Best way to get btc ,C#

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.SqlClient;

namespace Gst_Stg_Navigation

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

SqlDataAdapter sqlda = new SqlDataAdapter("select * from stagiaire","data source= . ; initial catalog = ecole ; integrated security= true");

DataSet ds = new DataSet();

int i=0;

private void Form1_Load(object sender, EventArgs e)

{

sqlda.Fill(ds, "Stagiaire");

}

private void btnPrem_Click(object sender, EventArgs e)

{

i = 0;

txtCode.Text = ds.Tables["Stagiaire"].Rows[i][0].ToString();

txtNom.Text = ds.Tables["Stagiaire"].Rows[i][1].ToString();

txtPrenom.Text = ds.Tables["Stagiaire"].Rows[i][2].ToString();

txtCode_Sp.Text = ds.Tables["Stagiaire"].Rows[i][3].ToString();

}

private void btnSuiv_Click(object sender, EventArgs e)

{

if (i < ds.Tables["Stagiaire"].Rows.Count - 1)

{

i++;

txtCode.Text = ds.Tables["Stagiaire"].Rows[i][0].ToString();

txtNom.Text = ds.Tables["Stagiaire"].Rows[i][1].ToString();

txtPrenom.Text = ds.Tables["Stagiaire"].Rows[i][2].ToString();

txtCode_Sp.Text = ds.Tables["Stagiaire"].Rows[i][3].ToString();

}

}

private void btnPrec_Click(object sender, EventArgs e)

{

if (i >0)

{

i--;

txtCode.Text = ds.Tables["Stagiaire"].Rows[i][0].ToString();

txtNom.Text = ds.Tables["Stagiaire"].Rows[i][1].ToString();

txtPrenom.Text = ds.Tables["Stagiaire"].Rows[i][2].ToString();

txtCode_Sp.Text = ds.Tables["Stagiaire"].Rows[i][3].ToString();

}

}

private void btnDern_Click(object sender, EventArgs e)

{

i = ds.Tables["Stagiaire"].Rows.Count - 1;

txtCode.Text = ds.Tables["Stagiaire"].Rows[i][0].ToString();

txtNom.Text = ds.Tables["Stagiaire"].Rows[i][1].ToString();

txtPrenom.Text = ds.Tables["Stagiaire"].Rows[i][2].ToString();

txtCode_Sp.Text = ds.Tables["Stagiaire"].Rows[i][3].ToString();

}

}

}