Form1.cs

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

namespace sql
{
    public partial class Form1 : Form
    {
        
        string connectstring;
        SqlConnection cn;
        List<string> list = new List<string>();
        List<string> li = new List<string>();
        string userId = "";
        string password = "";
        string database = "";

        public Form1()
        {
            InitializeComponent();
        }

        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            textBox2.Enabled = textBox3.Enabled = !checkBox1.Checked;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            groupBox2.Enabled = true;

             database = textBox1.Text;
             userId = textBox2.Text;
             password = textBox3.Text;
            try
            {
                string sql = string.Format("select name from sys.databases");
                if (checkBox1.Checked)
                {
                     connectstring = string.Format(" data source={0}; initial catalog=master;integrated security=sspi", database);
                }
                else
                {
                    connectstring = string.Format(" data source={0}; initial catalog=master;user id={1};password={2}", database, userId, password);
                }
                cn = new SqlConnection(connectstring);
                cn.Open();
                SqlCommand cm = new SqlCommand(sql, cn);
                SqlDataReader dr = cm.ExecuteReader();
                
                while (dr.Read())
                {