number which is to be converted.

Return Value: It returns a 64-bit unsigned integer equivalent to the specified value i.e. d.

Exception: This method will give OverflowException if the specified value is negative or greater than MaxValue.

Below programs illustrate the use of the above-discussed method:

Example 1:

// C# program to demonstrate the
// Decimal.ToUInt64(Decimal) Method
using System;

class GFG {

    // Main Method
    public static void Main()
    {
        try {

            // Taking decimal variables
            Decimal dec1 = 9223372036854775807.999m;
            Decimal dec2 = 18446744073709551615.784m;

            // using Decimal.ToUInt64(Decimal) Method
            ulong val1 = Decimal.ToUInt64(dec1);

            // using Decimal.ToUInt64(Decimal) Method
            ulong val2 = Decimal.ToUInt64(dec2);

            // Printing the UInt64 value
            Console.WriteLine("The UInt64 value "
                             + "is : {0}", val1);


            // Printing the UInt64 value
            Console.WriteLine("The UInt64 value "
                             + "is : {0}", val2);

        }

        catch (OverflowException e) {
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}

Output:

The UInt64 value is : 9223372036854775807
The UInt64 value is : 18446744073709551615

Example 2: For OverflowException

// C# program to demonstrate the
// Decimal.ToUInt64(Decimal) Method
using System;

class GFG {

    // Main Method
    public static void Main()
    {
        try {

            // Taking the maximum value
            // of Decimal
            Decimal dec1 = Decimal.MaxValue;

            // using Decimal.ToUInt64(Decimal) Method
            // It will give error as decimal number
            // is above the range of UInt64
            ulong val1 = Decimal.ToUInt64(dec1);

            // Printing the UInt64 value
            Console.WriteLine("The UInt64 value "
                               + "is : {0}",val1);
        }

        catch (OverflowException e) {
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}

Output:

Exception Thrown: System.OverflowException

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.decimal.touint64?view=netframework-4.7.2