C# Write and read config file

app.config

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1. <?xml version="1.0"?>  
2. <configuration>  
3.   <appSettings>  
4.     <add key="oldPlace" value="4" />  
5.   </appSettings>  
6. </configuration>  

Write:

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1. System.Configuration.Configuration config =ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);  
   
2. config.AppSettings.Settings["oldPlace"].Value = "3";       
   
3. config.Save(ConfigurationSaveMode.Modified);  
   
4. ConfigurationManager.RefreshSection("appSettings");  
   

Read:

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1. string value = ConfigurationManager.AppSettings["oldPlace"];