Update Cell value in Excel Spreadsheet using C# (Open XML and EPPlus library)

Sharing a sample code that updates a particular cell’s value in Excel Spreadsheet.

Here we are updating cell B4

First using Open XML SDK

public static void UpdateExcelUsingOpenXMLSDK(string fileName)
{
// Open the document for editing.
using (SpreadsheetDocument spreadSheet = SpreadsheetDocument.Open(fileName, true))
{
// Access the main Workbook part, which contains all references.
WorkbookPart workbookPart = spreadSheet.WorkbookPart;
// get sheet by name
Sheet sheet = workbookPart.Workbook.Descendants<Sheet>().Where(s => s.Name == "Sheet1").FirstOrDefault();

// get worksheetpart by sheet id
WorksheetPart worksheetPart = workbookPart.GetPartById(sheet.Id.Value) as WorksheetPart;

// The SheetData object will contain all the data.
SheetData sheetData = worksheetPart.Worksheet.GetFirstChild();

Cell cell = GetCell(worksheetPart.Worksheet, "B", 4);

cell.CellValue = new CellValue("10");
cell.DataType = new EnumValue<CellValues>(CellValues.Number);

// Save the worksheet.
worksheetPart.Worksheet.Save();

// for recacluation of formula
spreadSheet.WorkbookPart.Workbook.CalculationProperties.ForceFullCalculation = true;
spreadSheet.WorkbookPart.Workbook.CalculationProperties.FullCalculationOnLoad = true;

}
}

private static Cell GetCell(Worksheet worksheet,
string columnName, uint rowIndex)
{
Row row = GetRow(worksheet, rowIndex);

if (row == null) return null;

var FirstRow = row.Elements<Cell>().Where(c => string.Compare
(c.CellReference.Value, columnName +
rowIndex, true) == 0).FirstOrDefault();

if (FirstRow == null) return null;

return FirstRow;
}

private static Row GetRow(Worksheet worksheet , uint rowIndex)
{
Row row = worksheet.GetFirstChild<SheetData>().
Elements<Row>().FirstOrDefault(r => r.RowIndex == rowIndex);
if (row == null)
{
throw new ArgumentException(String.Format("No row with index {0} found in spreadsheet", rowIndex));
}
return row;
}

Now the same code using EPPlus

https://www.nuget.org/packages/EPPlus/

public void UpdateExcelUsingEPPlus(string fileName)
{
FileInfo fileInfo = new FileInfo(fileName);
ExcelPackage p = new ExcelPackage(fileInfo);
ExcelWorksheet myWorksheet = p.Workbook.Worksheets["Sheet1"];
myWorksheet.Cells[4, 2].Value = 10;
p.Save();

}

Hope it helps..