Windows Form TextBox User input

Question

I'm new to windows forms and have never tried it before, i mainly do razorpages and stuff along those lines.

I'm making a form that is suppose to create an account. i have a Class account with a bunch of properties already, the problem is that i can't seem to figure out how i make whatever is written in the textboxes = my Account properties.

I've tried making properties in the form and initializing them to my account properties liek this Firstname = Account.FirstName; but i just get "object reference not set to an instance of an object" error when i run it.

public partial class AddAccountDialog : Form
{
#region Properties

        public Account Account { get; set; }
        public string Id { get; set; }
        public string Firstname { get; 
            set; }
        public string Lastname { get; set; }
        public string Username { get; set; }
        public string Password { get; set; }
        private bool Accepted { get; set; }
    
        #endregion
        public AddAccountDialog()
        {
            #region Applying Properties
    
            Id = Account.UserID;
            Firstname = Account.FirstName;
            Lastname = Account.LastName;
            Username = Account.Username;
    
            Accepted = false;
    
    
            #endregion
    
            #region Setup Methods
            InitializeComponent();
            SetupForm();
            ShowDialog();
            #endregion
        }
    
        private void SetupForm()
        {
            
    
        }
    
        private void textBox_user_id_TextChanged(object sender, EventArgs e)
        {
            Id = textBox_user_id.Text;
        }
    
        private void textBox_firstname_TextChanged(object sender, EventArgs e)
        {
            Firstname = textBox_firstname.Text;
        }
    
        private void textBox_lastname_TextChanged(object sender, EventArgs e)
        {
            Lastname = textBox_lastname.Text;
        }
    
        private void textBox_username_TextChanged(object sender, EventArgs e)
        {
            Username = textBox_username.Text;
        }
    
        private void textBox_password_TextChanged(object sender, EventArgs e)
        {
            Password = textBox_password.Text;
        }
    
        private void button_accept_changes_Click(object sender, EventArgs e)
        {
            Accepted = true;
    
            if (textBox_firstname.Text == "" || 
                    textBox_lastname.Text == "" || 
                        textBox_username.Text == "" || 
                            textBox_password.Text == "") { MessageBox.Show("Udfyld alle kasser"); }
            else
            {
                //Account.FirstName = textBox_firstname.Text;
                //Account.LastName = textBox_lastname.Text;
                //Account.Username = textBox_username.Text;
                //Account.UserID = textBox_user_id.Text;
    
                Account = new Account();
    
                Account.ToString();
                //Close();
            }
    
        }
        public Account GetResponse()
        {
            Close();
    
            if (Accepted) return Account;
            else return null;
    
            Dispose();
        }
    }

Account class

 public class Account
    {

        #region Properties

        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string FullName { get { return $"{FirstName} {LastName}"; } }
        public string Username { get; set; }
        public string UserID { get; set; }
        public string[] AllowedPermissionIDS { get; set; }
        public bool IsAdmin { get; set; }
        #endregion
        /// <summary>
        /// 
        /// </summary>

        public Account(string firstName, string lastName, string username, string userId, string[] allowedPermissionIds, bool isAdmin)
        {
            FirstName = firstName;
            LastName = lastName;
            Username = username;
            UserID = userId;
            AllowedPermissionIDS = allowedPermissionIds;
            IsAdmin = isAdmin;
        }
        public Account()
        {
            
        }

Answer 1

Have you tried this in the button_accept_changes_Click event? It is unclear why the code is commented out, but it should go something like…

Account = new Account();

Account.FirstName = textBox_firstname.Text;
Account.LastName = textBox_lastname.Text;
Account.Username = textBox_username.Text;
Account.UserID = textBox_user_id.Text;