[C#] Open a file for reading but don't lock it

snippet.cs

Stream stream = null;
try
{
    stream = File.Open(Path.Combine(this.applicationPath, fileName), FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
    using (var reader = new StreamReader(stream))
    {
        stream = null;
        return reader.ReadToEnd();
    }
}
finally
{
    if (stream != null)
    {
        stream.Dispose();
    }
}