How to delete large Share point List data efficiently

To delete large data from share point list efficiently

SPWeb CurrentSite = SPContext.Current.Web;

CurrentSite.AllowUnsafeUpdates = true;

SPList spList = CurrentSite.Lists["MyList"];

StringBuilder sbDelete = new StringBuilder();

sbDelete.Append("");

string command = "" + spList.ID +";

"{0}Delete

foreach (SPListItem item in spList.Items)

{

   sbDelete.Append(string.Format(command, item.ID.ToString()));

}

sbDelete.Append("");

CurrentSite.ProcessBatchData(sbDelete.ToString());