Passing long from ASP to C# method

I have an application where the front end is in ASP and the dll which supports it is written in C#.
I am using 'regasm' command to register it for com inter-operatibility.

C# dll methods are working fine for string type parameters, but not for LONG and INT type parameters. It throws an error saying:
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Microsoft VBScript runtime error '800a01c2'

Wrong number of arguments or invalid property assignment: 'GetReportsData'
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I am passing the LONG parameter from ASP. Example:
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Method in C#
public string takeint(long param)
    {
    //code
    }
________
Call from ASP

var1=object.takeint(Clng("100"))
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This operation throws above mentioned error.
What are the compatible datatypes for LONG and INT of ASP in C# as I can't change the ASP call, but I can change the C# code?

Thanks.

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From: saurav goel