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AANGELOV/ConfigModificator/CSharp/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
+    </startup>
+  <appSettings>
+    <add key="testKey " value="1" />
+    <add key="testKey1" value="myTestValue" />
+  </appSettings>
+</configuration>

AANGELOV/ConfigModificator/CSharp/Cars.xml

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+<?xml version="1.0" encoding="utf-8" ?>
+<testsConfiguration>
+  <cars>
+    <car name="Audi" price="10000" color="Red"/>
+    <car name="BMW" price="20000" color="White"/>
+  </cars>  
+</testsConfiguration>

AANGELOV/ConfigModificator/CSharp/ConfigModificator.cs

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+using System;
+using System.Configuration;
+using System.Reflection;
+using System.Xml;
+
+namespace AAngelov.Utilities.Configuration
+{
+    /// <summary>
+    /// Contains static methods for settings file modification
+    /// </summary>
+    public static class ConfigModificator
+    {
+        /// <summary>
+        /// Writes the setting.
+        /// </summary>
+        /// <param name="key">The key.</param>
+        /// <param name="value">The value.</param>
+        /// <param name="configWriterSettings">The configuration writer settings.</param>
+        /// <exception cref="System.InvalidOperationException">appSettings section not found in config file.</exception>
+        public static void WriteSetting(string key, string value, ConfigModificatorSettings configWriterSettings)
+        {
+            XmlDocument doc = ConfigModificator.LoadConfigDocument(configWriterSettings.ConfigPath);
+            // retrieve appSettings node
+            XmlNode rootNode = doc.SelectSingleNode(configWriterSettings.RootNode);
+
+            if (rootNode == null)
+            {
+                throw new InvalidOperationException("appSettings section not found in config file.");
+            }
+
+            try
+            {
+                // select the 'note for edit' element that contains your key
+                XmlElement elem = (XmlElement)rootNode.SelectSingleNode(string.Format(configWriterSettings.NodeForEdit, key));
+                elem.FirstChild.InnerText = value;
+                doc.Save(configWriterSettings.ConfigPath);
+            }
+            catch
+            {
+                throw;
+            }
+        }
+
+        /// <summary>
+        /// Changes the value by key.
+        /// </summary>
+        /// <param name="key">The key.</param>
+        /// <param name="value">The value.</param>
+        /// <param name="attributeForChange">The attribute for change.</param>
+        /// <param name="configWriterSettings">The configuration writer settings.</param>
+        /// <exception cref="System.InvalidOperationException">appSettings section not found in config file.</exception>
+        public static void ChangeValueByKey(string key, string value, string attributeForChange, ConfigModificatorSettings configWriterSettings)
+        {
+            XmlDocument doc = ConfigModificator.LoadConfigDocument(configWriterSettings.ConfigPath);
+            // retrieve the root node
+            XmlNode rootNode = doc.SelectSingleNode(configWriterSettings.RootNode);
+
+            if (rootNode == null)
+            {
+                throw new InvalidOperationException("the root node section not found in config file.");
+            }
+
+            try
+            {
+                // select the element that contains the key
+                XmlElement elem = (XmlElement)rootNode.SelectSingleNode(string.Format(configWriterSettings.NodeForEdit, key));
+                elem.SetAttribute(attributeForChange, value);
+                doc.Save(configWriterSettings.ConfigPath);
+            }
+            catch (Exception ex)
+            {
+                throw ex;
+            }
+        }
+
+        /// <summary>
+        /// Loads the configuration document.
+        /// </summary>
+        /// <param name="configFilePath">The configuration file path.</param>
+        /// <returns></returns>
+        /// <exception cref="System.Exception">No configuration file found.</exception>
+        private static XmlDocument LoadConfigDocument(string configFilePath)
+        {
+            XmlDocument doc = null;
+            try
+            {
+                doc = new XmlDocument();
+                doc.Load(configFilePath);
+                return doc;
+            }
+            catch (System.IO.FileNotFoundException e)
+            {
+                throw new Exception("No configuration file found.", e);
+            }
+        }
+
+        /// <summary>
+        /// Refreshes the application settings.
+        /// </summary>
+        public static void RefreshAppSettings()
+        {
+            ConfigurationManager.RefreshSection("appSettings");
+        }
+    }   
+}

