c# winform active directory: acces to another form if login succes

Question

i want to create a control from a form where i have login textbox and password textbox, and login button. when i will enter the active directory account name and its password i

Answer 1

this is the code of my app :

  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 LibXmlSettings.Settings;
    using Microsoft.ApplicationBlocks.Data;
    using System.Data.Sql;
    using System.Data.SqlClient;
    using System.Data.SqlTypes;
    using System.DirectoryServices;
    using System.IO;
    using System.Linq.Expressions;
    using System.Runtime.InteropServices;

    using System.DirectoryServices.AccountManagement;

    namespace GestionnaireDesPlugins
public partial class Login : Form
    {
        public Login(string accountName, string accountPassword)
        {
            InitializeComponent();
        }

        private void btnLogin_Click(object sender, EventArgs e)
        {

            using (var context = new PrincipalContext(ContextType.Domain, "Domain"))
                {
                    using (var searcher = new PrincipalSearcher(new UserPrincipal(context)))
                    {
                        foreach (var result in searcher.FindAll())
                        {
                            DirectoryEntry de = result.GetUnderlyingObject() as DirectoryEntry;
                           comboBox1.Items.Add(de.Properties["samAccountName"].Value);
                           comboBox1.Sorted = true;
                        }
                    }
                }
 // Check if the user haven't chosen an account
   if (comboBox1.Text == "") { return; }

   // Check if the password TextBox is empty
   if (textBox1.Text == "") { return; }

   // Create a new method for checking the account and password, which returns a bool
   bool loginSuccess = CheckUserInput(comboBox1.Text.Trim(), textBox1.Text);

   if (loginSuccess)
   {
      // Create a new instance of your user-interface form. Give the account name and password
      // to it's constructor
      UserForm newForm = new UserForm(comboBox1.Text.Trim(), textBox1.Text.Trim()))

      // Show the created UserForm form
      newForm.Show();

      // Close this login form
      this.Close();
   }
}
}