# Release Notes for Version 1.5.0.4

Detailed release notes for DsExcel version 1.5.0.4

## Content



## Enhancements from the Previous Release

The following features have been added with this version of the product.

*   Custom functions are now supported. The **CustomFunction** class has been introduced in order to allow users to perform custom arithmetic logic.
*   DsExcel .NET now uses **System.Drawing.Color** instead of GrapeCity.Documents.Excel.Color in order to allow users to set standard colors.
*   The Calculation engine now works on **iOS**.

## Resolved Issues

The following issues have been resolved since the last release.

*   Calculation results are now displayed correctly when a formula applied on a cell references an external workbook that was deleted.
*   Data validation rule is now retained when saving an Excel file with a source from a different sheet's range.