How can i share an UDP Client betwen Methodes in WPF? - wpf

Question

Im am kinda new to coding and had a question. When I open up a UDP-CLient by an button clic,k and try to access it from another Method, I just get the Error: The name "server" does not exist in current context.
The name "connected" does not exist in current context.
When I am connected to the server, I dont want to close the connection,and open it up again.
How Can I fix it?What am I missing? Looking forward for help!
I think it is the same problem with the boolean, it doesnt work either.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Net;
using System.Net.Sockets;
namespace WpfApp1
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
UdpClient server = new UdpClient();
Boolean connected = false;
}
public void connect_btn_Click(object sender, RoutedEventArgs e)
{
try
{
UdpClient server = new UdpClient(ip_box.Text, Convert.ToInt32(port_box.Text));
Byte[] sendBytes = Encoding.ASCII.GetBytes("Is anybody there?");
server.Send(sendBytes, sendBytes.Length);
connected = true;
}
catch { }
}
public void ip_box_TextChanged(object sender, TextChangedEventArgs e)
{
}
private void port_box_TextChanged(object sender, TextChangedEventArgs e)
{
}
private void send_data_btn_Click(object sender, RoutedEventArgs e)
{
Byte[] sendBytes = Encoding.ASCII.GetBytes("Test");
server.Send(sendBytes, sendBytes.Length);
}
}
}