C#

// I AM TRYING TO WRITE AND CREATE A FILE, USING ONLY ONE BIT AT A TIME.
// I AM WRITING THE FILE, BUT NOTHING GOES IN.
// ALSO I GETTING ERRORS FOR BEING OUTSIDE OF THE ARRAY.
using System;
using System.IO;
using System.Collections;
namespace Applica
{
    static class Program
    {
        static void Main(string[] args)
        {
            bool tif = true;
            byte[] buffer = BitConverter.GetBytes(tif);
            FileInfo ap = new FileInfo("tempii.txt");
            string filePath = ap.FullName;
            string destinationPath = Path.Combine("C:\\check", Path.GetFileName(filePath));
            using (Stream output = File.OpenWrite(destinationPath))
            {
                int bits = 32;
                while (bits > 0)
                {
                    for (int i = 1; i < 33; i++)//4 random bytes
                    {
                        if (tif == true)
                        {
                            tif = false;
                            goto A;
                        }
                        if (tif == false) tif = true;
                        A:;
                        output.Write(buffer, 0, bits);
                    }
                }
            }
        }
    }
}

public static void GetAllUsers()
{
    PrincipalContext AD = new PrincipalContext(ContextType.Domain, serverName);
    UserPrincipal u = new UserPrincipal(AD);
    PrincipalSearcher search = new PrincipalSearcher(u);

    foreach (UserPrincipal result in search.FindAll().OrderBy(x => x.DisplayName))
    {
        if (!string.IsNullOrEmpty(result.DisplayName))
        {
            Console.WriteLine(result.DisplayName);
        }
    }
    Console.ReadLine();
}

public void AlphaNumericString()
       {

           //string value;
           string s = BacBox.Text;
           int maxLenght = 4;

           Regex r = new Regex("^[a-zA-Z0-9]*$");
           if (r.IsMatch(s))
           {
               for (int i = 0; i = maxLenght; i++)
               {

                   BacBox.Text = s;
               }

           }
           else
           {
               MessageBox.Show("Enter 4 alphanumeric characters only");
           }

Console.WriteLine(fi.Name);

cmd.Parameters.AddWithValue("@FileName", fi.Name);

static void Main(string[] args)
        {
            DriveInfo di = new DriveInfo(@"C:\");
            string conString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=e:\\mydbtry.accdb";
            OleDbConnection con = new OleDbConnection();
            OleDbCommand cmd = new OleDbCommand();
            
            con.ConnectionString = conString;
            con.Open();
                        
            DirectoryInfo dirInfo = di.RootDirectory;         
            FileInfo[] fileNames = dirInfo.GetFiles("*.*");  // Store all "root" file names in Array

            foreach (FileInfo fi in fileNames)              
            {

                cmd.CommandText = "Insert into Table1 (FileName) Values (@FileName)"; 

                cmd.Parameters.AddWithValue("@FileName", fi.Name);

                cmd.Connection = con;
                cmd.ExecuteNonQuery();

                Console.WriteLine(fi.Name);  // Verify via Console window that the "fi" variable really is changing
                
            }

            con.Close();

            Console.WriteLine("Finished.");
            Console.ReadKey();
        }