private void precipitation_btn_Click(object sender, EventArgs e)
{
if (precipitationForm == null)
{
precipitationForm = new PrecipitationForm();
precipitationForm.FormClosed += PrecipitationForm_FormClosed;
}
this.Cursor = Cursors.WaitCursor;
precipitationForm.Show();
this.Hide();
}
private void PrecipitationForm_FormClosed(object sender, FormClosedEventArgs e)
{
precipitationForm.FormClosed -= PrecipitationForm_FormClosed;
precipitationForm = null;
}