DataSet ds = new DataSet(); ds.Tables.Add("Contacts"); ds.Tables[0].Columns.Add("Email"); ds.Tables[0].Columns.Add("FirstName"); ds.Tables[0].Columns.Add("LastName"); Microsoft.Office.Interop.Outlook.Items OutlookItems; Microsoft.Office.Interop.Outlook.Application outlookObj; Microsoft.Office.Interop.Outlook.MAPIFolder Folder_Contacts; outlookObj = new Microsoft.Office.Interop.Outlook.Application(); Folder_Contacts = (Microsoft.Office.Interop.Outlook.MAPIFolder)outlookObj.Session.GetDefaultFolder(Microsoft.Office.Interop.Outlook.01DefaultFolders.olFolderContacts); OutlookItems = Folder_Contacts.Items; for (int i = 0; i < OutlookItems.Count; i++) { Microsoft.Office.Interop.Outlook.Contactltem contact = (Microsoft.Office.Interop.Outlook.ContactItem)OutlookItems[i + 1]; DataRow dr = ds.Tables[0].NewRow(); dr[0] = contact.EmaillAddress; dr[1] = contact.FirstName; dr[2] = contact.LastName; ds.Tables[0].Rows.Add(dr); }