Open a new window by button click in parent form in winforms application

//Write this code in button click event of Form1
private void button1_Click(object sender, EventArgs e)
{
    Form2 frmObj = new Form2();
    frmObj.Show();
}

//Write this code in button click event of Form1
private void button1_Click(object sender, EventArgs e)
{
    Form2 frmObj = new Form2();
    frmObj.ShowDialog();
}