private void deleteRowToolStripMenuItem_Click(object sender, EventArgs e)
{
while (dataGridView1.SelectedRows.Count > 0)
{
if (dataGridView1.Rows[dataGridView1.SelectedRows[0].Index].IsNewRow)
{
dataGridView1.SelectedRows[0].Selected = false;
continue;
}
dataGridView1.Rows.RemoveAt(dataGridView1.SelectedRows[0].Index);
}
}