diff --git a/README.md b/README.md
index 2d97fb7..a07c238 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,8 @@
 
 ## Legacy Documentation
 - [Prism 4 Demo](https://www.codeproject.com/Articles/254120/Prism-4-MEF-Application). Migrated to Prism 6 [link](http://dev.mitech.com.sg:3000/playground/prism4-demo)
+- [Prism 4 QuickGuide](./legacy/Prism4_QuickGuide.pdf)
+- [Prism 4 Guide](./legacy/Prism4_Guide.pdf)
 - [Prism 5](https://www.microsoft.com/en-sg/download/details.aspx?id=42572)
 - Another nice [link](https://www.cnblogs.com/DoubleChen/p/3687305.html)
 - Nuget : [Prism 4.1](https://www.nuget.org/packages/prism/4.1.0)
diff --git a/csharp-convention.md b/csharp-convention.md
index e449621..8c469ff 100644
--- a/csharp-convention.md
+++ b/csharp-convention.md
@@ -1,10 +1,11 @@
-# C-Charp Convention
+# C-Sharp Convention
 
 * [C# Framework version](https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/configure-language-version)
 * [What's new](https://learn.microsoft.com/en-us/dotnet/csharp/whats-new)
 
 ## Naming Convention
 * [Microsoft](https://learn.microsoft.com/en-us/dotnet/csharp/fundamentals/coding-style/coding-conventions)
+* [MSDN](https://learn.microsoft.com/en-us/dotnet/standard/design-guidelines/general-naming-conventions?redirectedfrom=MSDN)
 
 | Object Name               | Notation   | Length | Plural | Prefix | Suffix | Abbreviation | Char Mask          | Underscores |
 |:--------------------------|:-----------|-------:|:-------|:-------|:-------|:-------------|:-------------------|:------------|
@@ -18,4 +19,12 @@
 | Field name                | camelCase  |     50 | Yes    | No     | No     | Yes          | [A-z][0-9]         | Yes         |
 | Properties name           | PascalCase |     50 | Yes    | No     | No     | Yes          | [A-z][0-9]         | No          |
 | Delegate name             | PascalCase |    128 | No     | No     | Yes    | Yes          | [A-z]              | No          |
-| Enum type name            | PascalCase |    128 | Yes    | No     | No     | No           | [A-z]              | No          |
\ No newline at end of file
+| Enum type name            | PascalCase |    128 | Yes    | No     | No     | No           | [A-z]              | No          |
+
+* **Method Name** to start with verb. Eg. *Update*Projection(), *Calculate*Angle()
+
+## NameSpace Naming Convention [Microsoft](https://learn.microsoft.com/en-us/dotnet/standard/design-guidelines/names-of-namespaces)
+* `<Company>.(<Product>|<Technology>)[.<Feature>][.<Subnamespace>]`
+  * eg: `Mitech.Vision.Desktop`, `Mitech.Vision.Modules.Camera`, `MitechApp.Desktop`, `MitechLib.Modules.Recipes`, etc
+* `PascalCamelCase` convention
+* Use Plural names where appropriate
\ No newline at end of file
diff --git a/legacy/Prism4_Guide.pdf b/legacy/Prism4_Guide.pdf
new file mode 100644
index 0000000..a7b1080
Binary files /dev/null and b/legacy/Prism4_Guide.pdf differ
diff --git a/legacy/Prism4_QuickGuide.pdf b/legacy/Prism4_QuickGuide.pdf
new file mode 100644
index 0000000..3a4f0d7
Binary files /dev/null and b/legacy/Prism4_QuickGuide.pdf differ