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EPPlus InsertRow corrupts excel file

I am currently comparing different files with each other and put the output in an Excel Workbook with multiple worksheets (one per file comparison) using EPPlus 4.5.3.3.
The worksheets are simple ranges - no tables.
Sometimes it is required to move the content of one Excel Sheet to a certain row in another Excel Sheet.
For this I am using the InsertRow function of EPPlus. The function itself does the trick and inserts the content at the desired row.
However, when opening the Workbook I receive these errors:
The content of that XML file is the following:
<?xml version="1.0" encoding="UTF-8" standalone="true"?>
-<recoveryLog xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
<logFileName>error044200_02.xml</logFileName>
<summary>Errors were detected in file 'C:\Users\...\test.xlsx'</summary>
-<repairedParts>
<repairedPart>Repaired Part: /xl/worksheets/sheet5.xml part with XML error. Load error. Line 1, column 0.</repairedPart>
</repairedParts>
When I am adding the content at the last row without using InsertRow everything is working fine.
Also, if I save the ExcelPackage immediately after using InsertRow the error is also present, so it definitely has something to do with this function (also if I am only using one Worksheet). After using InsertRow it seems like the whole formatting of the respective Excel Sheet is screwed up. The inserted content appears to be right though.
The excel is initially created from an empty template excel that contains nothing but the header names (also had the same issue with a template without anything inside):
The following code can be used to reproduce (this is just an example - in my case every sheet has more than 50 rows):
FileInfo filePath= new FileInfo(fileName);
excel = new ExcelPackage(filePath);
ExcelWorkbook wb = excel.Workbook;
foreach (ExcelWorksheet ws in wb.Worksheets)
{
int i = 5;
ws.InsertRow(i, 1);
//same effect with ws.InsertRows(i, 1, i-1)
ws.Cells[i, 1].Value = "test";
ws.Cells[i, 2].Value = "test";
//excel.Save();
}
excel.Save();

Although my answer is not based on EPPlus, have you looked at this post ?
Inserting new rows and moving exsisting ones with OpenXML SDK 2.0
I am guessing that you are getting errors because the newly added rows from the ws.InsertRow function are not updating the required row indexes. This is mentioned in the post.
Also there is a recommendation in the comments "To anyone who is getting an error when opening the file try this line before you save your document'... xlsFile.WorkbookPart.DeletePart(xlsFile.WorkbookPart.CalculationChainPart);

EPPlus Shows System Argument Exception

I am having issue reading in some worksheet from a workbook using C# and EPPlus.
Error Message
name contains invalid characters
Even after multiple checks on the worksheet name, file name and column headers within the workbook to make sure there is no invalid characters, I am still facing the same error.
However, when I move the worksheet that i need from that same workbook to a new Excel file and save it with the same file name and worksheet name, I have no error while reading in.
Does anybody know how to solve or even encounter this problem?
Code
using (ExcelPackage xlPackage = new ExcelPackage(mStream))
{
//WorksheetId = 5
var ws = xlPackage.Workbook.Worksheets[WorksheetId]; //This is the part that is causing error
for (int i = 1; i <= ws.Dimension.End.Column; i++)
{
dt2.Columns.Add((i - 1).ToString());
}
}

Came across this LINK and realized this is actually a bug in EPPlus for version 4.5.2.2 onward.
After reverting back to the older version, everything works fine.

There is a change the "name" as mentioned in the error is not the sheet name.. There is a section in the Formular tab of the Excel software called "Name Manager".
There you will find list of names and references there. The error above per the source code of EPPlus is generated when EPPlus tries to validate the name range.
I had to modify the EPPlus source code to ignore the error since the file i was dealing with was locked and needed to be preserved as it was.

How to access data in sheet in my Visual Studio Office Excel workbook?

I need to create a "Document level customization" with C# code (not and Excel Add-in!)
I created a Visual Studio Office Excel 2010 Workbook project type. This creates a workbook with 3 sheets in my project. I added some "configuration" information to one of those sheets.
I need to access this configuration information programmatically (Sheet1 contains a button - pressing on that button should
load configuration data
open a WinForm
present configuration data on that form,
but somehow I can't find how to do that...
If I try to initialize Sheet1 class, compiler expects two parameters - Microsoft.Office.Tools.Excel.Factory and IServiceProvider, but I am calling this from a button that is placed on Sheet2 - so it's after Excel Workbook is already opened... shouldn't Sheet1 be initialized automatically?
So, how can I access Sheet1 from my VSTO project's c# code?
EDIT
Please see project sample screencast here
I have a button on Sheet2, that should
load some data from Sheet1
initialize WinForm
add it as a DataSource for a ComboBox on that WinForm
I can not find a way how to read data from that Sheet1...

It seems, that there are not a lot developers (at least at stackoverflow) that work with Excel workbooks in Visual Studio / VSTO), but still this is is how I got this basic stuff working - in case if this is helpful to someone else
Since my code was in the Worksheet's *.cs file it turned out I can access project's xlsx file this way:
var excel = (Excel.Application)this.Application;
var xlbook = (Excel.Workbook)excel.ActiveWorkbook;
var worksheets = xlbook.Worksheets;
var sheet = (Excel.Worksheet)worksheets["Sheet3"];
int row = 2;//1st row for column titles
while (!string.IsNullOrEmpty(((Excel.Range)sheet.Cells[row, 2]).Value))
{
var weight = ((Excel.Range)sheet.Cells[row, 3]).Value;
row++;
}
Some additional things about processing data from Excel sheet in c# code, I found out (maybe that's helpful for someone):
the .NET type for Excel Cell is Excel.Range (at least I didn't
find any other option)
when reading cell that is empty in Excel file, it's value on .NET side is null, not ""
values that seem to be strings on Excel side - can turn to be different types when loaded on c# side. I don't know if it's the best way, but I solved it like this:
var weight = (((Excel.Range)sheet.Cells[row, 3]).Value);
if (weight is double)
{
product.Weight = ((double)((Excel.Range)sheet.Cells[row, 3]).Value).ToString();
}
else if (weight is string)
{
product.Weight = ((Excel.Range)sheet.Cells[row, 3]).Value;
}

How can I read an Excel 2010 file in my C# code using a DLL?

