Thanks for your posting and using Aspose.Cells for .NET.
Please download and try the latest version:
for .NET v220.127.116.11
If the problem persists, then please provide us your source xls/xlsx file which is throwing error. We will look into it and update you asap.
Thanks for providing the sample source xls file.
I was able to reproduce the exception using the latest version with the below code.
We have logged this issue in our database. Once we will fix this issue or we have some update, we will let you know.
This issue has been logged as CELLSNET-40338
string path = @“F:\Shak-Data-RW\Downloads\Sample.xls”;
Workbook workbook = new Workbook(path);
workbook.Save(path + “.out.xlsx”);
It’s the limitation of MS Excel about “Characters in a header or footer”:
We will only export 255 Characters if the header/footer length is greater than 255 , then MS Excel will not pop up error message,but the some characters will disappear.
If the font of the header or footer is same , please just set the font only once.
For example about left header:
Please simply enter:
Otherwise we have to remove the Characters beyond 255 Characters.
We have fixed this issue. Please download:
for .NET v18.104.22.168