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Hi Vincent, This solutions is the best to remove modifications maded to web.config. I tried to do it using the SPWebConfigModification object properly configured but I didn't get it. Thanks to your post to bring me the light.

Could you give me some help??? This is my scenario: I'm adding three lines to SafeControl collection and two lines to appSettings section. This works fine without problems. Next, I want to uninstall them and using your code only removes the lines from SafeControl, appSettings is not modified and I have to remove them manually. Do you know if there are problems with appSettings section??? Thanks!

Could you give me some help??? This is my scenario: I'm adding three lines to SafeControl collection and two lines to appSettings section. This works fine without problems. Next, I want to uninstall them and using your code only removes the lines from SafeControl, appSettings is not modified and I have to remove them manually. Do you know if there are problems with appSettings section??? Thanks!

Alright, I got it thanks to my workmate. It was a character forbidden which made that the appSettings lines couldn't be removed. It is solved.

Glad you got it to work. --Vince

I'm running the exact code above trying to remove entries I've previously added in the '/configuration/system.web/compilation/assemblies' section. It doesn't appear to work. I've heard rumours before that there are issues using the SPWebConfigModification class when modifying this section. Has anyone else had or heard of any similar issues?

I'm running the exact code above trying to remove entries I've previously added in the '/configuration/system.web/compilation/assemblies' section. It doesn't appear to work. I've heard rumours before that there are issues using the SPWebConfigModification class when modifying this section. Has anyone else had or heard of any similar issues?

Great solution Vincent! I consider this a best practice.

Vincent Rothwell, I am trying to add and remove web.config entry from several times; I also focused your way; but there is no result. I can add web.config entry successfully. But if I try to remove my entry, I can’t, I debug through the code and its showing successful smile and web.config file is also reloaded after a modification. But the entry is not removed. I can remove attribute of a node, but I can’t remove child node. It’s necessary to entry in system.web/httpHandlers in this path and also required to remove from that location. Is there any way to remove web.config entry? Thanks Tareqe

Tareqe, Is it possible that there are other entries which are adding the entry...it is possible to have several entries which add the same node and if you failed to remove one it may still be there. Have a look at this...http://blog.thekid.me.uk/archive/2007/03/24/web-config-modification-manager-for-sharepoint.aspx...it will show you all the modifications that are being made to web.config.

Removal is not working for Safecontrol entries... Please find the code below SPWebApplication myWebApp = site.WebApplication; Collection<SPWebConfigModification> collection = myWebApp.WebConfigModifications; int iStartCount = collection.Count; // Remove any modifications that were originally created by the owner. for (int c = iStartCount - 1; c >= 0; c--) { SPWebConfigModification configMod = collection[c]; if (configMod.Owner == "Test1") myWebApp.WebConfigModifications.Remove(configMod); } // Apply changes only if any items were removed. if (iStartCount > collection.Count) { myWebApp.Update(); myWebApp.Farm.Services.GetValue<SPWebService>().ApplyWebConfigModifications(); } Code For Adding... SPWebApplication webApp = site.WebApplication; // Create a modification SPWebConfigModification Test= new SPWebConfigModification(); Test.Name = "add[@name='Test']"; Test.Path = "/configuration/SharePoint/SafeControls"; Test.Owner = "Test1"; Test.Sequence = 0; Test.Type = SPWebConfigModification.SPWebConfigModificationType.EnsureChildNode; Test.Value = @"<SafeControl Assembly=Test, Version=1.1.0.0, Culture=neutral, PublicKeyToken=2ed8dda03fe564cd' Namespace='Test' TypeName='*' Safe='True' />"; // Add the modification to the collection of modifications webApp.WebConfigModifications.Add(Test); // Apply the modification webApp.Farm.Services.GetValue<SPWebService>().ApplyWebConfigModifications(); // Serialize the web application state and propagate changes across the farm. webApp.Update(); Please let me know if there is any problem with my code. i am trying to do this in my feature activated and feature deactivated. Addition of safe control entries works well for me, But the problem is that it keeps on adding the SafeControl entries and on feature deactivation they are not getting removed. Thanks, Bharat

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That’s great, I never thought about Removing web.config entries from SharePoint using SPWebConfigModification like that before.

