diff --git a/DbFirst.Application/Catalogs/CatalogReadDto.cs b/DbFirst.Application/Catalogs/CatalogReadDto.cs
index 260e0da..5030170 100644
--- a/DbFirst.Application/Catalogs/CatalogReadDto.cs
+++ b/DbFirst.Application/Catalogs/CatalogReadDto.cs
@@ -3,9 +3,9 @@ namespace DbFirst.Application.Catalogs;
 public class CatalogReadDto
 {
     public int Guid { get; set; }
-    public string CatTitle { get; set; } = String.Empty;
-    public string CatString { get; set; } = String.Empty;
-    public string AddedWho { get; set; } = String.Empty;
+    public string CatTitle { get; set; } = string.Empty;
+    public string CatString { get; set; } = string.Empty;
+    public string AddedWho { get; set; } = string.Empty;
     public DateTime AddedWhen { get; set; }
     public string? ChangedWho { get; set; }
     public DateTime? ChangedWhen { get; set; }
diff --git a/DbFirst.Application/Catalogs/CatalogWriteDto.cs b/DbFirst.Application/Catalogs/CatalogWriteDto.cs
index c95e39c..0d92af9 100644
--- a/DbFirst.Application/Catalogs/CatalogWriteDto.cs
+++ b/DbFirst.Application/Catalogs/CatalogWriteDto.cs
@@ -4,7 +4,7 @@ namespace DbFirst.Application.Catalogs;
 
 public class CatalogWriteDto
 {
-    public string CatTitle { get; set; } = null!;
-    public string CatString { get; set; } = null!;
+    public string CatTitle { get; set; } = string.Empty;
+    public string CatString { get; set; } = string.Empty;
     public CatalogUpdateProcedure UpdateProcedure { get; set; } = CatalogUpdateProcedure.Update;
 }
diff --git a/DbFirst.BlazorWebApp/Models/CatalogReadDto.cs b/DbFirst.BlazorWebApp/Models/CatalogReadDto.cs
index f930e2e..055ed95 100644
--- a/DbFirst.BlazorWebApp/Models/CatalogReadDto.cs
+++ b/DbFirst.BlazorWebApp/Models/CatalogReadDto.cs
@@ -3,9 +3,9 @@ namespace DbFirst.BlazorWebApp.Models;
 public class CatalogReadDto
 {
     public int Guid { get; set; }
-    public string CatTitle { get; set; } = null!;
-    public string CatString { get; set; } = null!;
-    public string AddedWho { get; set; } = null!;
+    public string CatTitle { get; set; } = string.Empty;
+    public string CatString { get; set; } = string.Empty;
+    public string AddedWho { get; set; } = string.Empty;
     public DateTime AddedWhen { get; set; }
     public string? ChangedWho { get; set; }
     public DateTime? ChangedWhen { get; set; }
diff --git a/DbFirst.Domain/Entities/VwmyCatalog.cs b/DbFirst.Domain/Entities/VwmyCatalog.cs
index a594711..f9603ad 100644
--- a/DbFirst.Domain/Entities/VwmyCatalog.cs
+++ b/DbFirst.Domain/Entities/VwmyCatalog.cs
@@ -4,11 +4,11 @@ public partial class VwmyCatalog
 {
     public int Guid { get; set; }
 
-    public string CatTitle { get; set; } = String.Empty;
+    public string CatTitle { get; set; } = string.Empty;
 
-    public string CatString { get; set; } = String.Empty;
+    public string CatString { get; set; } = string.Empty;
 
-    public string AddedWho { get; set; } = String.Empty;
+    public string AddedWho { get; set; } = string.Empty;
     
     public DateTime AddedWhen { get; set; }