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Excel styles and formatting in C# and VB.NET

With the GemBox.Spreadsheet library, you can set various style and format options like alignment, indentation, borders, and font-related properties on Excel rows, columns, and cells in C# and VB.NET.

Table of contents

Basic formatting example

The following example applies one piece of formatting at each scope:

  • A font on a cell.

  • A fill on a row.

  • A border on a column.

using GemBox.Spreadsheet;

// If using the Professional version, put your serial key below.
SpreadsheetInfo.SetLicense("FREE-LIMITED-KEY");

var workbook = new ExcelFile();
var worksheet = workbook.Worksheets.Add("Styles");

// Format a single cell: a bold, colored font.
worksheet.Cells["B2"].Value = "Cell";
worksheet.Cells["B2"].Style.Font.Weight = ExcelFont.BoldWeight;
worksheet.Cells["B2"].Style.Font.Color = SpreadsheetColor.FromName(ColorName.Red);

// Format an entire row: a solid background fill.
worksheet.Cells["B4"].Value = "Row";
worksheet.Rows[3].Style.FillPattern.SetSolid(SpreadsheetColor.FromName(ColorName.LightBlue));

// Format an entire column: a left border.
worksheet.Cells["D2"].Value = "Column";
worksheet.Columns[3].Style.Borders.SetBorders(MultipleBorders.Left,
    SpreadsheetColor.FromName(ColorName.Black), LineStyle.Medium);

workbook.Save("Styles and Formatting.xlsx");
Imports GemBox.Spreadsheet

Module Program

    Sub Main()
        ' If using the Professional version, put your serial key below.
        SpreadsheetInfo.SetLicense("FREE-LIMITED-KEY")

        Dim workbook As New ExcelFile()
        Dim worksheet = workbook.Worksheets.Add("Styles")

        ' Format a single cell: a bold, colored font.
        worksheet.Cells("B2").Value = "Cell"
        worksheet.Cells("B2").Style.Font.Weight = ExcelFont.BoldWeight
        worksheet.Cells("B2").Style.Font.Color = SpreadsheetColor.FromName(ColorName.Red)

        ' Format an entire row: a solid background fill.
        worksheet.Cells("B4").Value = "Row"
        worksheet.Rows(3).Style.FillPattern.SetSolid(SpreadsheetColor.FromName(ColorName.LightBlue))

        ' Format an entire column: a left border.
        worksheet.Cells("D2").Value = "Column"
        worksheet.Columns(3).Style.Borders.SetBorders(MultipleBorders.Left, SpreadsheetColor.FromName(ColorName.Black), LineStyle.Medium)

        workbook.Save("Styles and Formatting.xlsx")
    End Sub

End Module
Excel cell, row, and column formatting created with GemBox.Spreadsheet
Screenshot of font, fill, and border formatting applied to an Excel cell, a row, and column in C#

Format the font

You can use the CellStyle.Font property to format the font in a cell, row, or column.

var cell = worksheet.Cells["B2"];
cell.Value = "Formatted text";

cell.Style.Font.Name = "Arial";
cell.Style.Font.Size = 14 * 20; // Size is in twips (1/20 pt), so 14 pt.
cell.Style.Font.Weight = ExcelFont.BoldWeight;
cell.Style.Font.Italic = true;
cell.Style.Font.UnderlineStyle = UnderlineStyle.Single;
cell.Style.Font.Color = SpreadsheetColor.FromName(ColorName.Blue);
cell.Style.Font.Strikeout = true;
Dim cell = worksheet.Cells("B2")
cell.Value = "Formatted text"

cell.Style.Font.Name = "Arial"
cell.Style.Font.Size = 14 * 20 ' Size is in twips (1/20 pt), so 14 pt.
cell.Style.Font.Weight = ExcelFont.BoldWeight
cell.Style.Font.Italic = True
cell.Style.Font.UnderlineStyle = UnderlineStyle.Single
cell.Style.Font.Color = SpreadsheetColor.FromName(ColorName.Blue)
cell.Style.Font.Strikeout = True
Excel cell font formatting (Arial, bold, italic, underlined, blue) created with GemBox.Spreadsheet
Formatted font in an Excell sheet, done programmatically

Fill the background

Using the CellStyle.FillPattern property, you can format the fill with a solid color, a pattern, or a gradient.

