Added ONETUG presentation post

Author: ProgrammerAL

src/ProgrammerAl.Site.Content/Posts/20250910_ONETUGSeptember2025/post.md

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+Title: ONETUG Meetup September 2025
+Published: 2025/09/10
+Tags:
+
+- Meetup
+- C#
+
+Presentations:
+- Id: 1
+  SlidesRootUrl: https://raw.githubusercontent.com/ProgrammerAL/Presentations-2025/main/onetug-meetup-september-2025
+
+---
+
+## ONETUG September 2025
+
+The Orlando .NET Developers Gropu (aka ONETUG) meetup group invited me to speak in their September 2025 meetup on Nullable Reference Types in C#: https://www.meetup.com/onetug/events/310624118
+
+## Acount null! in C#
+
+<div class="post-multiple-links-div">
+  <a class="post-session-content-link" target="_blank" href="https://github.com/ProgrammerAL/Presentations-2025/tree/main/onetug-meetup-september-2025">View Session Content on GitHub</a>
+  <a class="post-view-session-content-link" href="/posts/20250910_ONETUGSeptember2025/slides/1">View Slides in Browser</a>
+</div>
+
+__Session Abstract__: 
+Null references are a problem that can show up anywhere. As developers, we have to litter out code with null checks. Thankfully C# has a feature to help with that, Nullable Reference Types (NRTs). They utilize a mix of syntax and special C# Attributes to enable null checking at compile time. It's not a perfect system, but it's WAY better than not using NRTs.
+
+In this session we'll review (and demo!) the different ways Nullable Reference Types help us when something may be null, by talking about:
+- The helpful NRT C# syntax and attributes
+- How NRT code is different for object deserialization
+- Cases where NRTs aren't as helpful as we'd like them to be
+
+