Edit .properties files

Properties.cs

/**
Property P = new Property();
P.setFileRoute(ROUTE);        --add the path to file
P.setProperty(VALUE, KEY);     --add a property value/name and its value to the file, or if it doesn´t exist, it´ll create a new one with these elements.
P.getPropertyValue(LINE);            --get the value or the key of a line chosen from the file
P.getPropertyKey(LINE);
**/ 

using System;
using System.IO;
namespace NAMESPACE
{
	public class Property
	{
		private string Value, Key, Route;
		private int PropertyLine;
		public void setFileRoute(string Route)
		{
			this.Route = Route;
		}
		public void setProperty(string Value, string Key)
		{
			this.Value = Value;
			this.Key = Key;
			System.IO.StreamReader FL = new System.IO.StreamReader(Route);
			string FULL = FL.ReadToEnd();
			FL.Close();
			StreamWriter SW = new StreamWriter(Route);
			SW.WriteLine('\n'+FULL+'\n'+Value+"="+Key);
			SW.Close();
		}
		public string getPropertyKey(int PropertyLine)
		{
			this.PropertyLine = PropertyLine;
			System.IO.StreamReader FL = new System.IO.StreamReader(Route);
			string FULL = FL.ReadToEnd();
			var SPL1 = FULL.Split('\n');
			string LINE = SPL1[PropertyLine];
			var SPL2 = LINE.Split('=');
			string KEY = SPL2[0];
			FL.Close();
			return KEY;
		}
		public string getPropertyValue(int PropertyLine)
		{
			this.PropertyLine = PropertyLine;
			System.IO.StreamReader FL = new System.IO.StreamReader(Route);
			string FULL = FL.ReadToEnd();
			var SPL1 = FULL.Split('\n');
			string LINE = SPL1[PropertyLine];
			var SPL2 = LINE.Split('=');
			string VALUE = SPL2[1];
			FL.Close();
			return VALUE;
		}
	}
}