Hämta värdena i celler
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    OpenXML SDK
 string FilePath = @"..\..\..\..\Sample Files\";
string FileName = FilePath + "Retrieve the values of cells.xlsx";
// Retrieve the value in cell A1.
string value = GetCellValue(FileName, "Sheet1", "A1");
Console.WriteLine(value);
// Retrieve the value of a cell, given a file name, sheet name, 
// and address name.
public static string GetCellValue(string fileName,
string sheetName,
string addressName)
{
string value = null;
// Open the spreadsheet document for read-only access.
using (SpreadsheetDocument document =
    SpreadsheetDocument.Open(fileName, false))
{
    // Retrieve a reference to the workbook part.
    WorkbookPart wbPart = document.WorkbookPart;
    // Find the sheet with the supplied name, and then use that 
    // Sheet object to retrieve a reference to the first worksheet.
    Sheet theSheet = wbPart.Workbook.Descendants<Sheet>().
      Where(s => s.Name == sheetName).FirstOrDefault();
    // Throw an exception if there is no sheet.
    if (theSheet == null)
    {
        throw new ArgumentException("sheetName");
    }
    // Retrieve a reference to the worksheet part.
    WorksheetPart wsPart =
        (WorksheetPart)(wbPart.GetPartById(theSheet.Id));
    // Use its Worksheet property to get a reference to the cell 
    // whose address matches the address you supplied.
    Cell theCell = wsPart.Worksheet.Descendants<Cell>().
      Where(c => c.CellReference == addressName).FirstOrDefault();
    // If the cell does not exist, return an empty string.
    if (theCell != null)
    {
        value = theCell.InnerText;
        // If the cell represents an integer number, you are done. 
        // For dates, this code returns the serialized value that 
        // represents the date. The code handles strings and 
        // Booleans individually. For shared strings, the code 
        // looks up the corresponding value in the shared string 
        // table. For Booleans, the code converts the value into 
        // the words TRUE or FALSE.
        if (theCell.DataType != null)
        {
            switch (theCell.DataType.Value)
            {
                case CellValues.SharedString:
                    // For shared strings, look up the value in the
                    // shared strings table.
                    var stringTable =
                        wbPart.GetPartsOfType<SharedStringTablePart>()
                        .FirstOrDefault();
                    // If the shared string table is missing, something 
                    // is wrong. Return the index that is in
                    // the cell. Otherwise, look up the correct text in 
                    // the table.
                    if (stringTable != null)
                    {
                        value =
                            stringTable.SharedStringTable
                            .ElementAt(int.Parse(value)).InnerText;
                    }
                    break;
                case CellValues.Boolean:
                    switch (value)
                    {
                        case "0":
                            value = "FALSE";
                            break;
                        default:
                            value = "TRUE";
                            break;
                    }
                    break;
            }
        }
    }
}
return value;
}
Aspose.Cells
 string FilePath = @"..\..\..\..\Sample Files\";
string FileName = FilePath + "Retrieve the values of cells.xlsx";
// Retrieve the value in cell A1.
string value = GetCellValue(FileName, "Sheet1", "A1");
Console.WriteLine(value);
Console.ReadKey();
// Retrieve the value of a cell, given a file name, sheet name, 
// and address name.
public static string GetCellValue(string fileName,
    string sheetName,
    string addressName)
{
    //Instantiating a Workbook object
    Workbook workbook = new Workbook(fileName);
    //Obtaining the reference of the Active worksheet
    Worksheet worksheet = workbook.Worksheets.GetSheetByCodeName(sheetName);
    //retrieve value from cell
    string returnValue = worksheet.Cells[addressName].Value.ToString();
    return returnValue;
}