Editing word table using C#

public static void CopyTableCells(string documentName, string sourceColumnName, string destinationColumnName)
{
    // Use the component in free mode.
    ComponentInfo.SetLicense("FREE-LIMITED-KEY");

    // Load a document from the file.
    var document = DocumentModel.Load(documentName, LoadOptions.DocxDefault);

    // Get the last table in the document.
    var table = (Table)document.GetChildElements(true, ElementType.Table).LastOrDefault();

    // Get source and destination column indices.
    int sourceColumnIndex = GetColumnIndex(table, sourceColumnName);
    int destinationColumnIndex = GetColumnIndex(table, destinationColumnName);

    // For each row, except header row - copy data from source cell to destination cell.
    for (int i = 1; i < table.Rows.Count; ++i)
    {
        var row = table.Rows[i];
        var sourceCell = row.Cells[sourceColumnIndex];
        var destinationCell = row.Cells[destinationColumnIndex];

        destinationCell.Blocks.Clear();
        foreach (var block in sourceCell.Blocks)
            destinationCell.Blocks.Add(block.Clone(true));
    }

    // Save the document to a file.
    document.Save("Document.docx", SaveOptions.DocxDefault);

    // Open a file with Microsoft Word.
    Process.Start("Document.docx");
}

// Utility method to get column index from column name.
private static int GetColumnIndex(Table table, string columnName)
{
    var headerRow = table.Rows[0];
    for (int i = 0; i < headerRow.Cells.Count; ++i)
        if (headerRow.Cells[i].Blocks.Cast<Paragraph>(0).Inlines.Cast<Run>(0).Text == columnName)
            return i;

    return -1;
}