无法更新和保存web.config文件

Question

I tried to encrypt the connection string section of the web.config file of a ASP.Net Web application via a simple winforms application. I ran the VS2010 as an administrator and ran the following section of code.

private void encryptButton_Click(object sender, EventArgs e)
        {
            Configuration config = GetConfiguration();
            ConfigurationSection configSection = config.GetSection("connectionStrings");
            if (configSection != null)
                // Only encrypt the section if it is not already protected
                if (!configSection.SectionInformation.IsProtected)
                {
                    configSection.SectionInformation.ProtectSection(
                        "DataProtectionConfigurationProvider");
                    configSection.SectionInformation.ForceSave = true;
                    config.Save();
                    DisplayWebConfig();
                }
        }

private Configuration GetConfiguration() 
        {
            var configFile = new FileInfo(@"C:\Users\abalawan\Desktop\CN\R13 new\Websites\ABC");
            var vdm = new VirtualDirectoryMapping(configFile.DirectoryName,true,configFile.Name);
            var wcfm = new WebConfigurationFileMap();
            wcfm.VirtualDirectories.Add("/",vdm);
            return WebConfigurationManager.OpenMappedWebConfiguration(wcfm, "/");
        }

As I had only the physical path I tried to map the path accordingly to a virtual path. But config.Save() is throwing me the following error

ConfigurationErrorsException was unhandled.

Unable to save config to file 'C:\Users\abalawan\Desktop\CN\R13 new\Websites\ABC'.

Just for the sake of clarity this is how the StackTrace looks like

 at System.Configuration.Internal.WriteFileContext.ReplaceFile(String Source, String Target)
   at System.Configuration.Internal.WriteFileContext.Complete(String filename, Boolean success)
   at System.Configuration.Internal.InternalConfigHost.StaticWriteCompleted(String streamName, Boolean success, Object writeContext, Boolean assertPermissions)
   at System.Configuration.Internal.InternalConfigHost.System.Configuration.Internal.IInternalConfigHost.WriteCompleted(String streamName, Boolean success, Object writeContext, Boolean assertPermissions)
   at System.Configuration.Internal.InternalConfigHost.System.Configuration.Internal.IInternalConfigHost.WriteCompleted(String streamName, Boolean success, Object writeContext)
   at System.Configuration.Internal.DelegatingConfigHost.WriteCompleted(String streamName, Boolean success, Object writeContext)
   at System.Configuration.UpdateConfigHost.WriteCompleted(String streamName, Boolean success, Object writeContext)
   at System.Configuration.MgmtConfigurationRecord.SaveAs(String filename, ConfigurationSaveMode saveMode, Boolean forceUpdateAll)
   at System.Configuration.Configuration.SaveAsImpl(String filename, ConfigurationSaveMode saveMode, Boolean forceSaveAll)
   at System.Configuration.Configuration.Save()
   at EncryptionandDecryptionApplication.Form1.encryptButton_Click(Object sender, EventArgs e) in C:\Users\abalawan\Desktop\CN\EncryptionandDecryptionApplication\EncryptionandDecryptionApplication\Form1.cs:line 55
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.Run(Form mainForm)
   at EncryptionandDecryptionApplication.Program.Main() in C:\Users\abalawan\Desktop\CN\EncryptionandDecryptionApplication\EncryptionandDecryptionApplication\Program.cs:line 18
   at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

Answer 1

your code is perfect. There seems to be permission issue. Just for time being try giving full access to your file location to everyone. If it works then its the permission issue(Though giving full permission to everyone isn't a good idea )

If you want to add UAC permission in your application then you can add app.manifest file and in that file changes the requestedExecutionLevel tag as below:

    <requestedExecutionLevel level="requireAdministrator" uiAccess="false" />