private void button_tab3_add_Click(object sender, RoutedEventArgs e)
 {
     if (dataGrid_tab.SelectedItems.Count > 0)
     {
         if (table == 0)
         {
             if (form_number == 0)
             {
                 AdminWindow f = (AdminWindow)form;
                 f.id1 = Convert.ToInt32((dataGrid_tab.Columns[0].GetCellContent(dataGrid_tab.Items[dataGrid_tab.SelectedIndex]) as TextBlock).Text);
             }
             c.Text            = (dataGrid_tab.Columns[2].GetCellContent(dataGrid_tab.Items[dataGrid_tab.SelectedIndex]) as TextBlock).Text;
             this.DialogResult = true;
         }
         if (table == 1)
         {
             if (form_number == 0)
             {
                 AdminWindow f = (AdminWindow)form;
                 f.id2 = Convert.ToInt32((dataGrid_tab.Columns[0].GetCellContent(dataGrid_tab.Items[dataGrid_tab.SelectedIndex]) as TextBlock).Text);
             }
             if (form_number == 1)
             {
                 StaffWindow f = (StaffWindow)form;
                 f.id2 = Convert.ToInt32((dataGrid_tab.Columns[0].GetCellContent(dataGrid_tab.Items[dataGrid_tab.SelectedIndex]) as TextBlock).Text);
             }
             c.Text            = (dataGrid_tab.Columns[2].GetCellContent(dataGrid_tab.Items[dataGrid_tab.SelectedIndex]) as TextBlock).Text;
             this.DialogResult = true;
         }
         if (table == 2)
         {
             c.Text            = (dataGrid_tab.Columns[0].GetCellContent(dataGrid_tab.Items[dataGrid_tab.SelectedIndex]) as TextBlock).Text;
             this.DialogResult = true;
         }
         if (table == 3)
         {
             if (form_number == 1)
             {
                 StaffWindow f = (StaffWindow)form;
                 f.id_k1 = Convert.ToInt32((dataGrid_tab.Columns[0].GetCellContent(dataGrid_tab.Items[dataGrid_tab.SelectedIndex]) as TextBlock).Text);
             }
             c.Text            = (dataGrid_tab.Columns[6].GetCellContent(dataGrid_tab.Items[dataGrid_tab.SelectedIndex]) as TextBlock).Text;
             this.DialogResult = true;
         }
         if (table == 4)
         {
             if (form_number == 1)
             {
                 StaffWindow f = (StaffWindow)form;
                 f.id_k2 = Convert.ToInt32((dataGrid_tab.Columns[0].GetCellContent(dataGrid_tab.Items[dataGrid_tab.SelectedIndex]) as TextBlock).Text);
             }
             c.Text            = (dataGrid_tab.Columns[6].GetCellContent(dataGrid_tab.Items[dataGrid_tab.SelectedIndex]) as TextBlock).Text;
             this.DialogResult = true;
         }
     }
 }
 private void button_Click(object sender, RoutedEventArgs e)
 {
     if (textBox1.Text == "127.0.0.1")
     {
         if (checkBox.IsChecked == true)
         {
             connection = "Data Source=localhost; Database=Teploseti; User Id=" + textBox1_Copy.Text + "; password="******"Data Source=localhost;Database=Teploseti; Trusted_Connection=True";
         }
     }
     else
     {
         if (checkBox.IsChecked == true)
         {
             connection = "Data Source=" + textBox1.Text + ";Database=Teploseti; User Id=" + textBox1_Copy.Text + "; password="******"Data Source=" + textBox1.Text + ";Database=Teploseti; Trusted_Connection=True";
         }
     }
     try
     {
         context = new DBase(connection);
         var acc = context.Аккаунты.Where(c => c.Логин == textBox.Text).ToList();
         if (acc.Count == 0)
         {
             MessageBox.Show("Login dosn't exist!");
             return;
         }
         else
         {
             if ((acc[0].Логин == textBox.Text) && (acc[0].Хэш_пароль == getMD5String(passwordBox.Password)))
             {
                 Properties.Settings.Default.login_db = textBox.Text;
                 Properties.Settings.Default.ip_db    = textBox1.Text;
                 if (checkBox.IsChecked == true)
                 {
                     Properties.Settings.Default.mode = true;
                 }
                 else
                 {
                     Properties.Settings.Default.mode = false;
                 }
                 Properties.Settings.Default.login    = textBox1_Copy.Text;
                 Properties.Settings.Default.password = passwordBox1.Password;
                 Properties.Settings.Default.Save();
                 if (acc[0].Администратор)
                 {
                     AdminWindow form = new AdminWindow(context, acc[0]);
                     this.Hide();
                     form.ShowDialog();
                     this.Close();
                 }
                 else
                 {
                     StaffWindow form = new StaffWindow(context, acc[0]);
                     this.Hide();
                     form.ShowDialog();
                     this.Close();
                 }
             }
             else
             {
                 MessageBox.Show("Wrong password!");
                 return;
             }
         }
     }
     catch (Exception ex)
     {
         MessageBox.Show("Error! " + ex.Message);
         return;
     }
 }