// A solid fill.
worksheet.Cells["B2"].Style.FillPattern.SetSolid(
    SpreadsheetColor.FromName(ColorName.Green));

// A two-color pattern fill.
worksheet.Cells["B4"].Style.FillPattern.SetPattern(
    FillPatternStyle.HorizontalStripe,
    SpreadsheetColor.FromName(ColorName.Green),
    SpreadsheetColor.FromName(ColorName.Yellow));

// A two-color gradient fill.
worksheet.Cells["B6"].Style.FillPattern.SetGradient(
    GradientShadingStyle.HorizontalHigh,
    SpreadsheetColor.FromName(ColorName.Green),
    SpreadsheetColor.FromName(ColorName.Yellow));
' A solid fill - the common case for a cell background.
worksheet.Cells("B2").Style.FillPattern.SetSolid(SpreadsheetColor.FromName(ColorName.Green))

' A two-color pattern fill.
worksheet.Cells("B4").Style.FillPattern.SetPattern(FillPatternStyle.HorizontalStripe, SpreadsheetColor.FromName(ColorName.Green), SpreadsheetColor.FromName(ColorName.Yellow))

' A two-color gradient fill.
worksheet.Cells("B6").Style.FillPattern.SetGradient(GradientShadingStyle.HorizontalHigh, SpreadsheetColor.FromName(ColorName.Green), SpreadsheetColor.FromName(ColorName.Yellow))
Excel cell solid, pattern, and gradient fills created with GemBox.Spreadsheet
Excell cells with different background fills created in C#

Align and wrap the content

CellStyle.HorizontalAlignment and CellStyle.VerticalAlignment position the content within the cell, and CellStyle.WrapText breaks long text onto multiple lines.

// Center the content horizontally and vertically.
var cell = worksheet.Cells["B2"];
cell.Value = "Centered";
cell.Style.HorizontalAlignment = HorizontalAlignmentStyle.Center;
cell.Style.VerticalAlignment = VerticalAlignmentStyle.Center;

// Increase the width and height to make the centering visible.
worksheet.Rows[1].SetHeight(50, LengthUnit.Point);
worksheet.Columns[1].SetWidth(100, LengthUnit.Point);

// Wrap long text onto multiple lines inside the cell.
var wrapped = worksheet.Cells["B4"];
wrapped.Value = "This long text wraps onto several lines inside the cell.";
wrapped.Style.WrapText = true;
' Center the content horizontally and vertically.
Dim cell = worksheet.Cells("B2")
cell.Value = "Centered"
cell.Style.HorizontalAlignment = HorizontalAlignmentStyle.Center
cell.Style.VerticalAlignment = VerticalAlignmentStyle.Center

' Increase the width and height to make the centering visible.
worksheet.Rows(1).SetHeight(50, LengthUnit.Point)
worksheet.Columns(1).SetWidth(100, LengthUnit.Point)

' Wrap long text onto multiple lines inside the cell.
Dim wrapped = worksheet.Cells("B4")
wrapped.Value = "This long text wraps onto several lines inside the cell."
wrapped.Style.WrapText = True
Excel cell centered alignment and wrapped text created with GemBox.Spreadsheet
Center-aligned and wrapped text in Excel cells, done in C#

Rotate and stack text

CellStyle.Rotation rotates the text by an angle from -90 to 90 degrees, while CellStyle.IsTextVertical stacks the letters from top to bottom.

