C#/VB.NET: Highlight Text in PowerPoint

When creating a PowerPoint presentation, you may want to ensure that some important content in your presentation grabs the audience’s attention. A great way to make the content more prominent and noticeable is to highlight it with a bright color. This article will demonstrate how to highlight text in a PowerPoint presentation in C# and VB.NET using Spire.Presentation for .NET.

Install Spire.Presentation for .NET

To begin with, you need to add the DLL files included in the Spire.Presentation for.NET package as references in your .NET project. The DLL files can be either downloaded from this link or installed via NuGet.

PM> Install-Package Spire.Presentation

Highlight Text in PowerPoint in C# and VB.NET

The following are the steps to highlight specific text in a PowerPoint document:

  • Initialize an instance of Presentation class.
  • Load a PowerPoint presentation using Presentation.LoadFromFile() method.
  • Loop through the slides in the presentation and the shapes on each slide.
  • Check if the current shape is of IAutoShape type.
  • If the result is true, typecast it to IAutoShape.
  • Initialize an instance of TextHighLightingOptions class, and set the text highlighting options such as whole words only and case sensitive through TextHighLightingOptions.WholeWordsOnly and TextHighLightingOptions.CaseSensitive properties.
  • Highlight a specific text in the shape using IAutoShape.TextFrame.HighLightText() method.
  • Save the result file using Presentation.SaveToFile() method.
  • C#
  • VB.NET
using Spire.Presentation;
using System.Drawing;

namespace HighlightTextInPPT
    class Program
        static void Main(string[] args)
            //Create an instance of Presentation class
            Presentation presentation = new Presentation();
            //Load a PowerPoint file

            //Loop through all slides 
            for (int i = 0; i < presentation.Slides.Count; i++)
                //Get the current slide
                ISlide slide = presentation.Slides[i];
                //Loop through the shapes on the slide
                for (int j = 0; j < slide.Shapes.Count; j++)
                    //Check if the current shape is of IAutoShape type
                    if (slide.Shapes[j] is IAutoShape)
                        //Typecast the shape to IAutoShape
                        IAutoShape shape = slide.Shapes[j] as IAutoShape;

                        //Create an instance of TextHighLightingOptions class
                        TextHighLightingOptions options = new TextHighLightingOptions();
                        //Set text highlighting options
                        options.CaseSensitive = true;
                        options.WholeWordsOnly = true;

                        //Highlight specific text within the shape with color
                        shape.TextFrame.HighLightText("Spire.Presentation", Color.LightYellow, options);


            //Save the result file
            presentation.SaveToFile("HighlightText.pptx", FileFormat.Pptx2013);

C#/VB.NET: Highlight Text in PowerPoint

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