Hi Maciej,
The formats in DotNet are not always the same as the formats in Excel. They use a different set of format strings. So the grid can't automatically use the same formats when exporting to excel.
In order to handle this, the UltraGridExcelExporter has an event called InitializeColumn where you can get the format applied to the grid column and set the format to be applied to the Excel cells. Very often they are the same so you can just assign one to the other. But sometimes you might need to translate from a DotNet format into one Excel can handle.
Mike, I'm using NetAdvantage 2011.2 and I've differents Cell types (checkbox,textbox) in my ultragrid, and one of those have a mask as this:
I want to put the same value in excel but can't use InitializeColumn event due to the different cell types. Do you have an idea to solve this issue?