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Excel Background Image, one kind of page layout setting, is used to beautify files. Actually, with a beautiful background image, the Excel file will be more attractive to readers. Also, different from inserting image in Excel directly, background image will not cover data information. It means that all the data in Excel can be displayed even though background image is inserted.

Spire.XLS for WPF, a professional component to operate Excel files in WPF applications, enables users to insert background image in Excel. This guide will focus on how to realize this function by using C#, VB.NET.

Assign value for BackgroundImage property of PageSetup in Worksheet class to insert background image. Because the type of BackgroundImage is Bitmap, so the assigned value must be bitmap image. The following screenshot shows result after inserting background image.

Download and install Spire.XLS for WPF. Then add a button in MainWindow. Double click the button to use the following code to insert background image in Excel.

         Bitmap bm = new Bitmap(Image.FromFile(@"E:\Work\Documents\SampleImage\Flower.jpg"));
            sheet.PageSetup.BackgoundImage = bm;

         Dim bm As New Bitmap(Image.FromFile("E:\Work\Documents\SampleImage\Flower.jpg"))
        sheet.PageSetup.BackgoundImage = bm

Spire.XLS allows user to operate Excel document directly such as save to stream, save as web response, copy, lock/unlock worksheet, set up workbook properties, etc. As a professional WPF/.NET/Silverlight Excel component, it owns the ability of inserting content into Excel document, formatting cells and converting Excel documents to popular office file formats. Spire.XLS for WPF supports Excel 97-2003, Excel 2007 and Excel 2010.

This section will show you a detail solution to easily convert RTF to HTML in your WPF application via a .NET Word component. Only two lines of core code in total will be used to realize your RTF to HTML task in this solution.

Spire.Doc for WPF, as a professional MS Word component on WPF, enables you to accomplish RTF to HTML task through following two methods: Document.LoadFromFile(string fileName, FileFormat fileFormat) called to load your RTF file from system and Document. SaveToFile(string ilename, FileFormat fileFormat) is used to save the RTF file as HTML.

Now, you can download Spire.Doc for WPF and then, view the effect of RTF to HTML task as below picture:

Sample Code:

using Spire.Doc;
using Spire.Doc.Documents;

namespace wpfrtftohtml
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            //Load RTF file
            Document document = new Document();
            document.LoadFromFile(@"..\wpfrtftohtml.rtf", FileFormat.Rtf);
            //Convert rtf to html
            document.SaveToFile("rtftohtml.html", FileFormat.Html);
        }
    }
}

Imports Spire.Doc
Imports Spire.Doc.Documents

Namespace wpfrtftohtml
    
    Public Class MainWindow
        Inherits Window
        Public Sub New()
            MyBase.New
            InitializeComponent
        End Sub
        
        Private Sub button1_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
            'Load RTF file
            Dim document As Document = New Document
            document.LoadFromFile("..\wpfrtftohtml.rtf", FileFormat.Rtf)
            'Convert rtf to html
            document.SaveToFile("rtftohtml.html", FileFormat.Html)
        End Sub
    End Class
End Namespace