828251 Added sample project and Readme file in attachment blog.

AddAttachmentPDF/AddAttachmentPDF.sln

@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.33516.290
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AddAttachmentPDF", "AddAttachmentPDF\AddAttachmentPDF.csproj", "{B11BEB39-0721-4E8E-B093-1451A0353C7D}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{B11BEB39-0721-4E8E-B093-1451A0353C7D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B11BEB39-0721-4E8E-B093-1451A0353C7D}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B11BEB39-0721-4E8E-B093-1451A0353C7D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B11BEB39-0721-4E8E-B093-1451A0353C7D}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {FFB6BC3F-9061-4C56-AF62-94F281D0A865}
+	EndGlobalSection
+EndGlobal

AddAttachmentPDF/AddAttachmentPDF/AddAttachmentPDF.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Syncfusion.Pdf.Net.Core" Version="21.1.41" />
+  </ItemGroup>
+
+</Project>

AddAttachmentPDF/AddAttachmentPDF/Input.txt

@@ -0,0 +1 @@
+Hello world

AddAttachmentPDF/AddAttachmentPDF/Program.cs

@@ -0,0 +1,25 @@
+using Syncfusion.Pdf.Interactive;
+using Syncfusion.Pdf.Parsing;
+
+//Load the PDF document
+FileStream docStream = new FileStream("../../../Input.pdf", FileMode.Open, FileAccess.Read);
+PdfLoadedDocument loadedDocument = new PdfLoadedDocument(docStream);
+
+//Creates an attachment
+Stream fileStream = new FileStream("../../../Input.txt", FileMode.Open, FileAccess.Read);
+PdfAttachment attachment = new PdfAttachment("Input.txt", fileStream);
+attachment.ModificationDate = DateTime.Now;
+attachment.Description = "Input.txt";
+attachment.MimeType = "application/txt";
+
+if (loadedDocument.Attachments == null)
+    loadedDocument.CreateAttachment();
+//Add the attachment to the document
+loadedDocument.Attachments.Add(attachment);
+
+//Save the document into stream
+MemoryStream stream = new MemoryStream();
+loadedDocument.Save(stream);
+File.WriteAllBytes("../../../Output.pdf",stream.ToArray());
+loadedDocument.Close(true);
+stream.Close();

ExtractAttachmentPDF/ExtractAttachmentPDF.sln

@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.33516.290
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ExtractAttachmentPDF", "ExtractAttachmentPDF\ExtractAttachmentPDF.csproj", "{BE07073D-3FDC-481E-8F53-E1EDCF5C08B3}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{BE07073D-3FDC-481E-8F53-E1EDCF5C08B3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BE07073D-3FDC-481E-8F53-E1EDCF5C08B3}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BE07073D-3FDC-481E-8F53-E1EDCF5C08B3}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{BE07073D-3FDC-481E-8F53-E1EDCF5C08B3}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {CD1A86FC-9315-4940-83CE-F5D00C67FB57}
+	EndGlobalSection
+EndGlobal

ExtractAttachmentPDF/ExtractAttachmentPDF/ExtractAttachmentPDF.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Syncfusion.Pdf.Net.Core" Version="21.2.3" />
+  </ItemGroup>
+
+</Project>

ExtractAttachmentPDF/ExtractAttachmentPDF/Program.cs

@@ -0,0 +1,22 @@
+//Load the PDF document
+using Syncfusion.Pdf;
+using Syncfusion.Pdf.Interactive;
+using Syncfusion.Pdf.Parsing;
+using System.IO;
+
+//Load the PDF document
+FileStream docStream = new FileStream("../../../Input.pdf", FileMode.Open, FileAccess.Read);
+//Load an existing PDF document 
+PdfLoadedDocument loadedDocument = new PdfLoadedDocument(docStream);
+
+//Iterates the attachments 
+foreach (PdfAttachment attachment in loadedDocument.Attachments)
+{
+    //Extracts the attachment and saves it to the disk 
+    FileStream s = new FileStream(attachment.FileName, FileMode.Create);
+    s.Write(attachment.Data, 0, attachment.Data.Length);
+    s.Dispose();
+}
+
+//Close the PDF document. 
+loadedDocument.Close(true);