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thanks for your work but please answer people those couldn't make it work.. like me:( If I added this twice all the application got damaged. <remove name="PublishingHttpModule" /> so I want to remove it before adding it. or just adding it once.. please advice.

Hi Jaime López, I see that you added few safetags and appSettings tags in the web.config file , i used your code to do that --> SPWebApplication webApp = site.WebApplication; // Create a modification SPWebConfigModification Test= new SPWebConfigModification(); Test.Name = "add[@name='Test']"; Test.Path = "/configuration/SharePoint/SafeControls"; Test.Owner = "Test1"; Test.Sequence = 0; Test.Type = SPWebConfigModification.SPWebConfigModificationType.EnsureChildNode; Test.Value = @"<SafeControl Assembly=Test, Version=1.1.0.0, Culture=neutral, PublicKeyToken=2ed8dda03fe564cd' Namespace='Test' TypeName='*' Safe='True' />"; // Add the modification to the collection of modifications webApp.WebConfigModifications.Add(Test); // Apply the modification webApp.Farm.Services.GetValue<SPWebService>().ApplyWebConfigModifications(); // Serialize the web application state and propagate changes across the farm. webApp.Update(); Expression must evaluate to a node-set. but when i try to activate the feature i see "Expression must evaluate to a node-set." error , please help me out in this issue

Hi Jaime López, Can you please send me those few lines of code by which you could add added few safetags and appSettings tags in the web.config file ? I will be very thanks full to it.

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I read on some blogs and use this way to custom web.config, but it does not change anything public override void FeatureDeactivating(SPFeatureReceiverProperties properties) { SPSite currentSite = properties.Feature.Parent as SPSite; SPWebApplication _chosenWebApp = currentSite.WebApplication; currentSite.RootWeb.Update(); RemoveWebConfigEntries(_chosenWebApp, "ModifyWebConfig"); } protected void RemoveWebConfigEntries(SPWebApplication oWebApp, string owner) { Collection<SPWebConfigModification> oCollection = oWebApp.WebConfigModifications; int iStartCount = oCollection.Count; for (int c = iStartCount - 1; c >= 0; c--) { SPWebConfigModification oModification = oCollection[c]; if (oModification.Owner == owner) oCollection.Remove(oModification); } if (iStartCount > oCollection.Count) { oWebApp.Update(); SPFarm.Local.Services.GetValue<SPWebService>().ApplyWebConfigModifications(); } }

I read on some blogs and use this way to custom web.config, but it does not change anything public override void FeatureDeactivating(SPFeatureReceiverProperties properties) { SPSite currentSite = properties.Feature.Parent as SPSite; SPWebApplication _chosenWebApp = currentSite.WebApplication; currentSite.RootWeb.Update(); RemoveWebConfigEntries(_chosenWebApp, "ModifyWebConfig"); } protected void RemoveWebConfigEntries(SPWebApplication oWebApp, string owner) { Collection<SPWebConfigModification> oCollection = oWebApp.WebConfigModifications; int iStartCount = oCollection.Count; for (int c = iStartCount - 1; c >= 0; c--) { SPWebConfigModification oModification = oCollection[c]; if (oModification.Owner == owner) oCollection.Remove(oModification); } if (iStartCount > oCollection.Count) { oWebApp.Update(); SPFarm.Local.Services.GetValue<SPWebService>().ApplyWebConfigModifications(); } }

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Initially I also faced problem in removeing the SPWebconfig modifications from the config file. But the follwing link helped me ----- http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.administration.spwebconfigmodification.aspx ---- as per this the name should be parsed based on the value property. Worth to give a try.

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Hi, thanks for the great post!! what I wanted to know was that, how you will remove some entries for which you are not owner or the entries which are added by sharepoint itself in web.config?