diff --git a/dotnet-testing/AspNetCoreTestingSeries/IntegrationTestingMvc/EmployeesApp/Models/EmployeeContext.cs b/dotnet-testing/AspNetCoreTestingSeries/IntegrationTestingMvc/EmployeesApp/Models/EmployeeContext.cs
index e9fdeefc6..8b759c2ba 100644
--- a/dotnet-testing/AspNetCoreTestingSeries/IntegrationTestingMvc/EmployeesApp/Models/EmployeeContext.cs
+++ b/dotnet-testing/AspNetCoreTestingSeries/IntegrationTestingMvc/EmployeesApp/Models/EmployeeContext.cs
@@ -20,14 +20,14 @@ protected override void OnModelCreating(ModelBuilder modelBuilder)
                 (
                  new Employee
                  {
-                     Id = Guid.NewGuid(),
+                     Id = new Guid("07e57250-5443-4bdc-be13-59239ada918e"),
                      Name = "Mark",
                      AccountNumber = "123-3452134543-32",
                      Age = 30
                  },
                  new Employee
                  {
-                     Id = Guid.NewGuid(),
+                     Id = new Guid("195430d1-9227-451e-8378-65df427be580"),
                      Name = "Evelin",
                      AccountNumber = "123-9384613085-55",
                      Age = 28
diff --git a/dotnet-testing/AspNetCoreTestingSeries/StartingProject/EmployeesApp/Models/EmployeeContext.cs b/dotnet-testing/AspNetCoreTestingSeries/StartingProject/EmployeesApp/Models/EmployeeContext.cs
index e9fdeefc6..8b759c2ba 100644
--- a/dotnet-testing/AspNetCoreTestingSeries/StartingProject/EmployeesApp/Models/EmployeeContext.cs
+++ b/dotnet-testing/AspNetCoreTestingSeries/StartingProject/EmployeesApp/Models/EmployeeContext.cs
@@ -20,14 +20,14 @@ protected override void OnModelCreating(ModelBuilder modelBuilder)
                 (
                  new Employee
                  {
-                     Id = Guid.NewGuid(),
+                     Id = new Guid("07e57250-5443-4bdc-be13-59239ada918e"),
                      Name = "Mark",
                      AccountNumber = "123-3452134543-32",
                      Age = 30
                  },
                  new Employee
                  {
-                     Id = Guid.NewGuid(),
+                     Id = new Guid("195430d1-9227-451e-8378-65df427be580"),
                      Name = "Evelin",
                      AccountNumber = "123-9384613085-55",
                      Age = 28
diff --git a/dotnet-testing/AspNetCoreTestingSeries/TestingAntiForgeryToken/EmployeesApp/Models/EmployeeContext.cs b/dotnet-testing/AspNetCoreTestingSeries/TestingAntiForgeryToken/EmployeesApp/Models/EmployeeContext.cs
index e9fdeefc6..8b759c2ba 100644
--- a/dotnet-testing/AspNetCoreTestingSeries/TestingAntiForgeryToken/EmployeesApp/Models/EmployeeContext.cs
+++ b/dotnet-testing/AspNetCoreTestingSeries/TestingAntiForgeryToken/EmployeesApp/Models/EmployeeContext.cs
@@ -20,14 +20,14 @@ protected override void OnModelCreating(ModelBuilder modelBuilder)
                 (
                  new Employee
                  {
-                     Id = Guid.NewGuid(),
+                     Id = new Guid("07e57250-5443-4bdc-be13-59239ada918e"),
                      Name = "Mark",
                      AccountNumber = "123-3452134543-32",
                      Age = 30
                  },
                  new Employee
                  {
-                     Id = Guid.NewGuid(),
+                     Id = new Guid("195430d1-9227-451e-8378-65df427be580"),
                      Name = "Evelin",
                      AccountNumber = "123-9384613085-55",
                      Age = 28
