Dynamic App Settings Samples and examples

Here is a Small Example how to write to App.config file for windows application.

This code Changes your app.config file at run time. The location that this sample takes your bin folder project.exe.config.

Ex: if your project name is sample and it it should contain app.config file and this sample writes to the config file that is created in your bin folder.

This code Accepts Parameter
<--appSettings-->
ex: <--add Key="Sample" value=""-->
<--/appSettings-->

1. NewValue - Value to Change (The Value that you want to change for the key>
2. KeyName - The Name of the Key in AppSettings (In the above example we added a key called 'Sample' so, we need to send Sample as KeyName)
3. Settings - The Settings Name the Key Exits(ex: In the above Example our Key is in 'appSettings' so, we need to send appSettings' as Settings)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using Main.App_Code.Common;
using System.Configuration;

class ConfigFileSettings
{

#region Public Methods

public bool WritetoConfigFile(string NewValue,string KeyName,string Settings)
{
string configpath = System.Reflection.Assembly.GetExecutingAssembly().Location + ".config";
if (!(System.IO.File.Exists(configpath)))
throw new Exception("Application Configuration File Not Exists" + Environment.NewLine + "Please Contact Administrator");
WriteAppSet(ref configpath, ref NewValue,ref KeyName,ref Settings);
return true;
}

#endregion

#region Private Methods

private void WriteAppSet(ref string ConfigPath,ref string NewValue,ref string KeyName,ref string Settings)
{
XmlDocument objXml=null;
XmlNode nd = null;
XmlElement el = null;
XmlTextWriter tw = null;
try
{
objXml = new XmlDocument();
objXml.Load(ConfigPath);
nd = objXml.SelectSingleNode("//" + Settings);
if (nd == null)
{
throw new Exception("Please Add "+KeyName+" Key in Application Configuration File");
}
el = (XmlElement)nd.SelectSingleNode("//add[@key='" + KeyName + "']");
if (el != null)
{
el.SetAttribute("value", NewValue);
}
tw = new XmlTextWriter(ConfigPath, null);
tw.Formatting = Formatting.Indented;
objXml.WriteTo(tw);
tw.Flush();
tw.Close();
}
catch (Exception ex)
{
throw ex;
}
finally
{
if (tw != null)
tw = null;
if (el != null)
el = null;
if (nd != null)
nd = null;
if (objXml != null)
objXml = null;
}
}

#endregion

}

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