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Decimal.ToUInt64() Method in C#

Last Updated : 11 Jul, 2025
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:
Output:
The UInt64 value is : 9223372036854775807
The UInt64 value is : 18446744073709551615
Example 2: For OverflowException
Output:
Exception Thrown: System.OverflowException
Reference:
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