public static void showUserForm(Form form)
{
frmUsers frmUsers = new frmUsers();
frmUsers.MdiParent = form;
frmUsers.Show();
}
private void btnLogin_Click(object sender, EventArgs e)
{
frmUsers frmUsers = new frmUsers();
frmUsers.MdiParent = this.MdiParent;
frmUsers.Show();
}