closing or hidding C# from when opening new form

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C#

I hav deveploed a C# project.I hav mutilple form in it. I want to close or hide the first form specified in Program.cs. I hav tried the code given here

private void btnClose_Click(object sender, EventArgs e)
{
Form frmSecond = new frmSecond();
frmSecond.Show();
frmSecond.Activate();
this.Close();
}

It doesnt work it closes Form1 the entres into Program.cs and again opens Form1. Is there any way to just hide or close it??


Thanks!!!