# 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:

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