How to handle null reference exception

Question

I am getting the following exception 

namespace abc

{

public partial class Form1 : Form

{

SqlConnection conn;

Functions FS = new Functions();

public Form1()

{

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)

{

FS.Connect();

toolStripStatusLabel1.Text = FS.Info[0].ToString()+" ("+FS.Info[1].ToString()+")";

}

private void packingSlipToolStripMenuItem_Click(object sender, EventArgs e)

{

PackingSlip PS = new PackingSlip();

PS.Show();

}

private void mastersToolStripMenuItem_Click(object sender, EventArgs e)

{

}

private void inwardToolStripMenuItem_Click(object sender, EventArgs e)

{

}

private void billWiseToolStripMenuItem_Click(object sender, EventArgs e)

{

}

}

}