Receiving message of issue with content in Excel File

Question

I am currently building an Excel file by hand using OpenXml. I'm in the process of adding the sheets, however, I have come across an issue. I have a loop that adds the names of each sheet in but once it runs and I try to open the file, I get the following message:

"We found a problem with some content in 'FileName.xlsx'. Do you want us to try to recover as much as we can? If you trust the source of this workbook, Click Yes."

I think the issue might be due that I am adding in the name of each sheet using a string variable. When I take it out and add something else, it works. Below is my code where I am looping through and adding my sheets.

//Technology Areas
foreach (DataRow dr in techAreaDS.Rows)
{
     var data = dr["TechAreaName"].ToString().Split('-');
     var techArea = data[2].TrimStart();

     var techAreaSheet = new Sheet { Id = workbookPart.GetIdOfPart(worksheetPart), 
                                     SheetId = sheetId, Name = techArea };
     sheets.Append(techAreaSheet);
     sheetId++;
}

I've seen people mention it is an issue with cells having strings that can be converted into strings, but in this case, the string will always be a string. Any help would be appreciated.

EDIT: I've figured out the problem. The issue is the Name property has a Max Length of 31. One of my items has a 42 length, hence the error. I did find a cool set of code to validate my OpenXml. Link.

UPDATE: Oddly enough, someone thinks this question was about finding some code to help validate what I was doing. It was not... The question is clear: why was I receiving an error when trying to name sheets. I was not asking for validation code, though I found some.

I do ask that if you wish to help, please read the question versus assume what I was asking, and if you don't know what I wish to have answered, ask...

Answer 1

I've figured out the problem. The issue is the Name property has a Max Length of 31 characters. The text I'm trying to use sometimes exceeds that limit (one has 42 characters). I also found a pretty cool set of code to validate my Open Xml to find out what the specific issue is. Link