public string button_ClrError_Click(object sender, EventArgs e) { string resultStr = "ClrError OK"; MC07_S_RESULT sResult = new MC07_S_RESULT(0); if (MC07.ClrError(hDev, ref sResult) == false) { resultStr = "It failed in MC07.ClrError() : MC07.Result(1)=" + sResult.MC07_Result[1].ToString(); } return(resultStr); }