void formImport_FormClosing(object sender, FormClosingEventArgs e)
{
formImport = null;
}
private void btnExport_Click(object sender, EventArgs e)
{
if (formImport == null)
{
formImport = new FormImport();
formImport.WindowState = FormWindowState.Maximized;
formImport.FormClosing += formImport_FormClosing;
formImport.MdiParent = this;
}
formImport.Show();
formImport.BringToFront();
}