AANGELOV/ConfigModificator/CSharp/ConfigModificatorSettings.cs

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+using System;
+
+namespace AAngelov.Utilities.Configuration
+{
+    /// <summary>
+    /// Contains Config Writer Setting Properties
+    /// </summary>
+    public class ConfigModificatorSettings
+    {
+        /// <summary>
+        /// Gets or sets the application settings node.
+        /// </summary>
+        /// <value>
+        /// The application settings node.
+        /// </value>
+        public string RootNode { get; set; }
+
+        /// <summary>
+        /// Gets or sets the node for edit.
+        /// </summary>
+        /// <value>
+        /// The node for edit.
+        /// </value>
+        public string NodeForEdit { get; set; }
+
+        /// <summary>
+        /// Gets or sets the configuration path.
+        /// </summary>
+        /// <value>
+        /// The configuration path.
+        /// </value>
+        public string ConfigPath { get; set; }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ConfigModificatorSettings"/> class.
+        /// </summary>
+        /// <param name="appSettingsNode">The application settings node.</param>
+        /// <param name="nodeForEdit">The node for edit.</param>
+        /// <param name="configPath">The configuration path.</param>
+        public ConfigModificatorSettings(String appSettingsNode, String nodeForEdit, string configPath)
+        {
+            this.RootNode = appSettingsNode;
+            this.NodeForEdit = nodeForEdit;
+            this.ConfigPath = configPath;
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ConfigModificatorSettings"/> class.
+        /// </summary>
+        /// <param name="appSettingsNode">The application settings node.</param>
+        /// <param name="configPath">The configuration path.</param>
+        public ConfigModificatorSettings(String appSettingsNode, string configPath)
+        {
+            this.RootNode = appSettingsNode;
+            this.ConfigPath = configPath;
+        }
+    }
+}

AANGELOV/ConfigModificator/CSharp/Program.cs

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+using AAngelov.Utilities.Configuration;
+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace TestConfigModificator.Console
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            //Example how to change app.config file associated to your application. 
+            //You can use the same approach for web.configs and other type of configurations
+            string appConfigFilePath = string.Concat(Assembly.GetExecutingAssembly().Location, ".config");
+            ConfigModificatorSettings appConfigWriterSettings = 
+                new ConfigModificatorSettings("//appSettings", "//add[@key='{0}']", appConfigFilePath);
+
+            string value = ConfigurationManager.AppSettings["testKey1"];
+            System.Console.WriteLine("Value before modification: {0}", value);
+
+            ConfigModificator.ChangeValueByKey(
+                                                key: "testKey1", 
+                                                value: "ChangedValueByModificator", 
+                                                attributeForChange: "value", 
+                                                configWriterSettings: appConfigWriterSettings);
+
+            ConfigModificator.RefreshAppSettings();
+            value = ConfigurationManager.AppSettings["testKey1"];
+            System.Console.WriteLine("Value after modification: {0}", value);
+
+            //Example how to change Custom XML configuration
+            string carsConfigFilePath = "Cars.xml";
+            ConfigModificatorSettings carsConfigWriterSettings = 
+                new ConfigModificatorSettings("//cars", "//car[@name='{0}']", carsConfigFilePath);
+
+            ConfigModificator.ChangeValueByKey(
+                                               key: "BMW",
+                                               value: "Mazda",
+                                               attributeForChange: "name",
+                                               configWriterSettings: carsConfigWriterSettings);
+        }
+    }
+}

AANGELOV/ConfigModificator/VBNET/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
+    </startup>
+  <appSettings>
+    <add key="testKey " value="1" />
+    <add key="testKey1" value="myTestValue" />
+  </appSettings>
+</configuration>