README.md

@@ -1,2 +1,128 @@
-# create-pdf-attachments-csharp
-This repository contains examples to create attachments in PDF using C#
+# Add and Remove Attachments in PDF using C#
+
+The [Syncfusion .NET PDF Library](https://www.syncfusion.com/document-processing/pdf-framework/net/pdf-library) provides support for file attachments in PDF documents, allowing developers to add attachments to a PDF document from within their application code. The library also provides APIs for extracting attachments from PDF documents, as well as for modifying and deleting existing attachments.
+
+This article will cover the process to add, extract and remove file attachments from a PDF document using the Syncfusion .NET PDF library. The topics related to this will be discussed in the following sections of this post:
+
+Name | Description
+--- | ---
+[Add an attachment](https://github.com/SyncfusionExamples/create-pdf-attachments-csharp/tree/master/AddAttachmentPDF) | It refers to the process of embedding a separate file, such as a text document, image, or audio file, into a PDF document.
+[Extracte and save an attachment](https://github.com/SyncfusionExamples/create-pdf-attachments-csharp/tree/master/ExtractAttachmentPDF) | It refers to the process of removing or separating a file or document that is embedded or attached within a PDF document and saving it as a separate file on your computer or device.
+[Remove an attachment](https://github.com/SyncfusionExamples/create-pdf-attachments-csharp/tree/master/RemoveAttachmentPDF) | It useful in cases where the attachment is no longer needed, or when the PDF file needs to be shared without the attached file.
+
+## Add an attachment in a PDF using C#
+
+Adding a file attachment in a PDF document refers to the process of embedding a separate file, such as a text document, image, or audio file, into a PDF document.
+
+The following code example shows how to add an attachment to a PDF file using C#.
+
+```csharp
+//Load the PDF document
+FileStream docStream = new FileStream("Input.pdf", FileMode.Open, FileAccess.Read);
+PdfLoadedDocument loadedDocument = new PdfLoadedDocument(docStream);
+
+//Creates an attachment
+Stream fileStream = new FileStream("Input.txt", FileMode.Open, FileAccess.Read);
+PdfAttachment attachment = new PdfAttachment("Input.txt", fileStream);
+attachment.ModificationDate = DateTime.Now;
+attachment.Description = "Input.txt";
+attachment.MimeType = "application/txt";
+
+if (loadedDocument.Attachments == null)
+    loadedDocument.CreateAttachment();
+//Add the attachment to the document
+loadedDocument.Attachments.Add(attachment);
+
+//Save the document into stream
+using(MemoryStream stream = new MemoryStream())
+{
+loadedDocument.Save(stream);
+}
+//Close the document.
+loadedDocument.Close(true);
+```
+By executing this code example, you will get a PDF document like the following screenshot.
+
+<img src="Screenshot/Image1.png" alt="Add attachment output" width="100%" Height="Auto"/>
+
+## Extracting and saving an attachment to the disk
+
+Extracting and saving attachment in PDF refers to the process of removing or separating a file or document that is embedded or attached within a PDF document and saving it as a separate file on your computer or device.
+
+The following code example shows how to extract attachments from an existing PDF document using C#.
+
+```csharp
+FileStream docStream = new FileStream("Input.pdf", FileMode.Open, FileAccess.Read);
+PdfLoadedDocument loadedDocument = new PdfLoadedDocument(docStream);
+
+//Iterates the attachments
+foreach (PdfAttachment attachment in loadedDocument.Attachments)
+{
+    //Extracts the attachment and saves it to the disk
+    FileStream s = new FileStream(attachment.FileName, FileMode.Create);
+    s.Write(attachment.Data, 0, attachment.Data.Length);
+    s.Dispose();
+}
+//Close the document.
+loadedDocument.Close(true);
+
+```
+
+By executing this code example, you will get an extracted text file like the following screenshot.
+
+
+<img src="Screenshot/Image2.png" alt="Extract attachment output" width="100%" Height="Auto"/>
+
+## Removing attachment from an existing PDF
+Removing a file attachment from a PDF can be useful in cases where the attachment is no longer needed, or when the PDF file needs to be shared without the attached file.
+
+The following code example shows how to remove an attachment from an existing PDF document using C#.
+
+```csharp
+/Load the PDF document 
+PdfLoadedDocument loadedDocument = new PdfLoadedDocument(docStream); 
+
+//Removes an attachment 
+PdfAttachmentCollection attachments = loadedDocument.Attachments; 
+attachments.RemoveAt(0); 
+attachments.Remove(attachments[0]); 
+attachments.Clear(); 
+
+FileStream stream = new FileStream("output.pdf", FileMode.Create); 
+//Save the modified document to file. 
+loadedDocument.Save(stream); 
+//Close the PDF document. 
+loadedDocument.Close(true); 
+stream.Close(); 
+```
+
+By executing this code example, you will get a PDF document like the following screenshot.
+
+<img src="Screenshot/Image3.png" alt="Remove attachment output" width="100%" Height="Auto"/>
+
+# How to run the examples
+* Download this project to a location in your disk. 
+* Open the solution file using Visual Studio. 
+* Rebuild the solution to install the required NuGet package. 
+* Run the application.
+
+# Resources
+*   **Product page:** [Syncfusion PDF Framework](https://www.syncfusion.com/document-processing/pdf-framework/net)
+*   **Documentation page:** [Syncfusion .NET PDF library](https://help.syncfusion.com/file-formats/pdf/overview)
+*   **Online demo:** [Syncfusion .NET PDF library - Online demos](https://ej2.syncfusion.com/aspnetcore/PDF/CompressExistingPDF#/bootstrap5)
+*   **Blog:** [Syncfusion .NET PDF library - Blog](https://www.syncfusion.com/blogs/category/pdf)
+*   **Knowledge Base:** [Syncfusion .NET PDF library - Knowledge Base](https://www.syncfusion.com/kb/windowsforms/pdf)
+*   **EBooks:** [Syncfusion .NET PDF library - EBooks](https://www.syncfusion.com/succinctly-free-ebooks)
+*   **FAQ:** [Syncfusion .NET PDF library - FAQ](https://www.syncfusion.com/faq/)
+
+# Support and feedback
+*   For any other queries, reach our [Syncfusion support team](https://www.syncfusion.com/support/directtrac/incidents/newincident?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples) or post the queries through the [community forums](https://www.syncfusion.com/forums?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples).
+*   Request new feature through [Syncfusion feedback portal](https://www.syncfusion.com/feedback?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples).
+
+# License
+This is a commercial product and requires a paid license for possession or use. Syncfusion’s licensed software, including this component, is subject to the terms and conditions of [Syncfusion's EULA](https://www.syncfusion.com/eula/es/?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples). You can purchase a licnense [here](https://www.syncfusion.com/sales/products?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples) or start a free 30-day trial [here](https://www.syncfusion.com/account/manage-trials/start-trials?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples).
+
+# About Syncfusion
+Founded in 2001 and headquartered in Research Triangle Park, N.C., Syncfusion has more than 26,000+ customers and more than 1 million users, including large financial institutions, Fortune 500 companies, and global IT consultancies.
+
+Today, we provide 1600+ components and frameworks for web ([Blazor](https://www.syncfusion.com/blazor-components?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [ASP.NET Core](https://www.syncfusion.com/aspnet-core-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [ASP.NET MVC](https://www.syncfusion.com/aspnet-mvc-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [ASP.NET WebForms](https://www.syncfusion.com/jquery/aspnet-webforms-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [JavaScript](https://www.syncfusion.com/javascript-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [Angular](https://www.syncfusion.com/angular-ui-components?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [React](https://www.syncfusion.com/react-ui-components?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [Vue](https://www.syncfusion.com/vue-ui-components?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), and [Flutter](https://www.syncfusion.com/flutter-widgets?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples)), mobile ([Xamarin](https://www.syncfusion.com/xamarin-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [Flutter](https://www.syncfusion.com/flutter-widgets?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [UWP](https://www.syncfusion.com/uwp-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), and [JavaScript](https://www.syncfusion.com/javascript-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples)), and desktop development ([WinForms](https://www.syncfusion.com/winforms-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [WPF](https://www.syncfusion.com/wpf-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [WinUI(Preview)](https://www.syncfusion.com/winui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [Flutter](https://www.syncfusion.com/flutter-widgets?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples) and [UWP](https://www.syncfusion.com/uwp-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples)). We provide ready-to-deploy enterprise software for dashboards, reports, data integration, and big data processing. Many customers have saved millions in licensing fees by deploying our software.

