random access data file in ASP.NET not permitted?

Question

I am trying to use random access data file in ASP.NET. "rd4" is my application name. It works well in localhost, but it showed the following error message. Setting the read/write permission at the server does not help. Any suggestions will be appreciated.

Attempt by security transparent method 'rd4._default.Button1_Click(System.Object, System.EventArgs)' to access security critical method 'Microsoft.VisualBasic.FileSystem.FileOpen(Int32, System.String, Microsoft.VisualBasic.OpenMode, Microsoft.VisualBasic.OpenAccess, Microsoft.VisualBasic.OpenShare, Int32)' failed.

Assembly 'rd4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' is partially trusted, which causes the CLR to make it entirely security transparent regardless of any transparency annotations in the assembly itself. In order to access security critical code, this assembly must be fully trusted.

This doesn't mean you can't use a random access file. It means you can't use `Microsoft.VisualBasic.FileSystem.FileOpen` to do it, unless your admin makes the assembly fully trusted. — John Saunders, Jan 11 '14 at 01:37
Is it possible to control the trust level through the web.config file? — user1617676, Jan 11 '14 at 02:06
I _should_ know, but I don't. I've never had to play with trust level in ASP.NET. — John Saunders, Jan 11 '14 at 02:51
I have found a solution of using web.config file as follows. Thanks a lot, John. — user1617676, Jan 12 '14 at 18:03

score 2 · Answer 1 · answered Jan 12 '14 at 17:49

2

I have found the solution as follows:

Add the following tag to my web.config:

<configuration>
    <system.web>
        <trust level="Full" />
    </system.web>
</configuration>

answered Jan 12 '14 at 17:49

user1617676

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random access data file in ASP.NET not permitted?

1 Answers1