263554: Added proper code example for signature field in PDF document

Digital Signature/Add-signature-field-to-existing-PDF/.NET/Add-signature-field-to-existing-PDF.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.14.36616.10 d17.14
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Add-signature-field-to-existing-PDF", "Add-signature-field-to-existing-PDF\Add-signature-field-to-existing-PDF.csproj", "{C2328A0D-96EC-4E23-A422-097276BB435F}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{C2328A0D-96EC-4E23-A422-097276BB435F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C2328A0D-96EC-4E23-A422-097276BB435F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C2328A0D-96EC-4E23-A422-097276BB435F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C2328A0D-96EC-4E23-A422-097276BB435F}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {8BB2F11E-8503-457F-B8B6-D597ED84F394}
+	EndGlobalSection
+EndGlobal

Digital Signature/Add-signature-field-to-existing-PDF/.NET/Add-signature-field-to-existing-PDF/Add-signature-field-to-existing-PDF.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Add_signature_field_to_existing_PDF</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Syncfusion.Pdf.Net.Core" Version="*" />
+  </ItemGroup>
+
+</Project>

Digital Signature/Add-signature-field-to-existing-PDF/.NET/Add-signature-field-to-existing-PDF/Program.cs

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+using Syncfusion.Pdf;
+using Syncfusion.Pdf.Interactive;
+using Syncfusion.Pdf.Parsing;
+using Syncfusion.Drawing;
+
+// Load the existing PDF document
+using (PdfLoadedDocument loadedDocument = new PdfLoadedDocument(Path.GetFullPath(@"../../../Data/Input.pdf")))
+{
+    // Ensure the document has a form; create one if it doesn't exist
+    if (loadedDocument.Form == null)
+        loadedDocument.CreateForm();
+    // Load the first page of the PDF
+    PdfLoadedPage loadedPage = loadedDocument.Pages[0] as PdfLoadedPage;
+    // Create a new PDF signature field on the loaded page
+    PdfSignatureField signatureField = new PdfSignatureField(loadedPage, "Signature");
+    // Set properties for the signature field (position and tooltip)
+    signatureField.Bounds = new RectangleF(100, 300, 90, 20);
+    signatureField.ToolTip = "Signature";
+    // Add the signature field to the form in the existing document
+    loadedDocument.Form.Fields.Add(signatureField);
+    // Save the PDF document
+    loadedDocument.Save(Path.GetFullPath(@"../../../Output/Output.pdf"));
+}