.NET Settings Relative Path

public string ExecutingAssemblyPath()
{
   Assembly actualAssembly = Assembly.GetEntryAssembly();
   if (this.actualAssembly == null)
   {
      actualAssembly = Assembly.GetCallingAssembly();
   }
   return actualAssembly.Location;
}

string absolutePath = Settings.Default.ImagePath;
if(!Path.IsPathRooted(absolutePath))
{
    string root = Assembly.GetEntryAssembly().Location;
    root = Path.GetDirectoryName(root);
    absolutePath = Path.Combine(root, absolutePath);
}

new System.IO.FileInfo(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile).Directory;

Application.StartupPath

public static string RealAssemblyFilePath()
{
   string dllPath=Assembly.GetExecutingAssembly().CodeBase.Substring(8);
   return dllPath;
}

public static IEnumerable<DirectoryInfo> ParentDirs(this DirectoryInfo dir) {
    while (dir != null) {
        yield return dir;
        dir = dir.Parent;
    }
}
public static DirectoryInfo FindDataDir(string relpath, Assembly assembly) {
    return new FileInfo((assembly).Location)
        .Directory.ParentDirs()
        .Select(dir => Path.Combine(dir.FullName + @"", relpath))
        .Where(Directory.Exists)
        .Select(path => new DirectoryInfo(path))
        .FirstOrDefault();
}