feat: Update the Read me and version bump for Major Release

CHANGELOG.md

@@ -1,3 +1,40 @@
+### Version: 3.0.0
+#### Date: Jul-13-2026
+
+##### Breaking Changes:
+- Removed `Newtonsoft.Json` dependency; all JSON serialisation now uses `System.Text.Json` (BCL)
+- `Entry.ToJson()`, `Query.Count()`, `AssetLibrary.Count()` now return `JsonObject` instead of `JObject`
+- `AssetLibrary.Query(JsonObject)` — parameter type changed from `JObject` to `JsonObject`
+- `ContentType.Fetch()`, `GlobalField.Fetch()`, `GlobalFieldQuery.Find()` now return `JsonObject` instead of `JObject`
+- `SerializerSettings` → `SerializerOptions`
+- Model classes use `[JsonPropertyName]` instead of `[JsonProperty]`
+- Requires **.NET 10** or later
+- Updated `contentstack.utils` dependency to `2.0.0` (final, non-beta)
+
+##### Feat:
+- Added `Endpoint` class for dynamic region-to-URL resolution via CDN-backed `regions.json`
+- Added `ContentstackRegionMap` to map `ContentstackRegion` enum to registry region IDs
+- Added `GCP_EU` region support
+- Added `ApiErrorBodyParser` for consistent API error envelope parsing
+- Added `JsonNodeConversion` and `JsonObjectMerge` utilities to replace Newtonsoft equivalents
+- Added `ContentstackJsonDefaults` — shared `JsonSerializerOptions` used across all custom converters
+
+##### Enh:
+- `Config.BaseUrl` now resolves hosts from the regions registry; removed hardcoded `regionCode()` and `HostURL`
+- Replaced `Console.WriteLine` with `Debug.WriteLine` in `ContentstackConvert` to suppress parse warnings from application stdout
+
+##### Chore:
+- Replaced `refresh-region.cs` with `refresh-region.py` — avoids MSBuild compiling the script as source
+- Added `build/contentstack.csharp.targets` to auto-deliver `refresh-region.py` to consumer projects on first build
+- Added `Assets/regions.json` to `.gitignore`
+- Added `EndpointTest.cs`
+- Updated .NET version in SCA scan CI from `7.0.x` to `10.0.x`
+
+##### Migration Guide:
+- See [Migrating from Newtonsoft.Json to System.Text.Json](https://www.contentstack.com/docs/developers/sdks/content-delivery-sdk/dot-net/migrate-dotnet-delivery-sdk-from-newtonsoft.json-to-system.text.json) for the full upgrade path from v2.x.
+
+---
+
 ### Version: 3.0.0-beta.2
 #### Date: Jun-22-2026
 

Contentstack.Core/Contentstack.Core.csproj

@@ -32,7 +32,7 @@
     <PackageReference Include="System.Text.Json" Version="8.0.5" />
     <PackageReference Include="Microsoft.Extensions.Options" Version="8.0.2" />
     <PackageReference Include="Markdig" Version="0.36.2" />
-    <PackageReference Include="contentstack.utils" Version="2.0.0-beta.2" />
+    <PackageReference Include="contentstack.utils" Version="2.0.0" />
     <PackageReference Include="System.Net.Http" Version="4.3.4" Condition="'$(TargetFramework)' == 'net47' Or '$(TargetFramework)' == 'net472'" />
   </ItemGroup>
   <ItemGroup>

Contentstack.Core/ContentstackClient.cs

@@ -13,6 +13,7 @@
 using System.Text.Json;
 using System.Text.Json.Nodes;
 using System.Text.Json.Serialization;
+using Contentstack.Utils.Converters;
 
 namespace Contentstack.Core
 {
@@ -150,7 +151,7 @@ public ContentstackClient(IOptions<ContentstackOptions> options)
             }
 
             // Handles deserialization of embedded entries and assets in _embedded_items responses.
-            SerializerSettings.Converters.Add(new EmbeddedObjectConverter());
+            SerializerOptions.Converters.Add(new EmbeddedObjectConverter());
         }
 
         public ContentstackClient(ContentstackOptions options) :

Directory.Build.props

@@ -1,5 +1,5 @@
 <Project>
   <PropertyGroup>
-    <Version>3.0.0-beta.2</Version>
+    <Version>3.0.0</Version>
   </PropertyGroup>
 </Project>

README.md

@@ -7,6 +7,13 @@
 
 This guide will help you get started with our .NET SDK to build apps powered by Contentstack.
 
+## Prerequisites
+To get started with .NET, you will need the following:
+
+-   .NET 10 or later
+
+> **Migrating from v2.x?** Version 3.0.0 replaces Newtonsoft.Json with System.Text.Json and changes several public API return/parameter types (e.g. `Entry.ToJson()`, `Query.Count()` now return `JsonObject` instead of `JObject`). See the [migration guide](https://www.contentstack.com/docs/developers/sdks/content-delivery-sdk/dot-net/migrate-dotnet-delivery-sdk-from-newtonsoft-to-stj) before upgrading.
+
 ## SDK Installation and Setup
 
 To use the .NET SDK, download it from here
@@ -99,6 +106,31 @@ query.Find<Product>().ContinueWith((t) => {
     } 
 });
 ```
+## Endpoint Resolution
+
+Use the `Endpoint` class to resolve Contentstack service URLs for any supported region without hardcoding hosts. This is useful when configuring `ContentstackOptions` for a specific region, including the newly added `gcp-eu` region.
+
+``` cs
+using Contentstack.Core.Endpoints; // Endpoint
+
+// Resolve the Content Delivery endpoint for a region
+string url = Endpoint.GetContentstackEndpoint("us", "contentDelivery");
+// → "https://cdn.contentstack.io"
+
+// GCP-EU region support
+string gcpEuUrl = Endpoint.GetContentstackEndpoint("gcp-eu", "contentDelivery");
+
+// Strip the https:// scheme — useful when passing the host directly to SDK configuration
+var options = new ContentstackOptions()
+{
+    ApiKey = "<api_key>",
+    DeliveryToken = "<delivery_token>",
+    Environment = "<environment>",
+    Host = Endpoint.GetContentstackEndpoint("eu", "contentDelivery", omitHttps: true)
+};
+ContentstackClient stack = new ContentstackClient(options);
+```
+
 ## API Reference
 Go through our .NET SDK API Reference guide to know about the methods that can be used to query your content in Contentstack.