C#

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 System.Data.OleDb;
using MySql.Data.MySqlClient;

namespace IncomeLoops
{
    public partial class Form1 : Form
    {
        MySqlConnection con = new MySqlConnection("Server=flightppl.com.mysql; Database=Removed;Uid=Removed;Pwd=Removed");
        MySqlDataAdapter da;
        DataTable dt = new DataTable();
        int i;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            con.Open();
            MySqlCommand cmd = con.CreateCommand();
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = "select * from wp_users where user_login='" + textBox1.Text + "' and user_pass='" + textBox2.Text + "' ";
            cmd.ExecuteNonQuery();
            da = new MySqlDataAdapter(cmd);
            da.Fill(dt);
            i = Convert.ToInt32(dt.Rows.Count.ToString());

            if (i == 0)
            {
                Form2 frm = new Form2();
                frm.Show();
            }
            else
            {
                
            }
            con.Close();
        }
    }
}

cellData = Convert.ToString(excelRange.Cells[rowCount, colCount].Value2);

public class ContactViewModel : ViewModelBase
    {
        public ObservableCollection<Contact> ContactList;

        public ContactViewModel()
        {
            ContactList = new ObservableCollection<Contact>(cbdc.Contacts);
        }

public class ConversationViewModel : ViewModelBase
    {
        public ObservableCollection<Conversation> ConversationList;

        public ConversationViewModel()
        {
            ConversationList = new ObservableCollection<Conversation>(cbdc.Conversations);
        }

    }

public class ViewModelBase: INotifyPropertyChanged
    {
        public ContactLinqToSQLClassesDataContext cbdc = new ContactLinqToSQLClassesDataContext();


        #region INotifyPropertyChanged

        public event PropertyChangedEventHandler PropertyChanged;
        internal void RaisePropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }
        #endregion

<ListBox x:Name="ContactsLstBx" HorizontalAlignment="Left" Height="289" Margin="10,50,0,0" VerticalAlignment="Top" Width="115" ItemsSource="{Binding ContactList}">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding Path=Name}" />
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
        <ListBox x:Name="ConversationLstBx" HorizontalAlignment="Left" Height="134" Margin="333,50,0,0" VerticalAlignment="Top" Width="115" ItemsSource="{Binding ConversationList}">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding Path=Title}" />
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>