private void showAllPlanesBtn_Click(object sender, EventArgs e)
{
showAllConveyance showAllConveyanceObj = new showAllConveyance("Plane", "show");
showAllConveyanceObj.Show();
}
private void showAllTrainBtn_Click(object sender, EventArgs e)
{
showAllConveyance showAllConveyanceObj = new showAllConveyance("Train", "show");
showAllConveyanceObj.Show();
}