Added the samples

Author: johnsonmonohar

Export-HTML-table-from-web-page-to-Excel/Controllers/HomeController.cs

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+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+using ImportHtmlTable.Models;
+
+namespace ImportHtmlTable.Controllers
+{
+    public class HomeController : Controller
+    {
+        public IActionResult Index()
+        {
+            return View();
+        }
+
+        public IActionResult About()
+        {
+            ViewData["Message"] = "Your application description page.";
+
+            return View();
+        }
+
+        public IActionResult Contact()
+        {
+            ViewData["Message"] = "Your contact page.";
+
+            return View();
+        }
+
+        public IActionResult Privacy()
+        {
+            return View();
+        }
+
+        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+        public IActionResult Error()
+        {
+            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
+        }
+    }
+}

Export-HTML-table-from-web-page-to-Excel/Controllers/ImportHtmlTableController.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Mvc;
+using Syncfusion.XlsIO;
+
+namespace ImportHtmlTable.Controllers
+{
+    public class ImportHtmlTableController : Controller
+    {
+        private readonly IHostingEnvironment _hostingEnvironment;
+
+        public ImportHtmlTableController(IHostingEnvironment hostingEnvironment)
+        {
+            _hostingEnvironment = hostingEnvironment;
+        }
+
+        public ActionResult ImportHtmlTable(string button, string tableHTML)
+        {
+            if (button == null)
+                return View();
+
+            MemoryStream ms = new MemoryStream();
+
+            // The instantiation process consists of two steps.
+            // Step 1 : Instantiate the spreadsheet creation engine.
+            using (ExcelEngine excelEngine = new ExcelEngine())
+            {
+
+                // Step 2 : Instantiate the excel application object.
+                IApplication application = excelEngine.Excel;
+                application.DefaultVersion = ExcelVersion.Excel2016;
+
+                // A workbook is created.
+                IWorkbook workbook = application.Workbooks.Create(1);
+
+                // The first worksheet object in the worksheets collection is accessed.
+                IWorksheet worksheet = workbook.Worksheets[0];
+
+                byte[] byteArray = Encoding.UTF8.GetBytes(tableHTML);
+
+                MemoryStream file = new MemoryStream(byteArray);
+
+                // Imports HTML table into the worksheet from first row and first column
+                worksheet.ImportHtmlTable(file, 1, 1);
+
+                worksheet.UsedRange.AutofitColumns();
+                worksheet.UsedRange.AutofitRows();
+
+                workbook.SaveAs(ms);
+                ms.Position = 0;
+            }
+
+            return File(ms, "Application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "Export-HTML-Table.xlsx");
+        }
+    }
+    
+}

Export-HTML-table-from-web-page-to-Excel/ImportHtmlTable.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.App" />
+    <PackageReference Include="Microsoft.AspNetCore.Razor.Design" Version="2.1.2" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.1.9" />
+    <PackageReference Include="Syncfusion.XlsIO.Net.Core" Version="18.2.0.54" />
+  </ItemGroup>
+
+</Project>

Export-HTML-table-from-web-page-to-Excel/ImportHtmlTable.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.28307.1022
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ImportHtmlTable", "ImportHtmlTable.csproj", "{9E7C9A6D-2EA1-4E70-A52A-206754127656}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Debug-Xml|Any CPU = Debug-Xml|Any CPU
+		Release|Any CPU = Release|Any CPU
+		Release-Xml|Any CPU = Release-Xml|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{9E7C9A6D-2EA1-4E70-A52A-206754127656}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{9E7C9A6D-2EA1-4E70-A52A-206754127656}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{9E7C9A6D-2EA1-4E70-A52A-206754127656}.Debug-Xml|Any CPU.ActiveCfg = Debug|Any CPU
+		{9E7C9A6D-2EA1-4E70-A52A-206754127656}.Debug-Xml|Any CPU.Build.0 = Debug|Any CPU
+		{9E7C9A6D-2EA1-4E70-A52A-206754127656}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{9E7C9A6D-2EA1-4E70-A52A-206754127656}.Release|Any CPU.Build.0 = Release|Any CPU
+		{9E7C9A6D-2EA1-4E70-A52A-206754127656}.Release-Xml|Any CPU.ActiveCfg = Release|Any CPU
+		{9E7C9A6D-2EA1-4E70-A52A-206754127656}.Release-Xml|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {B12E0E54-B7A0-4A08-80EC-659D04F95923}
+	EndGlobalSection
+EndGlobal

