The the Trust level, as a temporary set the trust level in the web.config to Full

Does anyone have any views on GAC vs bin installs .....I am not technical really but from day one all of the simple "set trust to full" or install in GAC seemed to be slightly missing the point and my concerns were further raised when reading this

www.bluedoglimited.com/.../ViewPost.aspx?id=99

First of all thanks for reply
The dll is in GAC , but same exception
I even changed the trust level to Full also ......same exception

I think it might depend on what you are trying to do. If you are trying to access certain admin level stuff in the object model, but the webpart  is running under only a reader role then you will have a problem. You might need to impersonate the webpart to run under an admin account.

When I am trying to access sharepoint object model I am getting exception  . just I am getting the context of the site.

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//Code I have written

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output.Write(SPEncode.HtmlEncode(SPControl.GetContextWeb(Context).Name.ToString()));

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The Exception I am getting

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Request for the permission of type Microsoft.SharePoint.Security.SharePointPermission, Microsoft.SharePoint.Security, Version=11.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c failed.

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where are you keeping your dll?

I created one cab project and by using stsadm command I add the cab
project to portal

Stsadm -o addwppack -filename "........" -url http://hostname

Stsadm -o addwppack -filename "........" -url http://hostname -force
-globalinstall

IISRESET

This will put the web  part in the GAC

Previous I done the same thing.