923107: Added proper code example for replacing existing image in PDF

Redaction/Replace-existing-text-in-a-PDF/.NET Framework/Replace-existing-text-in-a-PDF.slnx

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+<Solution>
+  <Project Path="Replace-existing-text-in-a-PDF/Replace-existing-text-in-a-PDF.csproj" Id="27ffc4d8-a2ca-4a30-aba0-80a4db3a1895" />
+</Solution>

Redaction/Replace-existing-text-in-a-PDF/.NET Framework/Replace-existing-text-in-a-PDF/App.config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8" />
+    </startup>
+  <runtime>
+    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
+      <dependentAssembly>
+        <assemblyIdentity name="System.Runtime.CompilerServices.Unsafe" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
+      </dependentAssembly>
+      <dependentAssembly>
+        <assemblyIdentity name="System.Memory" publicKeyToken="cc7b13ffcd2ddd51" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-4.0.1.2" newVersion="4.0.1.2" />
+      </dependentAssembly>
+      <dependentAssembly>
+        <assemblyIdentity name="Syncfusion.Licensing" publicKeyToken="632609b4d040f6b4" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-32.2462.5.0" newVersion="32.2462.5.0" />
+      </dependentAssembly>
+      <dependentAssembly>
+        <assemblyIdentity name="Syncfusion.Compression.Base" publicKeyToken="3d67ed1f87d44c89" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-100.2460.1.0" newVersion="100.2460.1.0" />
+      </dependentAssembly>
+    </assemblyBinding>
+  </runtime>
+</configuration>

Redaction/Replace-existing-text-in-a-PDF/.NET Framework/Replace-existing-text-in-a-PDF/Program.cs

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+using System.Drawing;
+using Syncfusion.Pdf;
+using Syncfusion.Pdf.Graphics;
+using Syncfusion.Pdf.Parsing;
+using Syncfusion.Pdf.Redaction;
+using System.Collections.Generic;
+using System.IO;
+
+namespace Replace_existing_text_in_a_PDF
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            // Load the PDF document
+            using (PdfLoadedDocument ldoc = new PdfLoadedDocument(Path.GetFullPath(@"Data/Input.pdf")))
+            {
+                // Dictionary to store the found text bounds for each page
+                Dictionary<int, List<RectangleF>> matchedTextbounds = new Dictionary<int, List<RectangleF>>();
+                // Get the first page of the PDF
+                PdfLoadedPage page = ldoc.Pages[0] as PdfLoadedPage;
+                // Search for the text and get its bounding rectangles
+                ldoc.FindText("Fusce", out matchedTextbounds);
+                // Loop through each page with matches
+                for (int i = 0; i < matchedTextbounds.Count; i++)
+                {
+                    // Get all rectangles where the text was found on this page
+                    List<RectangleF> rectangles = matchedTextbounds[i];
+                    // Loop through each found rectangle
+                    for (int j = 0; j < rectangles.Count; j++)
+                    {
+                        // Create a redaction area with transparent fill over the found text
+                        PdfRedaction redaction = new PdfRedaction(rectangles[j], Color.Transparent);
+                        // Draw the replacement text on the redaction area
+                        redaction.Appearance.Graphics.DrawString(
+                            "Hello",
+                            new PdfStandardFont(PdfFontFamily.Helvetica, 9),
+                            PdfBrushes.Black,
+                            PointF.Empty
+                        );
+                        // Add the redaction to the page
+                        page.AddRedaction(redaction);
+                    }
+                }
+                // Save the PDF document
+                ldoc.Save(Path.GetFullPath(@"Output/Output.pdf"));
+            }
+        }
+    }
+}

Redaction/Replace-existing-text-in-a-PDF/.NET Framework/Replace-existing-text-in-a-PDF/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Replace-existing-text-in-a-PDF")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Replace-existing-text-in-a-PDF")]
+[assembly: AssemblyCopyright("Copyright ©  2026")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("27ffc4d8-a2ca-4a30-aba0-80a4db3a1895")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

Redaction/Replace-existing-text-in-a-PDF/.NET Framework/Replace-existing-text-in-a-PDF/Replace-existing-text-in-a-PDF.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{27FFC4D8-A2CA-4A30-ABA0-80A4DB3A1895}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>Replace_existing_text_in_a_PDF</RootNamespace>
+    <AssemblyName>Replace-existing-text-in-a-PDF</AssemblyName>
+    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <Deterministic>true</Deterministic>
+    <NuGetPackageImportStamp>
+    </NuGetPackageImportStamp>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="Syncfusion.Compression.Base, Version=32.2462.5.0, Culture=neutral, PublicKeyToken=3d67ed1f87d44c89, processorArchitecture=MSIL">
+      <HintPath>..\packages\Syncfusion.Compression.Base.32.2.5\lib\net462\Syncfusion.Compression.Base.dll</HintPath>
+    </Reference>
+    <Reference Include="Syncfusion.Licensing, Version=32.2462.5.0, Culture=neutral, PublicKeyToken=632609b4d040f6b4, processorArchitecture=MSIL">
+      <HintPath>..\packages\Syncfusion.Licensing.32.2.5\lib\net462\Syncfusion.Licensing.dll</HintPath>
+    </Reference>
+    <Reference Include="Syncfusion.Pdf.Base, Version=32.2462.5.0, Culture=neutral, PublicKeyToken=3d67ed1f87d44c89, processorArchitecture=MSIL">
+      <HintPath>..\packages\Syncfusion.Pdf.WinForms.32.2.5\lib\net462\Syncfusion.Pdf.Base.dll</HintPath>
+    </Reference>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Drawing" />
+    <Reference Include="System.Numerics" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+    <None Include="packages.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

Redaction/Replace-existing-text-in-a-PDF/.NET Framework/Replace-existing-text-in-a-PDF/packages.config

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+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Syncfusion.Compression.Base" version="100.2.38" targetFramework="net48" />
+  <package id="Syncfusion.Licensing" version="32.2.5" targetFramework="net48" />
+  <package id="Syncfusion.Pdf.WinForms" version="32.2.5" targetFramework="net48" />
+</packages>