diff --git a/.gitignore b/.gitignore
index 979e19bba..c30732af1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -50,4 +50,6 @@ node_modules/
 #github
 .github/
 
-App_Data/
\ No newline at end of file
+#volatile
+App_Data/
+*.db
\ No newline at end of file
diff --git a/src/samples/Elsa.Samples.CustomActivities/EchoQueryStringWorkflow.cs b/src/samples/Elsa.Samples.CustomActivities/EchoQueryStringWorkflow.cs
index 60d740beb..810175c17 100644
--- a/src/samples/Elsa.Samples.CustomActivities/EchoQueryStringWorkflow.cs
+++ b/src/samples/Elsa.Samples.CustomActivities/EchoQueryStringWorkflow.cs
@@ -12,17 +12,15 @@ namespace Elsa.Samples.CustomActivities
         public void Build(IWorkflowBuilder builder)
         {
             builder
-                .ReceiveHttpRequest("/hello")
+                .ReceiveHttpRequest("/test")
                 .Then<ReadQueryString>()
                 .WriteHttpResponse(_ => HttpStatusCode.OK, GenerateSomeHtml, _ => "text/html");
         }
 
         private string GenerateSomeHtml(ActivityExecutionContext context)
         {
-            var query = (IQueryCollection)context
-                .Input; // the output of the previous activity will be available as input to this one.
-            
-            var items = query.Select(x => $"<li>{x.Key}: {x.Value}</li>");
+            var query = (IQueryCollection)context.Input; // the output of the ReadQueryString activity will be available as input to this one.
+            var items = query!.Select(x => $"<li>{x.Key}: {x.Value}</li>");
 
             return $"<ul>{string.Join("\n", items)}</ul>";
         }
diff --git a/src/samples/Elsa.Samples.CustomActivities/ReadQueryString.cs b/src/samples/Elsa.Samples.CustomActivities/ReadQueryString.cs
index f984a53a3..4e967ef8f 100644
--- a/src/samples/Elsa.Samples.CustomActivities/ReadQueryString.cs
+++ b/src/samples/Elsa.Samples.CustomActivities/ReadQueryString.cs
@@ -6,7 +6,7 @@ using Microsoft.AspNetCore.Http;
 namespace Elsa.Samples.CustomActivities
 {
     /// <summary>
-    /// A basic activity that simply reads the query string and returns them as an output value for consumption by other activities.
+    /// A basic activity that reads and returns the query string as an output value.
     /// </summary>
     public class ReadQueryString : Activity
     {
diff --git a/src/samples/Elsa.Samples.CustomActivities/Startup.cs b/src/samples/Elsa.Samples.CustomActivities/Startup.cs
index 66432cddb..8c77d091c 100644
--- a/src/samples/Elsa.Samples.CustomActivities/Startup.cs
+++ b/src/samples/Elsa.Samples.CustomActivities/Startup.cs
@@ -1,5 +1,6 @@
 using Microsoft.AspNetCore.Builder;
 using Microsoft.Extensions.DependencyInjection;
+using YesSql.Provider.Sqlite;
 
 namespace Elsa.Samples.CustomActivities
 {
@@ -8,7 +9,7 @@ namespace Elsa.Samples.CustomActivities
         public void ConfigureServices(IServiceCollection services)
         {
             services
-                .AddElsa()
+                .AddElsa(option => option.UsePersistence(db => db.UseSqLite("Data Source=elsa.db;Cache=Shared")))
                 .AddHttpActivities()
                 .AddActivity<ReadQueryString>()
                 .AddWorkflow<EchoQueryStringWorkflow>();
diff --git a/src/samples/Elsa.Samples.CustomActivities/hello.http b/src/samples/Elsa.Samples.CustomActivities/hello.http
index 3369a5b04..c6b0578e2 100644
--- a/src/samples/Elsa.Samples.CustomActivities/hello.http
+++ b/src/samples/Elsa.Samples.CustomActivities/hello.http
@@ -1 +1 @@
-GET http://localhost:5000/hello?foo=bar&bar=baz
\ No newline at end of file
+GET http://localhost:5000/test?foo=bar&bar=baz
\ No newline at end of file
diff --git a/src/samples/Elsa.Samples.HelloWorldHttp/elsa.db b/src/samples/Elsa.Samples.HelloWorldHttp/elsa.db
deleted file mode 100644
index 60984edfc..000000000
Binary files a/src/samples/Elsa.Samples.HelloWorldHttp/elsa.db and /dev/null differ
diff --git a/src/samples/Elsa.Samples.Serialization/Program.cs b/src/samples/Elsa.Samples.Serialization/Program.cs
index 0b494b150..101e01ea0 100644
--- a/src/samples/Elsa.Samples.Serialization/Program.cs
+++ b/src/samples/Elsa.Samples.Serialization/Program.cs
@@ -19,27 +19,7 @@ namespace Elsa.Samples.Serialization
                 .AddConsoleActivities()
                 .BuildServiceProvider();
             
-            // Build a new workflow.
-            var workflow = services.GetService<IWorkflowBuilder>()
-                //.Then<WriteLine>(writeLine => writeLine.)
-                .WriteLine("Hello World!")
-                .Build();
-
-            // Get a reference to the workflow serializer. 
-            var serializer = services.GetRequiredService<IWorkflowSerializer>();
             
-            // Serialize the workflow.
-            var json = serializer.Serialize(workflow, SerializationFormats.Json);
-            Console.WriteLine(json);
-            
-            // Deserialize the workflow.
-            var deserializedWorkflow = serializer.Deserialize<WorkflowBlueprint>(json, SerializationFormats.Json);
-            
-            // Get the workflow host.
-            var workflowHost = services.GetService<IWorkflowHost>();
-            
-            // Execute the workflow.
-            await workflowHost.RunWorkflowAsync(deserializedWorkflow);
             
         }
     }