System.Configuration.ConfigurationManager

So sorry I'm brazilam and my English is so poor, I add reference and then appear the class ConfigurationManager to me thank you so much.

First thanks for your reply follow there is my font

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Data.SqlClient;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Configuration;

namespace Pipe_Analyst_Control

public partial class Conexao : Form

public Conexao()

private void Cancelbutton_Click(object sender, EventArgs e)

this.Dispose();

private void Savebutton_Click(object sender, EventArgs e)

SqlConnectionStringBuilder bilder = new SqlConnectionStringBuilder();

bilder.InitialCatalog = "pipedata";

bilder.IntegratedSecurity = true;

ConfigurationSettings.AppSettings.Set("pipedataConnectionString", bilder.ConnectionString);

//here I must use ConfigurationManager but it is unviable.

private void Testbutton_Click(object sender, EventArgs e)

SqlConnection SqlCon = new SqlConnection(Pipe_Analyst_Control.Properties.Settings.Default.pipedataConnectionString);

try

MessageBox.Show("ConexÆo configurada com sucesso", "Sucesso", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);

catch

MessageBox.Show("A conexÆo falhou por favor configure novamente ou tente salvar as configura‡äes vigentes", "ERRO", MessageBoxButtons.OK, MessageBoxIcon.Error);