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					. Net Framework
Many AutoCAD-problems are caused by a compatibility issue between AutoCAD LT and .NET
Framework:

    -    Installation problems.
    -    Problems during launching the software.
    -    Some features, as Layer Manager or Calculator, do not work properly.
    -    While executing a command or selecting one of the UI items, the product crashed with the
         following error message: Unhandled e0434f4dh exception at 7c81eb33h.
    -    …

First check if the correct .NET Framework is installed:
          Info: http://msdn.microsoft.com/en-us/kb/kb00318785.aspx

            AutoCAD LT version:      .NET Framework version:
                 LT 2011                   .NET 3.5 SP1
                 LT 2010                   .NET 3.5 SP1
                 LT 2009                     .NET 3.0
                 LT 2008                     .NET 2.0
                 LT 2007                     .NET 2.0
                 LT 2006                   .NET 1.1 SP1

Removing Microsoft .NET Framework:
Clean-up all unnecessary .NET Framework components, starting with the most recent version.
If problem persisted after standard un-installation routine, then 3rd party removal utilities can be
considered (if necessary).
There are several utilities available for .NET Framework removal. For example:
        http://blogs.msdn.com/astebner/archive/2006/05/30/611355.aspx
         Important notes:
         - These are not Autodesk utilities and usage is at your discretion and considerations
         -   Read each utilities caveats and disclaimers in usage terms and conditions

Typically, such tool will delete shared files and registry keys used by other versions of the .NET
Framework.

A repair or re-install for relevant versions .NET Framework may be required.
        http://www.microsoft.com/downloads/en/results.aspx?freetext=.net&displaylang=en&stype=s_basic


To force AutoCAD to use a compatible version of .NET Framework.
If different versions of AutoCAD LT / .NET Framework are installed side by side this procedure can force
the AutoCAD to use the correct .NET Framework version:
         http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=8221230&linkID=9240817


Man and Machine                                                                                 Annick Noë
Man and Machine   Annick Noë

				
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Description: . NET Framework security solution is based on the concept of managed code, and by the common language runtime (CLR) to enhance the safety rules. Most of the management code need to be validated to ensure the type safety and other pre-defined security attribute behavior. For example, in the validation code, declared 4-byte value for the receiver to refuse to provide access to 8-byte parameter called because it is not type safe. Validation process also ensures the implementation of flow only sent to the known location, such as method entry point - a process to jump to any location in addition to the ability to perform.