DataBase'den Kontrolü

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using FirebirdSql.Data.FirebirdClient;
using System.Text;
using System.Windows.Forms;

namespace PcDr
{
    public partial class Form1 : Form
    {
          public Form1()
        {
            InitializeComponent();
          }
        FbConnection cnn = new FbConnection("User=SYSDBA;Password=masterkey;Database=c:DATAPCDR.gdb;DataSource=127.0.0.1; Port=3050;Dialect=3; Charset=WIN1254;Role=;Connection lifetime=15;Pooling=true; MinPoolSize=0;MaxPoolSize=50;Packet Size=8192;ServerType=0;");
        private void button4_Click(object sender, EventArgs e)
        {
            FbCommand cmm = new FbCommand("select kk.sira_no,kk.adi||' '||kk.soyadi from kullanicilar kk where kk.kullanici_adi='"+textBox6.Text+"' and kk.kullanici_sifre='"+textBox7.Text+"' and kk.goster is null",cnn);
            FbDataReader dtr = null;
            cnn.Open();
            dtr = cmm.ExecuteReader();
            int k_sira = -1;
            string k_ad = "";
            while (dtr.Read())
            {
                k_sira = int.Parse(dtr[0].ToString());
                k_ad = dtr[1].ToString();

            }
            cnn.Close();
            if (k_sira != -1 && k_ad != "")
            {
                MessageBox.Show(k_ad + " HOŞGELDİNİZ...!","PCDR KONTROL MERKEZİ...!");
                RibbonForm2 pcdr = new RibbonForm2();
                pcdr.Show();
                this.Hide();
            }
            else
            {
                MessageBox.Show("KULLANICI ADI VE ŞİFREYİ KONTROL EDİNİZ...!","PCDR KONTROL MERKEZİ...!");
            }
  }
}

Form İçinde Kullanıcı & Şifre Belirleme