Forms/LoginForm.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Vender
{
    public partial class Login : Form
    {
        public string sellerName;
        DBConnect dBCon = new DBConnect();

        //
        //AdminLogin function
        //
        private void AdminLogin()
        {
            if (TextBoxadminUsername.Text.Equals("") && TextBoxadminUPassword.Text.Equals(""))
            {
                LabelErrorAdmin.Text = ("Enter username and password");
            }
            else if (TextBoxadminUsername.Text == "")
            {
                LabelErrorAdmin.Text = ("Enter username");
            }
            else if (TextBoxadminUPassword.Text == "")
            {
                LabelErrorAdmin.Text = ("Enter password");
            }

            else
            {


                Admin administrator = new Admin(TextBoxadminUsername.Text, TextBoxadminUPassword.Text,"admin","username","password");
                administrator.Login();
                if (administrator.GetState() == "success")
                {
                    AdminForm adminForm = new AdminForm();
                    adminForm.Show();
                    this.Hide();
                }
                else
                {
                    LabelErrorAdmin.Text = ("Incorrect username or password ");
                }

            }

            
        }
        //
        //SellerLogin function 
        //