The compiler parses unsigned integer as a signed integer for C#

[transistors]

Hi drasil,
One more problem. The compiler seems to use a "signed long" for all integers in an ASN1 file.
I have an unsigned integer as follow which is parsed as a signed long:

byteCounter [0] INTEGER (0..18446744073709551615),
`
This is parsed as a signed integer in C#"

private long byteCounter_ ;
    [ASN1Integer( Name = "" )]
    [ASN1ValueRangeConstraint ( 

        Min = 0L, 

        Max = 18446744073709551615L 

        ) ]

        [ASN1Element ( Name = "byteCounter", IsOptional =  false , HasTag =  true, Tag = 0 , HasDefaultValue =  false )  ]

Visual Studio Error:

Error CS0266 Cannot implicitly convert type 'ulong' to 'long'. An explicit conversion exists (are you missing a cast?)