// Rotate the text by an angle between -90 and 90 degrees.
worksheet.Cells["B2"].Value = "Rotated";
worksheet.Cells["B2"].Style.Rotation = 45;

// Stack the letters vertically.
worksheet.Cells["D2"].Value = "Vertical";
worksheet.Cells["D2"].Style.IsTextVertical = true;
' Rotate the text by an angle between -90 and 90 degrees.
worksheet.Cells("B2").Value = "Rotated"
worksheet.Cells("B2").Style.Rotation = 45

' Stack the letters vertically.
worksheet.Cells("D2").Value = "Vertical"
worksheet.Cells("D2").Style.IsTextVertical = True
Excel cell rotated and vertical text created with GemBox.Spreadsheet
Programmatically rotated and stacked text in cells in Excel

Add and remove borders

You can define cell borders using the CellStyle.Borders.SetBorders method. This allows you to specify which borders to modify, along with their color and line style.

worksheet.Cells["B2"].Style.Borders.SetBorders(
    MultipleBorders.All,
    SpreadsheetColor.FromName(ColorName.Black),
    LineStyle.Thick);
worksheet.Cells("B2").Style.Borders.SetBorders(
    MultipleBorders.All,
    SpreadsheetColor.FromName(ColorName.Black),
    LineStyle.Thick)
Excel cell borders created with GemBox.Spreadsheet
An Excell cell with borders defined in C#

The first parameter of the SetBorders method specifies which borders are affected. For example, to remove the right border, use MultipleBorders.Right with LineStyle.None.

worksheet.Cells["B2"].Style.Borders.SetBorders(
    MultipleBorders.Right,
    SpreadsheetColor.FromName(ColorName.Black),
    LineStyle.None);
worksheet.Cells("B2").Style.Borders.SetBorders(
    MultipleBorders.Right,
    SpreadsheetColor.FromName(ColorName.Black),
    LineStyle.None)
Excel cell borders removed with GemBox.Spreadsheet
Custom Excell cell borders in C#

Built-in, custom, and default styles

Instead of formatting each cell individually, you can format a Style instance and assign it to cells, rows, or columns. You can choose one of the following style types:

  • Normal style - The default style available via the ExcelFile.Styles.Normal property that every cell inherits.

  • Built-in, named style - One of the built-in styles listed in the BuiltInCellStyleName enumeration.

  • Custom style - A style with a custom name and formatting.

The following code examples show how to use all three types of styles and how to apply them to a row and a range of cells.

// Change the default style, which every cell inherits.
workbook.Styles.Normal.FillPattern.SetSolid(SpreadsheetColor.FromName(ColorName.LightBlue));
        
// Apply a built-in style to a whole row.
worksheet.Rows[1].Style = workbook.Styles[BuiltInCellStyleName.Good];

// Create a reusable custom style and apply it to a range.
var orangeStyle = workbook.Styles.Add("Highlight");
orangeStyle.Font.Weight = ExcelFont.BoldWeight;
orangeStyle.FillPattern.SetSolid(SpreadsheetColor.FromName(ColorName.Orange));
worksheet.Cells.GetSubrange("B4:D4").Style = orangeStyle;
' Change the default style, which every cell inherits.
workbook.Styles.Normal.FillPattern.SetSolid(SpreadsheetColor.FromName(ColorName.LightBlue))

' Apply a built-in style to a whole row.
worksheet.Rows(1).Style = workbook.Styles(BuiltInCellStyleName.Good)

' Create a reusable custom style and apply it to a range.
Dim orangeStyle = workbook.Styles.Add("Highlight")
orangeStyle.Font.Weight = ExcelFont.BoldWeight
orangeStyle.FillPattern.SetSolid(SpreadsheetColor.FromName(ColorName.Orange))
worksheet.Cells.GetSubrange("B4:D4").Style = orangeStyle
Excel built-in, custom, and default styles applied with GemBox.Spreadsheet
Different styles of Excel cells created in C# or VB.NET

Work with colors

Every color - whether for the font, the fill, or a border - is an instance of SpreadsheetColor. There are three ways to make one:

  • By name from the ColorName enumeration.

