998728: Added Sample for add stamp annotation with Author, date and time

Annotations/Custom_stamp/App.xaml

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+<Application x:Class="Custom_Stamp.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:Custom_Stamp"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+
+    </Application.Resources>
+</Application>

Annotations/Custom_stamp/App.xaml.cs

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+using System.Configuration;
+using System.Data;
+using System.Windows;
+
+namespace Custom_Stamp
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+
+}

Annotations/Custom_stamp/AssemblyInfo.cs

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+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None,            //where theme specific resource dictionaries are located
+                                                //(used if a resource is not found in the page,
+                                                // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly   //where the generic resource dictionary is located
+                                                //(used if a resource is not found in the page,
+                                                // app, or any theme specific resource dictionaries)
+)]

Annotations/Custom_stamp/Custom_Stamp.slnx

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+<Solution>
+  <Project Path="Custom_Stamp.csproj" />
+</Solution>

Annotations/Custom_stamp/Custom_stamp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Syncfusion.PdfViewer.WPF" Version="*" />
+    <PackageReference Include="System.Drawing.Common" Version="10.0.1" />
+  </ItemGroup>
+  <Import Project="targets\MultiTargeting.targets" /> 
+</Project>

Annotations/Custom_stamp/MainWindow.xaml

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+<Window x:Class="Custom_Stamp.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:Custom_Stamp" xmlns:syncfusion="clr-namespace:Syncfusion.Windows.PdfViewer;assembly=Syncfusion.PdfViewer.WPF"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800">
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="*"/>
+        </Grid.RowDefinitions>
+
+        <!-- Button in the first row -->
+        <Button Grid.Row="0" Content="Button" Width="100" Height="30" Margin="10" Click="Button_Click"/>
+        <syncfusion:PdfViewerControl Grid.Row="1" x:Name="pdfViewer"></syncfusion:PdfViewerControl>
+    </Grid>
+</Window>

Annotations/Custom_stamp/MainWindow.xaml.cs

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+using Syncfusion.Windows.PdfViewer;
+using System;
+using System.Drawing;
+using System.IO;
+using System.Windows;
+using System.Windows.Media.Imaging;
+
+namespace Custom_Stamp
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+            pdfViewer.Load("../../../Data/Input.pdf");
+        }
+        private void Button_Click(object sender, RoutedEventArgs e)
+        {
+            string authorName = "John Doe";
+            string dateTimeText = DateTime.Now.ToString("dd-MMM-yyyy HH:mm");
+            string metaText = $"{authorName} | {dateTimeText}";
+
+            // Load original stamp image
+            Bitmap originalStamp = new Bitmap("../../../Data/Approved.png");
+
+            using (Graphics g = Graphics.FromImage(originalStamp))
+            {
+                g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
+                g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAliasGridFit;
+
+                using (Font font = new Font("Arial", 9))
+                {
+                    SizeF textSize = g.MeasureString(metaText, font);
+
+                    // Position text at bottom-right inside the image
+                    float x = originalStamp.Width - textSize.Width - 10; // 10px padding from right
+                    float y = originalStamp.Height - textSize.Height - 5; // 5px padding from bottom
+
+                    g.DrawString(metaText, font, System.Drawing.Brushes.Black, new PointF(x, y));
+                }
+            }
+
+            // Convert to BitmapImage for WPF PdfViewer
+            BitmapImage bitmapImage;
+            using (MemoryStream ms = new MemoryStream())
+            {
+                originalStamp.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
+                ms.Position = 0;
+
+                bitmapImage = new BitmapImage();
+                bitmapImage.BeginInit();
+                bitmapImage.StreamSource = ms;
+                bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
+                bitmapImage.EndInit();
+            }
+
+            // Create PdfStampAnnotation
+            System.Windows.Controls.Image stampImage = new System.Windows.Controls.Image() { Source = bitmapImage };
+            PdfStampAnnotation stampAnnotation = new PdfStampAnnotation(stampImage);
+
+            // Add stamp to PDF
+            System.Windows.Point position = new System.Windows.Point(125, 108);
+            System.Drawing.Size stampSize = new System.Drawing.Size(originalStamp.Width, originalStamp.Height);
+            pdfViewer.AddStamp(stampAnnotation, 1, position, stampSize);
+
+        }
+    }
+}

Annotations/Custom_stamp/targets/MultiTargeting.targets

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+<Project>
+  <PropertyGroup>
+    <TargetFrameworks>net462;net8.0-windows;net9.0-windows;net10.0-windows</TargetFrameworks>
+    <UseWPF>true</UseWPF>
+    <GenerateAssemblyInfo>False</GenerateAssemblyInfo>
+    <GenerateDocumentationFile>True</GenerateDocumentationFile>
+    <EnableDefaultItems>True</EnableDefaultItems>
+	<EnableDefaultEmbeddedResourceItems>True</EnableDefaultEmbeddedResourceItems>	
+  </PropertyGroup>
+</Project>