Instantiating a new object failed?

using System;

public class InvItem
{
    public int ItemNo { get; set; }
    public string Description { get; set; }
    public int Price { get; set; }

    public InvItem(int itemNo, string description, int price)
    {
        ItemNo = itemNo;
        Description = description;
        Price = price;
    }

    public string GetDisplayText()
    {
        return ItemNo.ToString() + "    " + Description + " ($" + Price.ToString() + ")";
    }
}

using System;

public class InvItem
{
    public int ItemNo { get; set; }
    public string Description { get; set; }
    public int Price { get; set; }

    public InvItem(int itemNo, string description, int price)
    {
        ItemNo = itemNo;
        Description = description;
        Price = price;
    }

    public string GetDisplayText()
    {
        return ItemNo.ToString() + "    " + Description + " ($" + Price.ToString() + ")";
    }
}

        // Create new inventory item
        InvItem invItem = null;

        // Take values from fields and instantiate a new inventory item object using those values
        public InvItem getInvItem()
        {
            int newItemNo = int.Parse(txtItemNo.Text);
            string newDescription = txtDescription.Text;
            int newPrice = int.Parse(txtPrice.Text);

            InvItem newInvItem = new InvItem(newItemNo, newDescription, newPrice);
            MessageBox.Show(newInvItem.GetDisplayText());
            return newInvItem;
}

        // Create new inventory item
        InvItem invItem = null;

        // Take values from fields and instantiate a new inventory item object using those values
        public InvItem getInvItem()
        {
            int newItemNo = int.Parse(txtItemNo.Text);
            string newDescription = txtDescription.Text;
            int newPrice = int.Parse(txtPrice.Text);

            InvItem newInvItem = new InvItem(newItemNo, newDescription, newPrice);
            MessageBox.Show(newInvItem.GetDisplayText());
            return newInvItem;
}