Создание текстовых файлов в папке с программой

string filename="file1.txt";
string path = Directory.GetCurrentDirectory();
if (!Directory.Exists(path + "/dir1"))
{
    Directory.CreateDirectory(path + "/dir1");
}
File.Create(path + "/dir1/" + filename);

File.Create(path + "/dir1/" + filename).Close();

using System.IO;

FileStream fs= File.Create(path + "/dir1/" + filename);
StreamWriter writer = new StreamWriter(fs);
writer.Write("какой-то текст"); //что-то пишем
writer.Close();

string filename = "File1.bat";
            string path = Directory.GetCurrentDirectory();
            FileStream fs = File.Create(path + "/completed/" + filename);
            StreamWriter writer = new StreamWriter(fs);
            writer.Write("text");
            writer.Close();

string filename = "File1.bat";
string path = Directory.GetCurrentDirectory();
//или string path = Application.StartupPath;
if (!Directory.Exists(path + "/completed")) //если папки нет - создаем
{
    Directory.CreateDirectory(path + "/completed");
}
FileStream fs = File.Create(path + "/completed/" + filename);
StreamWriter writer = new StreamWriter(fs);
writer.Write("text");
writer.Close();

string completedPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "completed");
Directory.CreateDirectory(completedPath);
string filePath = Path.Combine(completedPath, "File1.bat");
using (StreamWriter writer = new StreamWriter(filePath))
{
    writer.Write("text");
}