  • From RGB components.

  • From a hex string.

// A theme color, by name.
worksheet.Cells["B2"].Style.Font.Color = SpreadsheetColor.FromName(ColorName.Red);

// A custom color, from RGB components.
worksheet.Cells["B4"].Style.Font.Color = SpreadsheetColor.FromArgb(0, 112, 192);

// A custom color, from a hex string.
worksheet.Cells["B6"].Style.Font.Color = SpreadsheetColor.FromArgb(0x8C001A);
' A theme color, by name.
worksheet.Cells("B2").Style.Font.Color = SpreadsheetColor.FromName(ColorName.Red)

' A custom color, from RGB components.
worksheet.Cells("B4").Style.Font.Color = SpreadsheetColor.FromArgb(0, 112, 192)

' A custom color, from a hex string.
worksheet.Cells("B6").Style.Font.Color = SpreadsheetColor.FromArgb(0x8C001A)

This example covers whole-cell formatting. A few related operations have their own articles:

Frequently asked questions

How do I set the background color of a cell?

There is no "background color" property - set the solid fill instead.

worksheet.Cells["B2"].Style.FillPattern.SetSolid(
    SpreadsheetColor.FromName(ColorName.Green));
worksheet.Cells("B2").Style.FillPattern.SetSolid(SpreadsheetColor.FromName(ColorName.Green))

How do I get a cell's existing formatting?

Read the formatting from the ExcelCell.Style property.

var fontName = worksheet.Cells["A1"].Style.Font.Name;
var horizontalAlignment = worksheet.Cells["A1"].Style.HorizontalAlignment;
Dim fontName = worksheet.Cells("A1").Style.Font.Name
Dim horizontalAlignment = worksheet.Cells("A1").Style.HorizontalAlignment

Why did applying a style erase my other formatting?

Assigning a brand-new CellStyle object to a cell replaces all of its formatting.

// Assigning a CellStyle object replaces all existing formatting with default values.
worksheet.Cells["B2"].Style = new CellStyle()
{
    HorizontalAlignment = HorizontalAlignmentStyle.Center
};
        
// Changing individual properties keeps existing formatting.
worksheet.Cells["B2"].Style.HorizontalAlignment = HorizontalAlignmentStyle.Center;
' Assigning a CellStyle object replaces all existing formatting with default values.
worksheet.Cells("B2").Style = New CellStyle() With {
.HorizontalAlignment = HorizontalAlignmentStyle.Center
}

' Changing individual properties keeps existing formatting.
worksheet.Cells("B2").Style.HorizontalAlignment = HorizontalAlignmentStyle.Center

How do I change the formatting for the whole workbook?

Change the Normal style, which every cell inherits.

workbook.Styles.Normal.Font.Name = "Calibri";
workbook.Styles.Normal.Font.Name = "Calibri"

How do I copy formatting from one cell to another?

The ExcelCell.Style property has both a getter and a setter method, so you can take formatting from one cell and assign it to another cell.

// Copy a whole cell's formatting to another cell.
worksheet.Cells["B2"].Style = worksheet.Cells["A1"].Style;

// Or copy it to an entire range.
worksheet.Cells.GetSubrange("B4", "D4").Style = worksheet.Cells["A1"].Style;
' Copy a whole cell's formatting to another cell.
worksheet.Cells("B2").Style = worksheet.Cells("A1").Style

' Or copy it to an entire range.
worksheet.Cells.GetSubrange("B4", "D4").Style = worksheet.Cells("A1").Style

See also

Excel cell inline text formatting in C# and VB.NET Excel cell inline text formatting in C# and VB.NET Excel cell number format in C# and VB.NET Excel cell number format in C# and VB.NET

Next steps

GemBox.Spreadsheet is a .NET library that enables you to read, write, edit, convert, and print spreadsheet files from your .NET applications using one simple API.

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