Programm_Wirl/AA-Forms/FormLogin.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Security.Cryptography;
using DatenDB;
using System.Threading;
using System.Diagnostics;

namespace Deckungsbeitrag
{
	public partial class FormLogin : Form
	{
    string progFiles = @"C:\Program Files\Common Files\Microsoft Shared\ink";
		string keyboardPath;

    public FormLogin()
		{
			InitializeComponent();

		}

		private void buttonAnmelden_Click(object sender, EventArgs e)
		{
      if(string.IsNullOrWhiteSpace(this.textBoxPasswort.Text)) textBoxBenutzer_Leave(sender, e);
      try
			{
        MD5 md5 = MD5.Create();
				byte[] md5hash = md5.ComputeHash(Encoding.UTF8.GetBytes(this.textBoxPasswort.Text));
				string pwdHash = string.Empty;
				foreach (byte b in md5hash) pwdHash += b.ToString("x2");

				this.Person = Benutzer.Get(this.textBoxBenutzer.Text, pwdHash);
				this.Person.Save();

        this.DialogResult = DialogResult.OK;
				this.Close();
			}
			catch (LoginException lex)
			{
				switch (lex.ErrorCode)
				{
					case -1:
						MessageBox.Show(lex.Message, "Fehler", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
						this.buttonRegistrieren.Visible = false;
						break;
					case -2:
						MessageBox.Show(lex.Message, "Fehler", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
						this.buttonRegistrieren.Visible = false;
						break;
					case -3:
						MessageBox.Show(lex.Message, "Registrieren", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
						this.buttonRegistrieren.Visible = true;
						this.buttonAnmelden.Enabled = false;
						this.groupBox1.Height = 146;
						this.Height = 265;
						this.labelPwdWh.Visible = true;
						this.textBoxPwdWh.Visible = true;
						break;
					case -4:
						MessageBox.Show(lex.Message, "Server Fehler", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
						break;
					default:
						break;
				}

			}
			catch (Exception ex)
			{
				MessageBox.Show(ex.Message, "Fehler", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
			}

			CloseKeyboard();
    }
		private void CloseKeyboard()
		{
      foreach (var process in Process.GetProcessesByName("TabTip"))
      {
        try
        {
          process.Close();
        }
        catch (Exception es)
        {
          // Fehlerbehandlung falls Prozess nicht beendet werden kann
          MessageBox.Show($"Fehler beim Schließen: " + es.Message);
        }
      }

    }
    private void buttonAbbrechen_Click(object sender, EventArgs e)
		{
			this.DialogResult = DialogResult.Cancel;
			this.Close();
		}

		public Benutzer Person { get; set; }
    private void buttonRegistrieren_Click(object sender, EventArgs e)
		{
			if (!String.IsNullOrEmpty(this.textBoxBenutzer.Text) && !String.IsNullOrEmpty(this.textBoxPasswort.Text) && this.textBoxPasswort.Text == this.textBoxPwdWh.Text)
			{
				Benutzer person = Benutzer.GetBenutzer(this.textBoxBenutzer.Text, null);
				//person.BenutzerName = this.textBoxBenutzer.Text;
				MD5 md5 = MD5.Create();
				byte[] md5hash = md5.ComputeHash(Encoding.UTF8.GetBytes(this.textBoxPasswort.Text));
				string pwdHash = string.Empty;
				foreach (byte b in md5hash) pwdHash += b.ToString("x2");
				person.Passwort = pwdHash;

				if (person.Save() == 1)
				{
					this.groupBox1.Height = 100;
					this.Height = 222;
					this.labelPwdWh.Visible = false;
					this.textBoxPwdWh.Visible = false;
					this.buttonRegistrieren.Visible = false;
					this.textBoxPasswort.Text = this.textBoxPwdWh.Text = string.Empty;
					MessageBox.Show($"Benutzer {this.textBoxBenutzer.Text} wurde erfolgreich angelegt!", "Hinweis", MessageBoxButtons.OK, MessageBoxIcon.Information);
					this.buttonAnmelden.Enabled = true;
				}
			}
		}

    private void textBoxBenutzer_Leave(object sender, EventArgs e)
    {
			if (textBoxBenutzer.Text.Contains(";"))
			{
				this.textBoxPasswort.Text = this.textBoxBenutzer.Text.Substring(this.textBoxBenutzer.Text.IndexOf(";") + 1);
				this.textBoxBenutzer.Text = this.textBoxBenutzer.Text.Substring(0, this.textBoxBenutzer.Text.IndexOf(";"));
			}
    }


    private void FormLogin_Load(object sender, EventArgs e)
    {
      this.groupBox1.Height = 110;
      this.labelPwdWh.Visible = false;
      this.textBoxPwdWh.Visible = false;
      this.buttonRegistrieren.Visible = false;

			this.textBoxBenutzer.Focus();

      WindowState = FormWindowState.Normal;
			StartPosition = FormStartPosition.CenterScreen;
    }

    private void FormLogin_Shown(object sender, EventArgs e)
    {
      StartPosition = FormStartPosition.CenterScreen;
    }

    private void textBoxBenutzer_Enter(object sender, EventArgs e)
    {
      // Pfad zur Touch-Tastatur
      keyboardPath = System.IO.Path.Combine(progFiles, "TabTip.exe");

      // Bildschirmtastatur starten
      Process.Start(keyboardPath);
    }

    private void textBoxPasswort_Enter(object sender, EventArgs e)
    {
      // Pfad zur Touch-Tastatur
      keyboardPath = System.IO.Path.Combine(progFiles, "TabTip.exe");

      // Bildschirmtastatur starten
      Process.Start(keyboardPath);
    }
		private void textBox_Leave(object sender, EventArgs e)
		{
			CloseKeyboard();
    }
  }
}