SyncfusionExamples · rparthi-1687 · Aug 1, 2025 · Aug 1, 2025
diff --git a/How to/Create User Based eSign PDF Forms/Controllers/HomeController.cs b/How to/Create User Based eSign PDF Forms/Controllers/HomeController.cs
@@ -0,0 +1,105 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Caching.Memory;
+using Syncfusion.EJ2.PdfViewer;
+using System.IO;
+using Newtonsoft.Json;
+using Syncfusion.Pdf.Parsing;
+using System.Security.Cryptography.X509Certificates;
+using Syncfusion.Pdf.Security;
+using Syncfusion.Pdf;
+using System.Net;
+#if REDIS
+using Microsoft.Extensions.Caching.Distributed;
+#endif
+
+namespace ESigningSimpleSample.Controllers
+{
+    public partial class HomeController : Controller
+    {
+        private IMemoryCache _cache;
+        private readonly IWebHostEnvironment _hostingEnvironment;
+#if REDIS
+        private IDistributedCache _distributedCache;
+        public PdfViewerController(IMemoryCache memoryCache, IDistributedCache distributedCache, IWebHostEnvironment hostingEnvironment)
+#else
+        public HomeController(IMemoryCache memoryCache, IWebHostEnvironment hostingEnvironment)
+#endif
+        {
+            _cache = memoryCache;
+#if REDIS
+            _distributedCache = distributedCache;
+#endif
+            _hostingEnvironment = hostingEnvironment;
+        }
+        // GET: Default
+        public ActionResult Index()
+        {
+            return View();
+        }
+        public ActionResult ESigningPdfForms()
+        {
+            return View();
+        }
+
+        [AcceptVerbs("Post")]
+        [HttpPost]
+        [Route("api/[controller]/FlattenDownload")]
+        public IActionResult FlattenDownload([FromBody] Dictionary<string, string> jsonObject)
+        {
+            try
+            {
+                string documentBase = "";
+
+                // Check if the request contains base64String (from custom JavaScript call)
+                if (jsonObject != null && jsonObject.ContainsKey("base64String"))
+                {
+                    documentBase = jsonObject["base64String"];
+                }
+
+                // Handle base64 string processing safely
+                string base64String = "";
+                if (documentBase.Contains("data:application/pdf;base64,"))
+                {
+                    base64String = documentBase.Split(new string[] { "data:application/pdf;base64," }, StringSplitOptions.None)[1];
+                }
+                else
+                {
+                    // Assume it's already just the base64 data without the prefix
+                    base64String = documentBase;
+                }
+
+                byte[] byteArray = Convert.FromBase64String(base64String);
+                PdfLoadedDocument loadedDocument = new PdfLoadedDocument(byteArray);
+
+                if (loadedDocument.Form != null)
+                {
+                    loadedDocument.FlattenAnnotations();
+                    loadedDocument.Form.Flatten = true;
+                }
+
+                //Save the PDF document.
