private void hideUnhideColumnToolStripMenuItem(object sender, System.EventArgs e)
{
ToolStripMenuItem menuItemSender = sender as ToolStripMenuItem;
DatabaseFunct.HideUnhideColumn(menuItemSender.Name, TableMainGridView);
menuItemSender.Checked = !menuItemSender.Checked;
hideUnhideColumnsToolStripMenuItem.ShowDropDown();
}