New Form Wont Load C# THrowing exeption

Question

       private void button1_Click(object sender, EventArgs e)
            MainTool form = new MainTool();
            this.Hide();
            form.Show();
this is what i have on a button on a blank form....i have done this beccause VS willnot open my "MainTool".... when i press this button i get an exception:
A first chance exception of type 'System.TypeInitializationException' occurred in WindowsFormsApplication10.exe
Additional information: The type initializer for 'WindowsFormsApplication10.MainTool' threw an exception.
If there is a handler for this exception, the program may be safely continued.
            Please help as this was working earlier and out of nowhere stopped......i have NO errors and wtill this crap please help ASAP

Answer 1

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;
namespace WindowsFormsApplication10
public partial class Form1 : Form
public MainTool mainToolFrm;
public Form1()
InitializeComponent();
private void button1_Click(object sender, EventArgs e)
this.Hide();
mainToolFrm = new MainTool(this);
mainToolFrm.Show();
MainTool form with only ar closed event.
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;
namespace WindowsFormsApplication10
public partial class MainTool : Form
private Form1 form1;
public MainTool(Form1 form1)
InitializeComponent();
this.form1 = form1;
private void MainTool_FormClosed(object sender, FormClosedEventArgs e)
form1.mainToolFrm = null;
form1.Show();
You will be able to go back and forth as much as you want.
Good Luck