UPDATE1:
I am using Excel 2010 and I've searched the web and found thousands upon thousands of ways to do this via win form, console, etc. But I can't find a way to do this via DLL. and none of the sample on-line is complete all in bit and pieces.
UPDATE END
I have looked and goggled but did not get the specific what i am looking for, as show below the excel sample sheet.
i'm looking a way to read and store the each cell data in a variable
i have started something like this:
Workbook workbook = open(#"C:\tmp\MyWorkbook.xls");
IWorksheet worksheet = workbook.Worksheets[0];
IRange a1 = worksheet.Cells["A1"];
object rawValue = a1.Value;
string formattedText = a1.Text;
Console.WriteLine("rawValue={0} formattedText={1}", rawValue, formattedText);

Your code can work with a couple changes.
One thing to remember is that Excel worksheets are 1-based, not 0-based (and use Worksheet instead of IWorksheet):
Worksheet worksheet = workbook.Worksheets[1];
And to get a range, it is easiest to call get_Range() on the worksheet object (and use Range instead of IRange):
Range a1 = worksheet.get_Range("A1");
With those two lines of code changed, your example will work fine.
UPDATE
Here is a "complete" example:
Right-click your project in the solution explorer and click "Add
Reference".
Click on the COM tab and sort the list by Component Name. Find "Microsoft Excel 14.0 Object Library" in the list and select it. Click OK.
In the code file where you want this to run, add a using Microsoft.Office.Interop.Excel;
Use this code, which I've modified as little as possible from your example:
var excel = new Microsoft.Office.Interop.Excel.Application();
Workbook workbook = excel.Workbooks.Open(#"C:\tmp\MyWorkbook.xls");
Worksheet worksheet = workbook.Worksheets[1];
Range a1 = worksheet.get_Range("A1");
object rawValue = a1.Value;
string formattedText = a1.Text;
Console.WriteLine("rawValue={0} formattedText={1}", rawValue, formattedText);

Excel.Sheets sheets = workbook.Worksheets;
Excel.Worksheet worksheet = (Excel.Worksheet)sheets.get_Item(1);
System.Array myvalues;
Excel.Range range = worksheet.get_Range("A1", "E1".ToString());
myvalues = (System.Array)range.Cells.Value;

If you don't want to be in a war with com components and registering dlls,
the best way to read excel is Excel Reader for .NET
I have been using it for so long time , and I can say it just works.
and excelReader.IsFirstRowAsColumnNames property makes everything easy.
You can play your data within a dataset.

.NET Excel File Parser

So the company I'm working for is looking for a means to verify that a given .xls/.xlsx file is valid. Which means checking columns and rows and other data. He's having me evaluate GrapeCity Spread and SpreadsheetGear, but I'm wondering if anyone else has any other suggestions of external tools to check out.
We don't need a means to export .xls files or anything like that, just the ability to import them and verify they are valid based on a set of criteria I create.
Thanks.

If you need just to compare cell values you can use ADO.NET driver, for anything else will be required Excel or third party component. I am using SpreadsheetGear. When I was evaluating this component 3 years ago I have found an issue with conditional formatting for cell with absolute reference, but issue was quickly resolved. They have same day support response.

To my mind, the easiest way to handle this is to use an ODBC Excel data provider. I find it more straightforward to work with than the PIAs.
// Connection string for Excel 2007 (.xlsx)
string dbConnStr = #"Driver={Microsoft Excel Driver (*.xls, *.xlsx, *.xlsm, *.xlsb)};Dsn=Excel Files;dbq=C:\temp\mySpreadsheet.xlsx";
// Connection string for Excel 98-2003 (.xls)
//string dbConnStr = #"Driver={Microsoft Excel Driver (*.xls)};driverid=790;dbq=C:\temp\mySpreadsheet.xls;defaultdir=c:\temp";
OdbcCommand cmd = new OdbcCommand("Select * from [SheetName$]", new OdbcConnection(dbConnStr));
cmd.Connection.Open();
OdbcDataReader dr = cmd.ExecuteReader();
foreach (System.Data.IDataRecord item in dr)
{
// Check specific column values, etc
string id = item["Column Name"].ToString();
}

You can use the Microsoft.Office.Interop.Excel library to access any workbook the same way you do in Excel VBA.
Code looks like this:
using Excel = Microsoft.Office.Interop.Excel;
Excel.Application excel = new Excel.Application();
Excel.Workbook workbook = excel.Workbooks.Open("datasheet.xls");
Excel.Worksheet worksheet = workbook["Sheet1"] as Excel.Worksheet;
string someData = (worksheet.Range["A2"] as Excel.Range).Value.ToString();
worksheet = null;
workbook.Close();
excel.Quit();

Depending on your budget, the Aspose libraries are great. Not cheap but work very, very well.

you can use the oleDb from Microsoft to access the excel data as any other database system. You can get the right connection string from connectionstrings

Maybe the NPOI project can be useful (I have never used it though).
Best

Check out Excel Data Reader GitHub (formerly on CodePlex). I've used this a few times and it works well.
Be warned however that there are bugs reading .xlsx files where cells are skipped. Apply this patch (link is to Codeplex and out of date) I submitted for v2.0.1.0 to fix the problem. (The project maintainers don't seem active and I've had problems contacting them.)