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Font.Bold in table cell

Using the AlternatingRowsDemo.cs. The DocumentBuilder CellFormat methods work readily but the Font properties such as below do not. What is the correct approach to conditionally making a cell bold in the event handler?

// so we have to iterate over all cells in the row.
for (int colIdx = 0; colIdx < 4; colIdx++)
    mBuilder.MoveToCell(0, mRowIdx, colIdx, 0);
    mBuilder.Font.Bold = true; //add this one line to the demo - it has no effect here.
    mBuilder.CellFormat.Shading.BackgroundPatternColor = rowColor; //cool!

Thanks for your inquiry. Please try using the following code:

// Open document and create Documentbuilder
Document doc = new Document(@"Test120\in.doc");
DocumentBuilder builder = new DocumentBuilder(doc);
// Move documentBuilder cursor into the cell
builder.MoveToCell(0, 0, 0, 0);
// Get current cell
Cell currentCell = builder.CurrentNode.GetAncestor(NodeType.Cell) as Cell;
if (currentCell != null)
    // Get collection of runs in the cell
    NodeCollection runs = currentCell.GetChildNodes(NodeType.Run, true);
    // loop though all runs and change font
    foreach (Run run in runs)
        run.Font.Bold = true;
// Save output document

Hope this helps.
Best regards.