DevExpress Grid 컬럼 에러 표시

컬럼 에러 표시
foreach (DataRow row in dtMasterCheck.Rows)
{
    filter = string.Format("TEST = '{0}'", row["TEST"]);
    DataRow[] drMaster = _dsMaster.Tables[0].Select(filter);

    foreach(DataRow checkRow in drMaster)
    {
        checkRow.ClearErrors();
        foreach (string columnName in requiredMsterColumns)
        {
            if (checkRow[columnName].ToStringNull() == "")
            {
                checkRow.SetColumnError(columnName, "필수입력");
                check = false;
            }
        }
    }
}