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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.

Excel Interop - Set filename before saving

Is it possible to set the excel filename before file saving?
I have following simple code:
using Excel = Microsoft.Office.Interop.Excel;
Excel.Application excel = new Excel.Application();
excel.Visible = true;
Excel.Workbook workbook = excel.Workbooks.Add(Excel.XlSheetType.xlWorksheet);
Excel.Worksheet sheet = workbook.Sheets[1];
sheet.Cells[1, 1] = "Hello World!";
Is it possible to predefine this name before saving?
Thanks.

There is no explicit, foolproof way to do this prior to saving, unfortunately. The closest you could come is to use a template. If you have a template called FOO.xltx, you could create your workbook like this:
Application.Workbooks.Add "X:\path\to\FOO.xltx"
The only quirk is that the name for the new documents will be appended with an incrementing number (FOO1 the first time, then FOO2,FOO3, etc.).
To create a template, just create a new document, and when you save it, select Excel Template (*.xltx) from the Save as type dropdown.

You have to use saveas to save the file with the filename you want. Then when the user clicks save it will just update the file that was previously created. Unfortunately there is no other way. Here is the code:
workbook.SaveAs(Filename: FILENAMEHERE);
Here is the MSDN doc for it: https://msdn.microsoft.com/en-us/library/microsoft.office.tools.excel.workbook.saveas.aspx

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.

Save Entire Workbook as PDF Excel 2010 (C#)

Is there anyway to save you entire workbook as a pdf in excel. I found this, http://msdn.microsoft.com/en-us/library/bb407651(v=office.12).aspx, but it does not exactly tell you if it saves the entire workbook as a pdf or just the active sheet. If there is no way to save the entire workbook to pdf, would printing the entire workbook be the best option, or even possible in C#? Below is what I have thus far I just need it to save as pdf so I can send in an email. Thanks for the help.
using Excel = Microsoft.Office.Interop.Excel; //Excel Reference
//Gets Excel and gets Activeworkbook and worksheet
Excel.Application oXL;
Excel.Workbook oWB;
Excel.Worksheet oSheet;
//Create New Instance in Excel
oXL = new Excel.Application();
oXL.Visible = true;
//Open Excel Workbook
oWB = oXL.Workbooks.Open("");
oWB = (Excel.Workbook)oXL.ActiveWorkbook;
oSheet = (Excel.Worksheet)oWB.ActiveSheet;
//Modify Excel Spreadsheet Based on Form
oSheet.Cells[6, 4] = maskedTextBox1.Text; //Change Value in Cell, Cell Location [y-axis, x-axis]
//Save Workbook As
oWB.SaveAs("");
//Save Workbook As PDF
//Close Workbook
oWB.Close("");
//Quit Excel
oXL.Quit();

In 2010 you can save the entire workbook in PDF by making each sheet an "Active" sheet.
Sounds strange but if you notice the print options when you do a pdf there is no option for workbook. To get around this open an excel file and fill in some data in 2-3 work sheets. Now hold your ctrl key and click on each other workbook, it will then become a "Group".
You will notice the [GROUP] name appear at the top of the excel file and now when you print the excel file it will print the entire workbook.
Try this out for yourself. In code, you just need to make each work sheet an active worksheet. I don't work much with the excel object model but it might be worth doing a macro for this and looking at the code.
I recorded a macro and here is the VBA:
Sheets(Array("Sheet1", "Sheet2", "Sheet3")).Select
Looks as though you just need to store each sheet in an array and then simply
Sheets(MyArray).Select
This will then make all sheets active and [grouped] and then you can run a print out to pdf. By recording the macro it also presented the options to print to pdf:
`ActiveSheet.ExportAsFixedFormat Type:=xlTypePDF, Filename:= _
"C:\Users\MyAccount\Desktop\test.pdf", Quality:=xlQualityStandard, _
IncludeDocProperties:=True, IgnorePrintAreas:=False, OpenAfterPublish:= _
True`
In this case active sheet is your group of sheets that you have stored in an array.

Set Margins In Excel Using Excel Interop VB.Net

Anyone have code to set margins(top,left,right,bottom) using excel interop and vb.net. I think it must be part of the worksheet object but maybe the workbook object. Having a tough time finding an example. Thanks in advance.

I found it its part of the worksheet object...
i.e.
xlWorkSheet.PageSetup.TopMargin=0.5

Margins are set through the PageSetup object which you get from on the WorkSheet.PageSetup property.

Margin values have to mentioned in points. Use InchesToPoints(Double) or CentimetersToPoints(Double) to specify the value.
Eg:
Microsoft.Office.Interop.Excel.Application _ExcelAppl = new Microsoft.Office.Interop.Excel.Application();
Microsoft.Office.Interop.Excel.Workbook _ExcelWorkBook = oXL.Workbooks.Add(missing);
Microsoft.Office.Interop.Excel.Worksheet _ExcelWorkSheet = oWB.ActiveSheet as Microsoft.Office.Interop.Excel.Worksheet;
_ExcelWorkSheet.PageSetup.TopMargin = _ExcelAppl.InchesToPoints(0.25);