private void CopyClipBoardButton_Click(object sender, EventArgs e)
{
StringBuilder sb = new StringBuilder();
if (PCCsCheckListBox.Items.Count <= 0)
return;
for (int i = 0; i < PCCsCheckListBox.Items.Count; i++)
{
string str = PCCsCheckListBox.Items[i].Text;
sb.AppendLine(str);
}
Clipboard.SetText(sb.ToString());
}