To delete all the list items in a SharePoint list using Batch in server side Code

private void DeleteAllItemsUsingBatch()  

    {  

        using (SPSite site = new SPSite("http://mySharePointServer"))  

        {  

            SPWeb web = site.OpenWeb("/");  

            SPList list = web.Lists["Links"];  

            StringBuilder sb = new StringBuilder();  

            sb.Append("<batch>");  

            string batchCommand = "<method><setlist scope=\"Request\">" + list.ID + "</setlist><setvar name=\"ID\">{0}</setvar><setvar name=\"Cmd\">DELETE</setvar></method>";  

            foreach (SPListItem item in list.Items)  

            {  

                sb.Append(string.Format(batchCommand, item.ID.ToString()));  

            }  

            sb.Append("</batch>");  

            web.AllowUnsafeUpdates = true;  

            site.RootWeb.ProcessBatchData(sb.ToString());  

            web.AllowUnsafeUpdates = false;  

            web.Close();  

        }  

    }