public virtual Dictionary <string, string> GetFilterValues(DataTable dt)
{
var empty = "(Empty)";
var dic = dt.AsEnumerable().Select(item => Convert.ToString(item[FieldName]))
.OrderBy(item => item).Distinct(StringComparer.InvariantCultureIgnoreCase)
.ToDictionary(item => item, item => string.IsNullOrEmpty(item) ? empty : DataViewUtils.TrimStringOverMaxLength(item));
return(dic);
}