Add call to open DS in wrapper.

samples/Net5Console/Net5Console.csproj

@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0-windows</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\NTwain\NTwain.csproj" />
+  </ItemGroup>
+
+</Project>

samples/Net5Console/Program.cs

@@ -0,0 +1,38 @@
+using NTwain;
+using System;
+using System.Reflection;
+
+namespace Net5Console
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            using (var twain = new TwainSession(Assembly.GetExecutingAssembly(), null, IntPtr.Zero))
+            {
+                if (twain.Open() == TWAINWorkingGroup.STS.SUCCESS)
+                {
+                    Console.WriteLine("Opened DSM");
+                    Console.WriteLine("Default device:");
+                    Console.WriteLine($"\t{twain.DefaultDevice}");
+                    Console.WriteLine("All devices:");
+                    foreach (var dev in twain.GetDevices())
+                    {
+                        Console.WriteLine($"\t{dev}");
+                    }
+                    Console.WriteLine("Current device:");
+                    Console.WriteLine($"\t{twain.CurrentDevice}");
+                    twain.CurrentDevice = twain.DefaultDevice;
+                    Console.WriteLine("Current device after setting:");
+                    Console.WriteLine($"\t{twain.CurrentDevice}");
+                }
+                else
+                {
+                    Console.Error.WriteLine("Failed to open DSM");
+                }
+                Console.WriteLine("Test Ended");
+            }
+        
+        }
+    }
+}