# Write Excel

This script will require adding **using OfficeOpenXml;** to the namespaces section.

```csharp
ExcelWorksheet document = excelDocument.getWorkSheet(1);

for (int i=1;i<=NumberOfRows;i++)
{                               
      document.Cells[i, 1].Value=givenValue;
}
```

{% hint style="info" %}
The ExcelWorksheet variable has to be open using the “Open excel workbook” action before initializing the C# script, otherwise it will not be a valid reference to an Excel Workbook.

After the C# script action, use “Close excel workbook” to save the changes made.

{% endhint %}