private void GetUserNamesAndSetToUserNameTxtBox_AutoComplete() { try { using (DataTable dtUserNames = UserMasterDAL.GetAllUsersInformation()) { if (dtUserNames != null) { if (dtUserNames.Rows.Count > 0) { AutoCompleteStringCollection usrNameColl = new AutoCompleteStringCollection(); for (int i = 0; i < dtUserNames.Rows.Count; i++) { if (dtUserNames.Rows[i]["USER_NAME"] != null) { usrNameColl.Add(dtUserNames.Rows[i]["USER_NAME"].ToString()); } } txtUserName.AutoCompleteMode = AutoCompleteMode.SuggestAppend; txtUserName.AutoCompleteSource = AutoCompleteSource.CustomSource; txtUserName.AutoCompleteCustomSource = usrNameColl; } } } } catch (Exception ex) { ErrorHandling.WriteErrorLog(ex.Message); } }