private void CopyGridToClipboard()
{
if (simpleGridView.SelectedCells.Count <= 0)
{
Clipboard.SetText("");
return;
}
var arr = new DataGridViewCell[simpleGridView.SelectedCells.Count];
simpleGridView.SelectedCells.CopyTo(arr, 0);
var colIndexArr = arr.Select(a => a.ColumnIndex).Distinct().OrderBy(a => a)
.Select(a => simpleGridView.Columns[a].HeaderText).ToArray();
var builder = new StringBuilder();
builder.AppendLine();
builder.AppendLine($"\t{colIndexArr}");
builder.AppendLine(simpleGridView.GetClipboardContent()?.GetText());
Clipboard.SetText(builder.ToString());
}