Freeing or clearing created objects

I have 2 windows forms; Form1.cs and Form2.cs.

Here are the code for Form1.cs in which will show the Form2.cs and Hide the the current Form1.cs

private void button1_Click(object sender, EventArgs e)
{
    Form2 f2 = new Form2();
    f2.Show();
    this.Hide();
}

Here are the code for Form2.cs in which will show the Form1.cs and Hide the the current Form2.cs

private void button1_Click(object sender, EventArgs e)
{
    Form2 f2 = new Form2();
    f2.Show();
    this.Hide();
}

I have monitored the memory usage of the application and I have noticed that the memory usage of the application is increasing every time I execute the code above.