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How to close Excel c#

this is my code, I have seen others closing excel sheets this way but why does this not work. There are no errors in the code execution but the app still seems to be running in the background
Microsoft.Office.Interop.Excel.Application Excel = new Microsoft.Office.Interop.Excel.Application();
Microsoft.Office.Interop.Excel.Workbook Sheet = Excel.Workbooks.Open("C:\\Users\\Maxine\\Testing.xlsx");
Microsoft.Office.Interop.Excel.Worksheet x = ((Microsoft.Office.Interop.Excel.Worksheet)Excel.ActiveSheet);
Sheet.Close(false,Type.Missing,Type.Missing);
Excel.Quit();

You need to actually release the COM object. See here, but you need to do Marshal.FinalReleaseComObject on the Excel object.

C# - Excel - How to delete visible rows after AutoFilter?

I´m working on a little commandline tool to extract some data from an excel sheet.
I want to delete all rows which are visible after applying an AutoFilter.
Unfortunately, I just don´t know how to continue.
After some searching, I did not find a working answer for me.
Here is what I´ve got so far:
oXL = new Excel.Application();
oXL.Visible = false;
oWB = oXL.Workbooks.Open(source);
oXS = (Excel.Worksheet)oWB.Sheets[1];
Excel.Range filter = oXS.UsedRange;
filter.AutoFilter(8, "<>text to filter");
How do I delete all rows which are shown after filtering?
Thanks.
CRowland

Excel.Range filter = XlSheet_1.UsedRange;
filter.AutoFilter(8, "<>text to filter");
filter.Delete(XlDeleteShiftDirection.xlShiftUp);

Maybe it's a bit late for an answer but I put it for reference.
Every Excel.Range object has a Delete() method:
Excel.Range filter = oXS.UsedRange;
filter.AutoFilter(8, "<>text to filter");
filter.AutoFilter.Range.Delete();

You can take a look on this VBA reference. BTW, you will need to set up the EnableAutoFilter value for the worksheet before you operate the AutoFilter function.
https://danwagner.co/how-to-delete-rows-with-range-autofilter/

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.

Pass parameters to VSTO-enabled Excel Spreadsheet on server

I created an Excel 2010 Workbook project with to customize some ribbon extensions. It uses a webservice to read in data to pre-populate the form. My question is, how can I pass in some parameters, for example a record ID, to the workbook when it is requested from the server?
I think my scenario is similar to this question, which was never answered: Pass Data into a VSTO Excel Workbook?

There is a way of passing data to a workbook which personally I don't really like, but maybe it can suit you. Basically, you set values for specific cells in the workbook, and then process those values in Excel's event handler:
Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
Microsoft.Office.Interop.Excel.Workbook wb = excel.Workbooks.Open(filepath);
var sheet = (Microsoft.Office.Interop.Excel.Worksheet)wb.Worksheets[1];
var range = sheet.Range["A1"];
range.Value2 = "some value";

Get the current Workbook Object in C#

I've been writing an application in C# which creates Custom Document properties in an Excel spreadsheet, I have a function for this which takes in a Workbook Object...
However, actually getting the current Workbook object is proving to be quite annoying, I am using ExcelDNA to add functionality, however, I can't seem to pass my function a valid Workbook COM object.

If you need to find the activeworkbook with C#, if you are using Office Interop, you can try this kind of code:
(Workbook)Globals.ThisAddIn.Application.ActiveWorkbook;
[Source]

This is the way I am currently doing it it seems to work really well
using Excel = Microsoft.Office.Interop.Excel;
Then you get active workbook
//Gets Excel and gets Activeworkbook and worksheet
Excel.Application oXL;
Excel.Workbook oWB;
Excel.Worksheet oSheet;
oXL = (Excel.Application)Marshal.GetActiveObject("Excel.Application");
oXL.Visible = true;
oWB = (Excel.Workbook)oXL.ActiveWorkbook;
docProps = oWB.CustomDocumentProperties
Then I would try what you have and see how it works
Hope this helps

As #Govert explained above in his comment:
using Excel = Microsoft.Office.Interop.Excel;
using ExcelDna.Integration;
// Get the correct application instance
Excel.Application xlapp = (Excel.Application)ExcelDnaUtil.Application;
// Get active workbook
Excel.Workbook wbook = xlapp.ActiveWorkbook;

GetActiveObject() looks in the Running Object Table (ROT) and gives you the last Excel instance opened which may not corresponding with top Z order excel window.
Loop through the Z order and find the matching workbook.
See this link: -
https://social.msdn.microsoft.com/Forums/office/en-US/060000d8-a899-49bf-a965-0576dee958d4/how-to-get-active-application?forum=exceldev