AANGELOV/ConfigModificator/VBNET/Cars.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<testsConfiguration>
+  <cars>
+    <car name="Audi" price="10000" color="Red"/>
+    <car name="BMW" price="20000" color="White"/>
+  </cars>  
+</testsConfiguration>

AANGELOV/ConfigModificator/VBNET/ConfigModificator.vb

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+Imports System.Configuration
+Imports System.Reflection
+Imports System.Xml
+
+Namespace AAngelov.Utilities.Configuration
+	''' <summary>
+	''' Contains static methods for settings file modification
+	''' </summary>
+	Public NotInheritable Class ConfigModificator
+		Private Sub New()
+		End Sub
+		''' <summary>
+		''' Writes the setting.
+		''' </summary>
+		''' <param name="key">The key.</param>
+		''' <param name="value">The value.</param>
+		''' <param name="configWriterSettings">The configuration writer settings.</param>
+		''' <exception cref="System.InvalidOperationException">appSettings section not found in config file.</exception>
+		Public Shared Sub WriteSetting(key As String, value As String, configWriterSettings As ConfigModificatorSettings)
+			Dim doc As XmlDocument = ConfigModificator.LoadConfigDocument(configWriterSettings.ConfigPath)
+			' retrieve appSettings node
+			Dim rootNode As XmlNode = doc.SelectSingleNode(configWriterSettings.RootNode)
+
+			If rootNode Is Nothing Then
+				Throw New InvalidOperationException("appSettings section not found in config file.")
+			End If
+
+			Try
+				' select the 'note for edit' element that contains your key
+				Dim elem As XmlElement = DirectCast(rootNode.SelectSingleNode(String.Format(configWriterSettings.NodeForEdit, key)), XmlElement)
+				elem.FirstChild.InnerText = value
+				doc.Save(configWriterSettings.ConfigPath)
+			Catch
+				Throw
+			End Try
+		End Sub
+
+		''' <summary>
+		''' Changes the value by key.
+		''' </summary>
+		''' <param name="key">The key.</param>
+		''' <param name="value">The value.</param>
+		''' <param name="attributeForChange">The attribute for change.</param>
+		''' <param name="configWriterSettings">The configuration writer settings.</param>
+		''' <exception cref="System.InvalidOperationException">appSettings section not found in config file.</exception>
+		Public Shared Sub ChangeValueByKey(key As String, value As String, attributeForChange As String, configWriterSettings As ConfigModificatorSettings)
+			Dim doc As XmlDocument = ConfigModificator.LoadConfigDocument(configWriterSettings.ConfigPath)
+			' retrieve the root node
+			Dim rootNode As XmlNode = doc.SelectSingleNode(configWriterSettings.RootNode)
+
+			If rootNode Is Nothing Then
+				Throw New InvalidOperationException("the root node section not found in config file.")
+			End If
+
+			Try
+				' select the element that contains the key
+				Dim elem As XmlElement = DirectCast(rootNode.SelectSingleNode(String.Format(configWriterSettings.NodeForEdit, key)), XmlElement)
+				elem.SetAttribute(attributeForChange, value)
+				doc.Save(configWriterSettings.ConfigPath)
+			Catch ex As Exception
+				Throw ex
+			End Try
+		End Sub
+
+		''' <summary>
+		''' Loads the configuration document.
+		''' </summary>
+		''' <param name="configFilePath">The configuration file path.</param>
+		''' <returns></returns>
+		''' <exception cref="System.Exception">No configuration file found.</exception>
+		Private Shared Function LoadConfigDocument(configFilePath As String) As XmlDocument
+			Dim doc As XmlDocument = Nothing
+			Try
+				doc = New XmlDocument()
+				doc.Load(configFilePath)
+				Return doc
+			Catch e As System.IO.FileNotFoundException
+				Throw New Exception("No configuration file found.", e)
+			End Try
+		End Function
+
+		''' <summary>
+		''' Refreshes the application settings.
+		''' </summary>
+		Public Shared Sub RefreshAppSettings()
+			ConfigurationManager.RefreshSection("appSettings")
+		End Sub
+	End Class
+End Namespace