Accessing controls of a child form from parent form

using System;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
    public partial class ParentForm : Form
    {
        private Button button1;
        private ChildForm childForm = new ChildForm();
        public ParentForm()
        {
            InitializeComponent();
        }
        private void InitializeComponent()
        {
            this.button1 = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(0, 0);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 0;
            this.button1.Text = "button1";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // ParentForm
            // 
            this.ClientSize = new System.Drawing.Size(284, 264);
            this.Controls.Add(this.button1);
            this.Name = "ParentForm";
            this.Load += new System.EventHandler(this.ParentForm_Load);
            this.ResumeLayout(false);
        }
        private void ParentForm_Load(object sender, EventArgs e)
        {
            childForm.Show();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            if (childForm.lblText() == "true")
            {
                childForm.lblText("false");
            }
            else
            {
                childForm.lblText("true");
            }
        }
    }
}

using System;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
    public partial class ChildForm : Form
    {
        private Label label1;
    
        public ChildForm()
        {
            InitializeComponent();
            label1.Text = "false";
        }
        internal string lblText()
        {
            return label1.Text;
        }
        internal string lblText(string text)
        {
            return label1.Text = text;
        }
        private void InitializeComponent()
        {
            this.label1 = new System.Windows.Forms.Label();
            this.SuspendLayout();
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(0, 0);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(35, 13);
            this.label1.TabIndex = 0;
            this.label1.Text = "label1";
            // 
            // ChildForm
            // 
            this.ClientSize = new System.Drawing.Size(284, 264);
            this.Controls.Add(this.label1);
            this.Name = "ChildForm";
            this.ResumeLayout(false);
            this.PerformLayout();
        }
    }
}

internal string lblText()
        {
            return label1.Text;
        }
        internal string lblText(string text)
        {
            return label1.Text = text;
        }

internal string lblText
        {
            get { return label1.Text; }
            set { label1.Text = value; }
        }

if (childForm.lblText == "true")
            {
                childForm.lblText = "false";
            }
            else
            {
                childForm.lblText = "true";
            }