Write in app.config file in C#

Question

Hi,

I am developing a Window Application in VS2008.

Can anyone tell me how to write /modify the app.config value programmatic-ally for a specific key ?

I have tried searching the internet but getting solutions for Web application not for Window Application.

Thanks in Advance for kind help.

Ankur Gupta · Answer

You can use this function to save permanent value in Config file... public static void WriteSetting(string key, string value) { ////load config document for current assembly XmlDocument doc = loadConfigDocument(); // retrieve appSettings node XmlNode node = doc.SelectSingleNode("//appSettings"); if (node == null) { throw new InvalidOperationException("appSettings section not found in config file."); } try { // select the 'add' element that contains the key XmlElement elem = (XmlElement)node.SelectSingleNode(string.Format("//add[@key='{0}']", key)); if (elem != null) { // add value for key elem.SetAttribute("value", value); } else { // key was not found so create the 'add' element // and set it's key/value attributes elem = doc.CreateElement("add"); elem.SetAttribute("key", key); elem.SetAttribute("value", value); node.AppendChild(elem); } doc.Save(getConfigFilePath()); } catch { throw; } } public static XmlDocument loadConfigDocument() { XmlDocument doc = null; try { doc = new XmlDocument(); doc.Load(getConfigFilePath()); return doc; } catch (System.IO.FileNotFoundException e) { throw new Exception("No configuration file found.", e); } } public static string getConfigFilePath() { return Assembly.GetExecutingAssembly().Location + ".config"; } Also you can read my artical on this site about all of this.

Ankur Gupta · Answer

The following function can Save value in config file........ public static void SaveSetting(string ConnectionString1) { System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); config.AppSettings.Settings.Remove("SqlConnectionADODB"); config.AppSettings.Settings.Add("SqlConnectionADODB", ConnectionString1); config.Save(); ConfigurationManager.RefreshSection("appSettings"); }

Crish · Answer

hi You can edit windows App.config file. hope below link give your solution. http://www.codeproject.com/KB/cs/SystemConfiguration.aspx thanks Don't forget to Mark Do you like this Answer that solved your problem!