Convert Decimal to long in CSharp

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using System;

class MainClass
{
    public static void DecimalToU_Int64( decimal argument )
    {
        object Int64Value = null;
        object UInt64Value = null;

        // Convert the argument to a long value.
        try
        {
            Int64Value = decimal.ToInt64( argument );
        }
        catch( Exception ex )
        {
            Int64Value = null;
        }

        // Convert the argument to a ulong value.
        try
        {
            UInt64Value = decimal.ToUInt64( argument );
        }
        catch( Exception ex )
        {
            UInt64Value = null;
        }

        Console.WriteLine( Int64Value);
        Console.WriteLine( UInt64Value );
    }

    public static void Main( )
    {
        DecimalToU_Int64( 123M );
    }
}