C#, System.InvalidOperationException is thrown when interacting with the database. How to fix?

Question

MySQL

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 MySql.Data.MySqlClient;

namespace bd_test_program
{
    
    public partial class Form1 : Form
    {
        
        public static string constr = "server =31.31.196.8; user id =tytid; password =tytpass; persistsecurityinfo = True; port =3306; database =u0558875_default; SslMode = none";
        public MySqlConnection conn = new MySqlConnection(constr);
        

        public Form1()
        {
            InitializeComponent();
            conn.Open();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            
        }

        private void vxod(object sender, EventArgs e)
        {

            string login = textBox1.Text;
            string password = textBox2.Text;
            //string sql = "Select Name from Accounts WHERE Login = 'admin' AND Password='yaadmin'";
            string sql = "Select Name from Accounts WHERE Login = '"+login+"' AND Password='"+password+"'";
             MySqlCommand command = new MySqlCommand(sql, conn); 
            string name = command.ExecuteScalar().ToString(); 
            MessageBox.Show(name);
            Form2 fr2 = new Form2();
            fr2.Show();
            Hide(); 


        }
    }
}

OPTIONAL: The error occurs when creating the second form, when working with one form, the error does not occur.

Answer 1

I advise you to look towards EntityFramework .
Show the code of the second form, there are no psychics here to guess what you have written there.

Answer 2

Full error code
System.InvalidOperationException: "Initialization is not possible due to missing CategoryName."