Add net5.0-windows build on x86 apps for now.

samples/Sample.Net5Console/Program.cs

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+using NTwain;
+using NTwain.Data;
+using System;
+using System.Linq;
+using System.Reflection;
+using System.Threading;
+
+namespace Sample.Net5Console
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            if (PlatformInfo.Current.IsApp64Bit)
+            {
+                Console.WriteLine("[64bit]");
+            }
+            else
+            {
+                Console.WriteLine("[32bit]");
+            }
+            // just an amusing example to do twain in console without UI
+            ThreadPool.QueueUserWorkItem(o =>
+            {
+                try
+                {
+                    DoTwainWork();
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine("ERROR: " + ex.ToString());
+                }
+            });
+            Console.WriteLine("Test started, press Enter to exit.");
+            Console.ReadLine();
+        }
+
+
+
+        static readonly TwainSession twain = InitTwain();
+        private static TwainSession InitTwain()
+        {
+            var twain = new TwainSession(TWIdentity.CreateFromAssembly(DataGroups.Image, Assembly.GetExecutingAssembly()));
+            twain.TransferReady += (s, e) =>
+            {
+                Console.WriteLine("Got xfer ready on thread {0}.", Thread.CurrentThread.ManagedThreadId);
+            };
+            twain.DataTransferred += (s, e) =>
+            {
+                if (e.NativeData != IntPtr.Zero)
+                {
+                    Console.WriteLine("SUCCESS! Got twain data on thread {0}.", Thread.CurrentThread.ManagedThreadId);
+                }
+                else
+                {
+                    Console.WriteLine("BUMMER! No twain data on thread {0}.", Thread.CurrentThread.ManagedThreadId);
+                }
+            };
+
+            twain.SourceDisabled += (s, e) =>
+            {
+                Console.WriteLine("Source disabled on thread {0}.", Thread.CurrentThread.ManagedThreadId);
+                var rc = twain.CurrentSource.Close();
+                rc = twain.Close();
+            };
+            return twain;
+        }
+
+        const string SAMPLE_SOURCE = "TWAIN2 FreeImage Software Scanner";
+        static void DoTwainWork()
+        {
+            Console.WriteLine("Getting ready to do twain stuff on thread {0}...", Thread.CurrentThread.ManagedThreadId);
+            Thread.Sleep(1000);
+
+            var rc = twain.Open();
+
+            if (rc == ReturnCode.Success)
+            {
+                var hit = twain.FirstOrDefault(s => string.Equals(s.Name, SAMPLE_SOURCE));
+                if (hit == null)
+                {
+                    Console.WriteLine("The sample source \"" + SAMPLE_SOURCE + "\" is not installed.");
+                    twain.Close();
+                }
+                else
+                {
+                    rc = hit.Open();
+
+                    if (rc == ReturnCode.Success)
+                    {
+                        Console.WriteLine("Starting capture from the sample source...");
+                        rc = hit.Enable(SourceEnableMode.NoUI, false, IntPtr.Zero);
+                    }
+                    else
+                    {
+                        twain.Close();
+                    }
+                }
+            }
+            else
+            {
+                Console.WriteLine("Failed to open dsm with rc={0}!", rc);
+            }
+        }
+
+    }
+}

samples/Sample.Net5Console/Sample.Net5Console.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0-windows</TargetFramework>
+    <PlatformTarget>x86</PlatformTarget>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\NTwain\NTwain.csproj" />
+  </ItemGroup>
+
+</Project>