Export-HTML-table-from-web-page-to-Excel/Models/ErrorViewModel.cs

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+using System;
+
+namespace ImportHtmlTable.Models
+{
+    public class ErrorViewModel
+    {
+        public string RequestId { get; set; }
+
+        public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+    }
+}

Export-HTML-table-from-web-page-to-Excel/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging;
+
+namespace ImportHtmlTable
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            CreateWebHostBuilder(args).Build().Run();
+        }
+
+        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
+            WebHost.CreateDefaultBuilder(args)
+                .UseStartup<Startup>();
+    }
+}

Export-HTML-table-from-web-page-to-Excel/Properties/launchSettings.json

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+{
+  "iisSettings": {
+    "windowsAuthentication": false, 
+    "anonymousAuthentication": true, 
+    "iisExpress": {
+      "applicationUrl": "http://localhost:56336",
+      "sslPort": 44383
+    }
+  },
+  "profiles": {
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "ImportHtmlTable": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "applicationUrl": "https://localhost:5001;http://localhost:5000",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

Export-HTML-table-from-web-page-to-Excel/Startup.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.HttpsPolicy;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace ImportHtmlTable
+{
+    public class Startup
+    {
+        public Startup(IConfiguration configuration)
+        {
+            Configuration = configuration;
+        }
+
+        public IConfiguration Configuration { get; }
+
+        // This method gets called by the runtime. Use this method to add services to the container.
+        public void ConfigureServices(IServiceCollection services)
+        {
+            services.Configure<CookiePolicyOptions>(options =>
+            {
+                // This lambda determines whether user consent for non-essential cookies is needed for a given request.
+                options.CheckConsentNeeded = context => true;
+                options.MinimumSameSitePolicy = SameSiteMode.None;
+            });
+
+
+            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
+        }
+
+        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
+        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
+        {
+            if (env.IsDevelopment())
+            {
+                app.UseDeveloperExceptionPage();
+            }
+            else
+            {
+                app.UseExceptionHandler("/Home/Error");
+                app.UseHsts();
+            }
+
+            app.UseHttpsRedirection();
+            app.UseStaticFiles();
+            app.UseCookiePolicy();
+
+            app.UseMvc(routes =>
+            {
+                routes.MapRoute(
+                    name: "default",
+                    template: "{controller=ImportHtmlTable}/{action=ImportHtmlTable}/{id?}");
+            });
+        }
+    }
+}

Export-HTML-table-from-web-page-to-Excel/Views/Home/About.cshtml

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+@{
+    ViewData["Title"] = "About";
+}
+<h2>@ViewData["Title"]</h2>
+<h3>@ViewData["Message"]</h3>
+
+<p>Use this area to provide additional information.</p>

Export-HTML-table-from-web-page-to-Excel/Views/Home/Contact.cshtml

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+@{
+    ViewData["Title"] = "Contact";
+}
+<h2>@ViewData["Title"]</h2>
+<h3>@ViewData["Message"]</h3>
+
+<address>
+    One Microsoft Way<br />
+    Redmond, WA 98052-6399<br />
+    <abbr title="Phone">P:</abbr>
+    425.555.0100
+</address>
+
+<address>
+    <strong>Support:</strong> <a href="mailto:Support@example.com">Support@example.com</a><br />
+    <strong>Marketing:</strong> <a href="mailto:Marketing@example.com">Marketing@example.com</a>
+</address>