Format of the initialization string does not conform to specification starting at ind

[tomenjerry]

im having an error. please help me.. many thanks!
heres my code.

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.Data.SqlServerCe;


namespace Project1
{

    
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

      
        
        System.Data.SqlServerCe.SqlCeDataAdapter da;
        DataSet ds1;

       
        private void button1_Click(object sender, EventArgs e)
        {
            System.Data.SqlServerCe.SqlCeConnection konek;
           // System.Data.SqlServerCe.SqlCeConnection[Confi.AppSettings["EventConnectionString"]); 
            
            konek = new System.Data.SqlServerCe.SqlCeConnection();
            konek.ConnectionString = "C:\\Users\\BRAVO\\Documents\\Visual Studio 2008\\Projects\\Project1\\Project1\\Database1.sdf";
            konek.Open();

            DataTable dt = new DataTable();

            ds1 = new DataSet();
            string sql = "SELECT * FROM security WHERE username ='"+textBox1.Text+"' and password = '"+textBox2.Text+"'";
            da = new System.Data.SqlServerCe.SqlCeDataAdapter(sql, konek);
            da.Fill(ds1, "security");

            if (dt.Rows.Count > 0)
            {
                Main secondform;
                secondform = new Main();
                this.Dispose();

            }

            else
                MessageBox.Show("Invalid Username/Password");

            konek.Close();

        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button2_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }
    }
}

[Rabbit]

It would help to see the full error message and the line number that throws the error.