FormulaEngineer examples

Create, read, and style Excel workbooks in .NET.

Style workbooks as you write them — fonts, fills, borders, number formats, alignment, and layout — using ExcelStyledWriter. Every example below is a complete, runnable snippet.

Group

Cells and text 10 Layout 10 Conditional formatting 6 Named styles and themes 4 Tables and notes 10 Images and shapes 4 Charts and sparklines 6 Dashboards 4

Example

6 examples in Conditional formatting

Highlight values above a threshold

EnableConditionalFormatting

The simplest conditional format — a cell-value rule that bolds and tints every revenue figure above 1000, evaluated by Excel when the file opens rather than baked in at write time.

Write.cs

using FormulaEngineer.Api;
using FormulaEngineer.Api.Styling;

var stylingOptions =
    new ExcelStylingOptions
    {
        EnableConditionalFormatting = true
    };

var highValueStyle =
    ExcelStyle.Default.With(
        font: ExcelFontStyle.Default.With(bold: true),
        fill: ExcelFillStyle.Solid(ExcelColor.FromRgb(226, 239, 218)));

using (var writer = new ExcelStyledWriter("greater-than-threshold-format.xlsx", null, stylingOptions))
{
    using (var sheet = writer.CreateWorksheet("Sales"))
    {
        sheet.WriteRow("Region", "Revenue");
        sheet.WriteRow("North", 1250);
        sheet.WriteRow("South", 920);
        sheet.WriteRow("West", 1480);
        sheet.WriteRow("East", 760);

        sheet.AddConditionalFormat(
            "B2:B5",
            ExcelConditionalFormat.CellValue(
                ExcelConditionalFormatOperator.GreaterThan,
                "1000",
                style: highValueStyle));
    }

    writer.Close();
}

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Style your own workbooks

Styling is part of the same package — no separate install, no Excel, no COM automation.

Get FormulaEngineer on NuGet Contact for styling questions