File is getting locked on read/write operation in C# - windows

Question

A third party application is reading the output text file of my windows application,it is getting paused.I think,it is happening because of file gets locked either on writing or reading.how can i make this work fine.Please see my code.
List<string> fileList = new List<string>();
System.Timers.Timer timer;
string currentfilename;
string currentcontent;
public Service1()
{
//
timer = new System.Timers.Timer();
timer.AutoReset = false;
timer.Elapsed += new System.Timers.ElapsedEventHandler(DoStuff);
}
void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
throw new NotImplementedException();
}
private void DoStuff(object sender, System.Timers.ElapsedEventArgs e)
{
DateTime LastChecked = DateTime.Now;
try
{
string[] files = System.IO.Directory.GetFiles(#"C:\Journal", "*.jrn", System.IO.SearchOption.AllDirectories);
foreach (string file in files)
{
if (!fileList.Contains(file))
{
currentfilename = file;
fileList.Add(file);
copywarehouse(file);
try
{
string sourcePath = #"C:\Journal";
string sourceFile = System.IO.Path.Combine(sourcePath, file);
using (FileStream fs= new FileStream(sourceFile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
StreamReader sr = new StreamReader(fs);
currentcontent = sr.ReadToEnd();
sr.Close();
}
}
catch (Exception ex)
{
throw (ex);
}
}
}
try
{
string sourcePath1 = #"C:\Journal";
string currentfilecontent;
string sourceFile1 = System.IO.Path.Combine(sourcePath1, currentfilename);
using (FileStream fs = new FileStream(sourceFile1, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
StreamReader sr = new StreamReader(fs);
currentfilecontent = sr.ReadToEnd();
sr.Close();
}
if (currentfilecontent != currentcontent)
{
if (currentfilecontent.Contains(currentcontent))
{
string originalcontent = currentfilecontent.Substring(currentcontent.Length);
File.WriteAllText(#"C:\Journal\tempfile.txt", originalcontent + "\r\n");
using (FileStream fs = new FileStream(#"C:\Journal\tempfile.txt", FileMode.OpenOrCreate))
{
StreamWriter sw = new StreamWriter(fs);
sw.Write(originalcontent);
sw.Close();
}
currentcontent = currentfilecontent;
}
}
}
//}
catch (Exception ex)
{
throw (ex);
}
TimeSpan ts = DateTime.Now.Subtract(LastChecked);
TimeSpan MaxWaitTime = TimeSpan.FromMilliseconds(100);
if (MaxWaitTime.Subtract(ts).CompareTo(TimeSpan.Zero) > -1)
timer.Interval = MaxWaitTime.Subtract(ts).Milliseconds;
else
timer.Interval = 1;
timer.Start();
}
catch (Exception ex)
{
throw (ex);
}
}
private void copywarehouse(string filename)
{
string sourcePath = #"C:\Journal";
string targetPath = #"C:\Journal";
string copycontent=null;
try
{
string sourceFile = System.IO.Path.Combine(sourcePath, filename);
string destFile = System.IO.Path.Combine(targetPath, "tempfile.txt");
using (FileStream fs = new FileStream(sourceFile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
StreamReader sr = new StreamReader(fs);
copycontent = sr.ReadToEnd();
sr.Close();
}
using (FileStream fs = new FileStream(destFile, FileMode.Append))
{
StreamWriter sw = new StreamWriter(fs);
sw.Write(copycontent);
sw.Close();
}
}
catch (Exception ex)
{
throw (ex);
}
}

Answer 1

Here the problem is with third party application which is reading my application output as input.it is not allowing access to more than one file content..