RemoveAttachmentPDF/RemoveAttachmentPDF.sln

@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.33516.290
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RemoveAttachmentPDF", "RemoveAttachmentPDF\RemoveAttachmentPDF.csproj", "{ED6E7997-4A76-4751-8393-4D8FB41A3995}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{ED6E7997-4A76-4751-8393-4D8FB41A3995}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{ED6E7997-4A76-4751-8393-4D8FB41A3995}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{ED6E7997-4A76-4751-8393-4D8FB41A3995}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{ED6E7997-4A76-4751-8393-4D8FB41A3995}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {6F5D2CF2-2B59-460F-AB52-196682139A77}
+	EndGlobalSection
+EndGlobal

RemoveAttachmentPDF/RemoveAttachmentPDF/Program.cs

@@ -0,0 +1,18 @@
+using Syncfusion.Pdf.Interactive;
+using Syncfusion.Pdf.Parsing;
+
+//Load the PDF document
+FileStream docStream = new FileStream("../../../Input.pdf", FileMode.Open, FileAccess.Read);
+PdfLoadedDocument loadedDocument = new PdfLoadedDocument(docStream);
+
+PdfAttachmentCollection attachments = loadedDocument.Attachments;
+attachments.RemoveAt(0);
+attachments.Remove(attachments[0]);
+attachments.Clear();
+
+//Save the document into stream
+MemoryStream stream = new MemoryStream();
+loadedDocument.Save(stream);
+File.WriteAllBytes("../../../Output.pdf", stream.ToArray());
+loadedDocument.Close();
+stream.Close();

RemoveAttachmentPDF/RemoveAttachmentPDF/RemoveAttachmentPDF.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Syncfusion.Pdf.Net.Core" Version="21.2.3" />
+  </ItemGroup>
+
+</Project>