read excel sheet cell values

i am using .net frame work 2.0

i am using following code for read excel worksheet.  i want to do couple of changes in this code.

1. open the existing excel sheet in the given path (below code is creating new sheet . i do not want to create new sheet )
2.  Read all the values in the sheet and assign the values to the dataTable  

Let me know how to do this ?

private void button2_Click(object sender, EventArgs e)
            Excel.Application excelApp = new Excel.Application();  // Creates a new Excel Application
            excelApp.Visible = true;  // Makes Excel visible to the user.

            // The following line if uncommented adds a new workbook
            //Excel.Workbook newWorkbook = excelApp.Workbooks.Add();

            // The following code opens an existing workbook
            string workbookPath = "c:/temp/SomeWorkBook.xlsx";  // Add your own path here

            Excel.Workbook excelWorkbook = null;

                excelWorkbook = excelApp.Workbooks.Open(workbookPath, 0,
                    false, 5, "", "", false, Excel.XlPlatform.xlWindows, "",true, 
                    false, 0,true, false, false);
                //Create a new workbook if the existing workbook failed to open.
                //excelWorkbook = excelApp.Workbooks.Add();

            // The following gets the Worksheets collection
            Excel.Sheets excelSheets = excelWorkbook.Worksheets;

            // The following gets Sheet1 for editing
            string currentSheet = "Sheet1";
            Excel.Worksheet excelWorksheet = (Excel.Worksheet)excelSheets.get_Item(currentSheet);

            // The following gets cell A1 for editing
           // Excel.Range excelCell = (Excel.Range)excelWorksheet.get_Range("A1", "A1");
            string cell = (string)(excelWorksheet.Cells[1, 1] as Excel.Range).Text;
            // The following sets cell A1's value to "Hi There"
            //excelCell.Value2 = "Hi There";

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Varshini SAsked:
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pls try

        Excel.Application xlApp;
        Excel.Workbook xlWorkBook;
        Excel.Worksheet xlWorkSheet;
        string workbookPath = "c:\temp\SomeWorkBook.xlsx";
        xlApp = new Excel.Application();
        xlWorkBook = xlApp.Workbooks.Open(workbookPath , Type.Missing, false, Type.Missing,
                Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
        xlApp.Visible = true;
        xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
        object value =  xlWorkSheet.UsedRange.Value;

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Varshini SAuthor Commented:
i do not want to open the excel sheet. i want to read behind the scenes.

xlApp.Visible = false;
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