+                MemoryStream stream = new MemoryStream();
+                //Save the PDF document
+                loadedDocument.Save(stream);
+                stream.Position = 0;
+                //Close the document
+                loadedDocument.Close(true);
+
+                string updatedDocumentBase = Convert.ToBase64String(stream.ToArray());
+                documentBase = "data:application/pdf;base64," + updatedDocumentBase;
+                return Content(documentBase);
+            }
+            catch (Exception ex)
+            {
+                return BadRequest($"Error processing PDF: {ex.Message}");
+            }
+        }
+
+    }
+}
diff --git a/How to/Create User Based eSign PDF Forms/ESigningSimpleSample.csproj b/How to/Create User Based eSign PDF Forms/ESigningSimpleSample.csproj
@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+	<ItemGroup>
+		<PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="8.0.0" />
+		<PackageReference Include="Microsoft.Extensions.Caching.Redis" Version="2.2.0" Condition="$(DefineConstants.Contains('REDIS'))" />
+		<PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="8.0.0" />
+		<PackageReference Include="Syncfusion.EJ2.AspNet.Core" Version="27.1.57" />
+		<PackageReference Include="Syncfusion.EJ2.PdfViewer.AspNet.Core.Windows" Version="27.1.57" />
+		<PackageReference Include="Syncfusion.SkiaSharpHelper.Net.Core" Version="27.1.57" />
+		<PackageReference Include="System.Net.Http" Version="4.3.4" />
+		<PackageReference Include="System.Text.RegularExpressions" Version="4.3.1" />
+	</ItemGroup>
+</Project>
diff --git a/How to/Create User Based eSign PDF Forms/ESigningSimpleSample.csproj.user b/How to/Create User Based eSign PDF Forms/ESigningSimpleSample.csproj.user
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <ActiveDebugProfile>IIS Express</ActiveDebugProfile>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
+    <DebuggerFlavor>ProjectDebugger</DebuggerFlavor>
+  </PropertyGroup>
+</Project>
diff --git a/How to/Create User Based eSign PDF Forms/ESigningSimpleSample.sln b/How to/Create User Based eSign PDF Forms/ESigningSimpleSample.sln
@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.10.34818.151
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ESigningSimpleSample", "ESigningSimpleSample.csproj", "{B3F357A0-E249-4330-A8BE-C50E7248CF9F}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{B3F357A0-E249-4330-A8BE-C50E7248CF9F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B3F357A0-E249-4330-A8BE-C50E7248CF9F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B3F357A0-E249-4330-A8BE-C50E7248CF9F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B3F357A0-E249-4330-A8BE-C50E7248CF9F}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {7B65EB19-C66B-4322-ABAB-679E7F0E9DE4}
+	EndGlobalSection
+EndGlobal
diff --git a/How to/Create User Based eSign PDF Forms/Models/ErrorViewModel.cs b/How to/Create User Based eSign PDF Forms/Models/ErrorViewModel.cs
@@ -0,0 +1,9 @@
+namespace ESigningSimpleSample.Models
+{
+    public class ErrorViewModel
+    {
+        public string? RequestId { get; set; }
+
+        public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+    }
+}
diff --git a/How to/Create User Based eSign PDF Forms/NuGet.config b/How to/Create User Based eSign PDF Forms/NuGet.config
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <packageSources>
+    <clear />
+    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
+  </packageSources>
+  <fallbackPackageFolders>
+    <clear />
+  </fallbackPackageFolders>
+  <disabledPackageSources>
+    <clear />
+  </disabledPackageSources>
+</configuration>
diff --git a/How to/Create User Based eSign PDF Forms/Program.cs b/How to/Create User Based eSign PDF Forms/Program.cs
@@ -0,0 +1,33 @@
+using Newtonsoft.Json.Serialization;
+
+var builder = WebApplication.CreateBuilder(args);
+
+// Add services to the container.
+builder.Services.AddControllersWithViews();
+builder.Services.AddControllers().AddNewtonsoftJson(options =>
+{
+    // Use the default property (Pascal) casing
+    options.SerializerSettings.ContractResolver = new DefaultContractResolver();
+});
+var app = builder.Build();
+
+// Configure the HTTP request pipeline.
+if (!app.Environment.IsDevelopment())
+{
+    app.UseExceptionHandler("/Home/Error");
+    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
+    app.UseHsts();
+}
+
+app.UseHttpsRedirection();
+app.UseStaticFiles();
+
+app.UseRouting();
+
+app.UseAuthorization();
+
+app.MapControllerRoute(
+    name: "default",
+    pattern: "{controller=Home}/{action=Index}/{id?}");
+
+app.Run();
diff --git a/How to/Create User Based eSign PDF Forms/Properties/launchSettings.json b/How to/Create User Based eSign PDF Forms/Properties/launchSettings.json
@@ -0,0 +1,38 @@
+{
+  "$schema": "http://json.schemastore.org/launchsettings.json",
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:59435",
+      "sslPort": 44320
+    }
+  },
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "applicationUrl": "http://localhost:5229",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "https": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "applicationUrl": "https://localhost:7252;http://localhost:5229",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}