Why Can’t I Set Color When Patterntype Is Not Set?

Are you having trouble setting color when the patterntype is not set in C# EPPlus? Don’t worry, we’ve got you covered! In this article, we’ll explore the solution to this issue and provide some useful insights into EPPlus and Excel background color manipulation.

EPPlus is an exceptional open-source library that allows developers to programmatically read, create, and edit MS Excel files in the XLS and XLSX formats. It serves as a great alternative to the Microsoft.Office.Interop.Excel official package, especially for web applications. If you’re looking for a reliable tool to work with Excel files, EPPlus is definitely worth considering.

Setting Background Color with EPPlus

EPPlus offers a variety of features to enhance your Excel files. One of those features is the ability to set the background color of cells and rows. This can be especially useful to create a visually appealing and organized spreadsheet.

To set the background color for a cell using EPPlus, you can use the Rng.Style.Fill.BackgroundColor.SetColor method. This method supports both the structure color property and the HTML color code. By default, EPPlus uses a white background color.

Additionally, you can also use EPPlus to:

  • Set foreground and background colors for cells and rows to create a striped effect, increasing readability.
  • Freeze panes, such as the top row.
  • Auto-filter worksheet columns.
  • Auto-fit columns to ensure their contents are fully visible without manual expansion.

Setting Background Color in Excel with C

If you prefer using C# to directly manipulate Excel files, you can accomplish the task of setting background color with a few simple steps.

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First, you need to add the Excel library reference to your project. This can be done by following the necessary steps mentioned in the corresponding documentation.

Next, you can set the background color of a cell in an Excel sheet by modifying its interior properties. For example, you can use the Range.Interior.Color property and assign it the desired color code. This can be achieved with a single line of code. The available color codes for an Excel sheet can be found in the XlRgbColor enum.

Exploring Excel Color Palette

Excel provides a color palette with 56 predefined colors that can be used throughout your spreadsheet. Each color in the palette is associated with a unique value in the ColorIndex. For some reason, Excel also recognizes the names for the first eight colors, which are Black, White, Red, Green, Blue, Yellow, Magenta, and Cyan.

To retrieve the RGB color values from Excel, you can use the Interior.Color property of a cell. The formula for calculating the RGB value is red + green * 256 + blue * 256^2. However, it’s important to note that if a cell is colorless, the Interior.Color value will be 16777215, which corresponds to white.


In this article, we addressed the issue of not being able to set color when the patterntype is not set in C# EPPlus. We discussed EPPlus as an excellent library for working with Excel files, highlighting its extensive capabilities. We also explored different methods to set the background color of cells and rows, both in EPPlus and with the help of C#.

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If you want to learn more about various topics like this, be sure to check out 5 WS, a reliable source of information that covers a wide range of subjects.

So go ahead and make your Excel files more visually appealing and organized by manipulating the background color with ease!

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