1049624: Added the README.md for Edit Presentation sample

Read-and-save-PowerPoint-presentation/Edit-PowerPoint-presentation/.NET/Edit-PowerPoint-presentation/README.md

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+# Edit Presentation using C#
+
+The [.NET PowerPoint library](https://www.syncfusion.com/document-sdk/net-powerpoint-library) (Presentation) enables you to create, read, and edit PowerPoint files programmatically without Microsoft Office or interop dependencies. Using this library, you can modify an existing PowerPoint presentation in C# — such as updating slide content, changing layouts, editing text, images, charts, and applying new styles.
+
+## Steps to Edit an PowerPoint Presentation programmatically
+
+Step 1: Create a new .NET Core console application project.
+
+Step 2: Install the [Syncfusion.Presentation.Net.Core](https://www.nuget.org/packages/Syncfusion.Presentation.Net.Core) NuGet package as a reference to your project from [NuGet.org](https://www.nuget.org/).
+
+Step 3: Include the following namespaces in the Program.cs file.
+
+```csharp
+using Syncfusion.Presentation; 
+using System.IO; 
+```
+
+Step 4: Add the following code snippet in the Program.cs file to edit the PowerPoint presentation — update background, text, images, and table styles:
+
+```csharp
+//Opens the PPTX document. 
+using IPresentation pptxDoc = Presentation.Open(Path.GetFullPath(@"Data/Template.pptx")); 
+
+//Get the new background picture as a stream. 
+using FileStream bgPictureStream = new FileStream(Path.GetFullPath(@"Data/Background.png"), FileMode.Open); 
+//Create an instance for memory stream 
+using MemoryStream bgMemoryStream = new MemoryStream(); 
+//Copy stream to memoryStream. 
+bgPictureStream.CopyTo(bgMemoryStream); 
+
+//Set the master slide background fill as Picture fill in PPTX document. 
+pptxDoc.Masters[0].Background.Fill.FillType = FillType.Picture; 
+pptxDoc.Masters[0].Background.Fill.PictureFill.ImageBytes = bgMemoryStream.ToArray(); 
+
+//Get the first shape of the first slide from the PPTX document. 
+IShape shape = pptxDoc.Slides[0].Shapes[0] as IShape; 
+//Change the text of the shape. 
+if (shape.TextBody.Text == "Company History") 
+    shape.TextBody.Text = "Adventure Cycles History"; 
+
+//Get the new picture as a stream. 
+using FileStream pictureStream = new FileStream(Path.GetFullPath(@"Data/AdventureCycles.png"), FileMode.Open);
+//Create an instance for memory stream 
+using MemoryStream picMemoryStream = new MemoryStream(); 
+//Copy stream to memoryStream. 
+pictureStream.CopyTo(picMemoryStream); 
+
+//Replace the existing image with the new image. 
+pptxDoc.Slides[0].Pictures[0].ImageData = picMemoryStream.ToArray(); 
+
+//Changes the built in style of the table. 
+ITable table = pptxDoc.Slides[2].Tables[0]; 
+table.BuiltInStyle = BuiltInTableStyle.ThemedStyle2Accent5; 
+
+//Save the PPTX document 
+pptxDoc.Save(Path.GetFullPath(@"Output/Output.pptx")); 
+```
+
+More information about create an PowerPoint Presentation, you can be refer in this [documentation](https://help.syncfusion.com/document-processing/powerpoint/powerpoint-library/net/working-with-powerpoint-presentation) section.

Sections/Split-PowerPoint-by-Sections/.NET/Split-PowerPoint-by-sections/README.md

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+#  Split Presentation using C#
+
+The [.NET PowerPoint library](https://www.syncfusion.com/document-sdk/net-powerpoint-library) (Presentation) enables you to create, read, and edit PowerPoint files programmatically without Microsoft Office or interop dependencies. Using this library, you can **Split an PowerPoint Presentation** using C#.
+
+## Steps to Split an PowerPoint Presentation programmatically
+
+Step 1: Create a new .NET Core console application project.
+
+Step 2: Install the [Syncfusion.Presentation.Net.Core](https://www.nuget.org/packages/Syncfusion.Presentation.Net.Core) NuGet package as a reference to your project from [NuGet.org](https://www.nuget.org/).
+
+Step 3: Include the following namespaces in the Program.cs file.
+
+```csharp
+using Syncfusion.Presentation;
+using Syncfusion.Compression.Zip;
+```
+
+Step 4: Add the following code snippet in Program.cs file to Split in the PowerPoint Presentation.
+
+```csharp
+ZipArchive zipArchive = new ZipArchive();
+zipArchive.DefaultCompressionLevel = Syncfusion.Compression.CompressionLevel.Best;
+
+// Open the source PowerPoint presentation.
+IPresentation sourcePptx = Presentation.Open(Path.GetFullPath(@"Data/Template.pptx"));
+
+// Iterate through each section in the presentation.
+foreach (ISection section in sourcePptx.Sections)
+{
+    // Create a new destination presentation for the current section.
+    IPresentation destinationPptx = Presentation.Create();
+
+    // Clone all slides from the current section and add them to the new presentation.
+    foreach (ISlide slide in section.Slides)
+    {
+        destinationPptx.Slides.Add(slide.Clone(), PasteOptions.SourceFormatting, sourcePptx);
+    }
+    // Save the section presentation to a memory stream.
+    MemoryStream memoryStream = new MemoryStream();
+    destinationPptx.Save(memoryStream);
+
+    // Add the generated presentation to the ZIP archive with the section name as the file name.
+	string outputPath = Path.Combine(section.Name + "_Slides.pptx");
+    zipArchive.AddItem(outputPath, memoryStream, true, Syncfusion.Compression.FileAttributes.Normal);
+
+    // Close the destination presentation.
+    destinationPptx.Close();
+}
+
+// Save the ZIP archive containing all section presentations.
+zipArchive.Save(Path.GetFullPath(@"Output/Split-PowerPoint-by-sections.zip"));
+// Close the ZIP archive.
+zipArchive.Close();
+// Close the source presentation.
+sourcePptx.Close();
+```
+
+More information about create an PowerPoint Presentation, you can be refer in this [documentation](https://help.syncfusion.com/document-processing/powerpoint/powerpoint-library/net/working-with-powerpoint-presentation) section.