Last Updated : 11 Jul, 2025
This method is used to convert the value of the specified Decimal to the equivalent 64-bit signed integer. A user can also convert a Decimal value to a 64-bit integer by using the Explicit assignment operator.
Syntax: public static long ToInt64 (decimal d); Here, the value is the decimal number which is to be converted. Return Value: It returns a 64-bit signed integer equivalent to the specified value. Exception: This method will give OverflowException if the specified value is less than MinValue or greater than MaxValue.
Below programs illustrate the use of the above-discussed method:
Example 1: csharp
// C# program to demonstrate the
// Decimal.ToInt64(Decimal) Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// Taking decimal variables
Decimal dec1 = -926534668654775808.859m;
Decimal dec2 = 4897498545.2364654M;
// using Decimal.ToInt64(Decimal) Method
// Here long means Int64
long val1 = Decimal.ToInt64(dec1);
// using Decimal.ToInt64(Decimal) Method
// Here long means Int64
long val2 = Decimal.ToInt64(dec2);
// Printing the Int64 value
Console.WriteLine("The Int64 value "
+ "is : {0}", val1);
// Printing the Int64 value
Console.WriteLine("The Int64 value "
+ "is : {0}", val2);
}
catch (OverflowException e)
{
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
}
Output:
The Int64 value is : -926534668654775808 The Int64 value is : 4897498545Example 2:
For
OverflowException csharp
// C# program to demonstrate the
// Decimal.ToInt64(Decimal) Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// Taking decimal variables
Decimal dec1 = Decimal.MinValue;
// Taking the maximum value
// of Decimal
Decimal dec2 = Decimal.MaxValue;
// using Decimal.ToInt64(Decimal) Method
// Here long means Int64
// It will give error
long val1 = Decimal.ToInt64(dec1);
// using Decimal.ToInt64(Decimal) Method
// Here long means Int64
// It will give error
long val2 = Decimal.ToInt64(dec2);
// Printing the Int64 value
Console.WriteLine("The Int64 value "
+ "is : {0}", val1);
// Printing the Int64 value
Console.WriteLine("The Int64 value "
+ "is : {0}", val2);
}
catch (OverflowException e)
{
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
}
Output:
Exception Thrown: System.OverflowExceptionReference:
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