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CodeElements elements = _applicationObject.ActiveDocument.ProjectItem.FileCodeModel.CodeElements;
foreach (CodeElement element in elements)
{
    if (element.Kind == vsCMElement.vsCMElementNamespace)
    {
         CodeNamespace ns = (CodeNamespace)element;
         MeinEditPoint.Insert("Namespace: " + ns.FullName);
    }
}                    

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#region code to get the namespace
        /// <summary>
        /// get a codeelement which is located at the current cursor position
        /// currently a namespace is searched
        /// </summary>
        /// <returns></returns>
        private string GetCodeElementAtCursor()
        {
            vsCMElement aSearchElement = vsCMElement.vsCMElementNamespace;
            string aResult = string.Empty;
            EnvDTE.CodeElement aObjCodeElement = null;
            EnvDTE.TextPoint aObjCursorTextPoint;
            try
            {
                aObjCursorTextPoint = GetCursorTextPoint();
                if (!(aObjCursorTextPoint == null))
                {
                    aObjCodeElement = GetCodeElementAtTextPoint(aSearchElement, _applicationObject.ActiveDocument.ProjectItem.FileCodeModel.CodeElements, aObjCursorTextPoint);
                }
                if (null != aObjCodeElement)
                {
                    aResult = aObjCodeElement.FullName;
                }
            }
            catch (System.Exception )
            {
                //handle the exception
            }
            return aResult;
        }

        /// <summary>
        /// define the current cursor position
        /// </summary>
        /// <returns></returns>
        private EnvDTE.TextPoint GetCursorTextPoint()
        {
            EnvDTE.TextPoint aObjCursorTextPoint = null;
            try
            {
                aObjCursorTextPoint = ((EnvDTE.TextDocument)((EnvDTE80.DTE2)_applicationObject).ActiveDocument.Object("textdocument")).Selection.ActivePoint;
            }
            catch (System.Exception )
            {
                //handle the exception
            }
            return aObjCursorTextPoint;
        }

        /// <summary>
        /// get the requested code element at the text point
        /// </summary>
        /// <param name="theRequestedCodeElementKind">the code element to get</param>
        /// <param name="theColCodeElements"></param>
        /// <param name="theObjTextPoint">the current text point</param>
        /// <returns></returns>
        private EnvDTE.CodeElement GetCodeElementAtTextPoint(EnvDTE.vsCMElement theRequestedCodeElementKind, EnvDTE.CodeElements theColCodeElements, EnvDTE.TextPoint theObjTextPoint)
        {
            EnvDTE.CodeElement aObjResultCodeElement = null;
            EnvDTE.CodeElements aColCodeElementMembers;
            EnvDTE.CodeElement aObjMemberCodeElement;
            if (!(theColCodeElements == null))
            {
                foreach (EnvDTE.CodeElement aObjCodeElement in theColCodeElements)
                {
                    if (aObjCodeElement.StartPoint.GreaterThan(theObjTextPoint))
                    {
                        //  The code element starts beyond the point
                    }
                    else if (aObjCodeElement.EndPoint.LessThan(theObjTextPoint))
                    {
                        //  The code element ends before the point
                    }
                    else
                    {
                        //  The code element contains the point
                        if ((aObjCodeElement.Kind == theRequestedCodeElementKind))
                        {
                            //  Found
                            aObjResultCodeElement = aObjCodeElement;
                        }
                        //  recursive to get nested
                        aColCodeElementMembers = aObjCodeElement.Children;
                        aObjMemberCodeElement = GetCodeElementAtTextPoint(theRequestedCodeElementKind, aColCodeElementMembers, theObjTextPoint);
                        if (!(aObjMemberCodeElement == null))
                        {
                            aObjResultCodeElement = aObjMemberCodeElement;
                        }
                        break;
                    }
                }
            }
            return aObjResultCodeElement;
        }
#endregion