diff --git a/dotnet-testing/AspNetCoreTestingSeries/TestingMvcControllers/EmployeesApp/Models/EmployeeContext.cs b/dotnet-testing/AspNetCoreTestingSeries/TestingMvcControllers/EmployeesApp/Models/EmployeeContext.cs
index e9fdeefc6..8b759c2ba 100644
--- a/dotnet-testing/AspNetCoreTestingSeries/TestingMvcControllers/EmployeesApp/Models/EmployeeContext.cs
+++ b/dotnet-testing/AspNetCoreTestingSeries/TestingMvcControllers/EmployeesApp/Models/EmployeeContext.cs
@@ -20,14 +20,14 @@ protected override void OnModelCreating(ModelBuilder modelBuilder)
                 (
                  new Employee
                  {
-                     Id = Guid.NewGuid(),
+                     Id = new Guid("07e57250-5443-4bdc-be13-59239ada918e"),
                      Name = "Mark",
                      AccountNumber = "123-3452134543-32",
                      Age = 30
                  },
                  new Employee
                  {
-                     Id = Guid.NewGuid(),
+                     Id = new Guid("195430d1-9227-451e-8378-65df427be580"),
                      Name = "Evelin",
                      AccountNumber = "123-9384613085-55",
                      Age = 28
diff --git a/dotnet-testing/AspNetCoreTestingSeries/UiTestingSelenium/EmployeesApp/Models/EmployeeContext.cs b/dotnet-testing/AspNetCoreTestingSeries/UiTestingSelenium/EmployeesApp/Models/EmployeeContext.cs
index e9fdeefc6..8b759c2ba 100644
--- a/dotnet-testing/AspNetCoreTestingSeries/UiTestingSelenium/EmployeesApp/Models/EmployeeContext.cs
+++ b/dotnet-testing/AspNetCoreTestingSeries/UiTestingSelenium/EmployeesApp/Models/EmployeeContext.cs
@@ -20,14 +20,14 @@ protected override void OnModelCreating(ModelBuilder modelBuilder)
                 (
                  new Employee
                  {
-                     Id = Guid.NewGuid(),
+                     Id = new Guid("07e57250-5443-4bdc-be13-59239ada918e"),
                      Name = "Mark",
                      AccountNumber = "123-3452134543-32",
                      Age = 30
                  },
                  new Employee
                  {
-                     Id = Guid.NewGuid(),
+                     Id = new Guid("195430d1-9227-451e-8378-65df427be580"),
                      Name = "Evelin",
                      AccountNumber = "123-9384613085-55",
                      Age = 28
diff --git a/dotnet-testing/AspNetCoreTestingSeries/UnitTestingWithXUnit/EmployeesApp/Models/EmployeeContext.cs b/dotnet-testing/AspNetCoreTestingSeries/UnitTestingWithXUnit/EmployeesApp/Models/EmployeeContext.cs
index e9fdeefc6..8b759c2ba 100644
--- a/dotnet-testing/AspNetCoreTestingSeries/UnitTestingWithXUnit/EmployeesApp/Models/EmployeeContext.cs
+++ b/dotnet-testing/AspNetCoreTestingSeries/UnitTestingWithXUnit/EmployeesApp/Models/EmployeeContext.cs
@@ -20,14 +20,14 @@ protected override void OnModelCreating(ModelBuilder modelBuilder)
                 (
                  new Employee
                  {
-                     Id = Guid.NewGuid(),
+                     Id = new Guid("07e57250-5443-4bdc-be13-59239ada918e"),
                      Name = "Mark",
                      AccountNumber = "123-3452134543-32",
                      Age = 30
                  },
                  new Employee
                  {
-                     Id = Guid.NewGuid(),
+                     Id = new Guid("195430d1-9227-451e-8378-65df427be580"),
                      Name = "Evelin",
                      AccountNumber = "123-9384613085-55",
                      Age = 28