Add sample for edit text and alt text of image

Slides/Edit-text-and-image-alt-text/Edit-text-and-image-alt-text.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.12.35417.141 d17.12
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Edit-text-and-image-alt-text", "Edit-text-and-image-alt-text\Edit-text-and-image-alt-text.csproj", "{E1319FAA-3500-4DAE-A3C6-35FFB542911F}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{E1319FAA-3500-4DAE-A3C6-35FFB542911F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E1319FAA-3500-4DAE-A3C6-35FFB542911F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E1319FAA-3500-4DAE-A3C6-35FFB542911F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E1319FAA-3500-4DAE-A3C6-35FFB542911F}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

Slides/Edit-text-and-image-alt-text/Edit-text-and-image-alt-text/Edit-text-and-image-alt-text.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Edit_text_and_image_alt_text</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+	<ItemGroup>
+		<PackageReference Include="Syncfusion.Presentation.Net.Core" Version="*" />
+	</ItemGroup>
+
+	<ItemGroup>
+		<None Update="Data\Template.pptx">
+			<CopyToOutputDirectory>Always</CopyToOutputDirectory>
+		</None>
+		<None Update="Output\.gitkeep">
+			<CopyToOutputDirectory>Always</CopyToOutputDirectory>
+		</None>
+	</ItemGroup>
+
+</Project>

Slides/Edit-text-and-image-alt-text/Edit-text-and-image-alt-text/Program.cs

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+using Syncfusion.Presentation;
+
+//Load or open an PowerPoint Presentation.
+using FileStream inputStream = new(Path.GetFullPath(@"Data/Template.pptx"), FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
+//Open an existing PowerPoint presentation.
+using IPresentation pptxDoc = Presentation.Open(inputStream);
+//Retrieve the slide instance.
+ISlide slide = pptxDoc.Slides[0];
+//Retrieves the first shape.
+IShape shape = slide.Shapes[0] as IShape;
+//Retrieves the first paragraph of the shape.
+IParagraph paragraph = shape.TextBody.Paragraphs[0];
+//Retrieves the first TextPart of the shape.
+ITextPart textPart = paragraph.TextParts[0];
+//Modifies the text content of the TextPart.
+textPart.Text = "Hello Presentation";
+//Retrieve the first picture from the slide.
+IPicture picture = slide.Pictures[0];
+//Modifies the label of the image.
+picture.Description = "Replaced alt text";
+//Saves the modified PowerPoint Presentation.
+using FileStream outputStream = new(Path.GetFullPath(@"Output/Result.pptx"), FileMode.Create, FileAccess.ReadWrite);
+pptxDoc.Save(outputStream);