C#

Join the IBM Z Skills team at UMD College Park to **inspire** the next generation of technologists to pursue roles on the mainframe! \- IBM will deliver an overview presentation on IBM Z and the critical role the platform plays across industries today\. \- Help introduce students to IBM Z Xplore\, IBM’s premier online learning platform\, giving them a clear path to begin hands\-on skills development immediately\. \- Highlight the wide range of career opportunities available in the industry\, helping students see how their interests and strengths connect to real roles in the field\.

You must read the following NVHC Sign-in Sheet Statement/Liability Disclaimer, **[https://nvhc.com/signin.pdf](https://nvhc.com/signin.pdf)** and then answer the question that you will see when you RSVP with "**I Accept**" to be permitted on the hike. **9.5 mile loop hike with 223 feet elevation gain** **Description:** Starting at **[Columbia Island Marina](https://boatingindc.com/columbia-island-marina/)** (Lady Byrd Johnson Park, GW Parkway, Arlington, VA; **GPS Coordinates**: 38°52'30.7"N 77°02'56.2"W We will proceed along the **[Mount Vernon Trail](https://www.nps.gov/gwmp/planyourvisit/mtvernontrail.htm)** towards **[Theodore Roosevelt Island](https://www.nps.gov/this/index.htm)** where we will walk around the **Swamp trail**, the island's main trail. From there we will cross the **Key Bridge** and climb the **[Exorcist Steps](https://www.trolleytours.com/washington-dc/exorcist-steps)** before heading down to the river. Our next destination will be **[Georgetown Waterfront park](https://www.nps.gov/places/georgetown-waterfront-park.htm)** where we will stop for **lunch** while enjoying a scenic view of the **Potomac river.** After lunch we will walk along the river past the **Lincoln Memorial** to the **14th Street bridge** and finish back at **Columbia Island Marina**. **Pace:** 2.5 to 2.75 mph while moving ***You must be able to hike this distance at this pace to successfully complete the outing*** **What to bring:** **:** Adequate hydration, also snack/lunch, and sturdy hiking shoes. **Restrooms** are available both at the Columbia Island Marina and on Theodore Roosevelt Island. **Dogs:** are **not** welcome on this hike. **[NVHC Dog Policy](https://tinyurl.com/nvhcdogpolicy).** **Weather** : weather for this location can be found **[HERE](https://weather.com/weather/today/l/f5eb957fcc631380629a5541b21a742eb7eeb5ad5ae988d2035003fb107d301f)**. **Where to meet:** we will meet in the parking lot of the **[Columbia Island Marina](https://boatingindc.com/columbia-island-marina/),** Lady Byrd Johnson Park, GW Parkway, Arlington, VA. Upon entering the Columbia Island marina, in Lady Bird Johnson park, turn left, I have a Honda Fit that will have the UV hatchback open. Thank you for being ready to hike at 9:15 so that we can get signed in and leave on time at 9:30 am. The hike will begin from Columbia island Marina parking lot. **Rehydration**: Island Time Bar n Grill in the marina is open again! Dawn K message me here or text to 703 533 9231

Join DC Metro Crafts for our first Thursday meetup. Bring your own cross stitch, knitting, crochet, or other portable craft. The Southwest Library is right off the Waterfront Metro. Tonight, we start at 6:15 (no room was available before then) and we're upstairs in Conference Room 2. Take the elevator to the second floor and the room is on your left. If you take the stairs, take two rights and the room is on your left.

It is supposed to be 60 degrees Thursday. Let’s take advantage with a walk at Brookside Gardens. We will meet to the right facing the visitors center. If anyone is interested we can go to lunch afterwards.

Bring a friend, bring family, and bring that neighbor that you kinda know... Come one, come all for some free table tennis. Note: Because we have been playing regularly for years, members tend not to RSVP. If there are any questions, feel free to message.

For the first half hour of class, beginners will learn 5 organ & spirit enlivening qigong exercises. After a brief meditative walk, beginners will learn the first of six section of Lao (old) Yang tai chi chuan as taught by Teacher Lu Hung Bin. Remember to wear comfortable loose-fitting clothing & flat comfortable shoes. For more information, call 301-466-5894 or email: info@dancinginsilence.com

**\*\*\*TO ATTEND THE EVENT, YOU MUST PURCHASE TICKETS THROUGH OUR WEBSITE \*\*\*** [https://www.pre-dating.com/baltimore-speed-dating/?utm_source=Meetup&utm_medium=event_listing&utm_campaign=Meetup](https://www.pre-dating.com/baltimore-speed-dating/?utm_source=Meetup&utm_medium=event_listing&utm_campaign=Meetup) Hosted by Pre-Dating Speed Dating, the experts, bringing people together since 2001! Our events have been featured on CNN, CBS, Axios, Miami New Times, TLC's 90 Day Fiance - The Single Life, Tampa Bay Times, Southbend Times, Citylink Magazine, Essence, The Wall Street Journal, Best of Baltimore, AM New York, Chicago Tribune, WINK FM, Woman's World Magazine, and 100s more -- but come see for yourself! Join us for a night of fun, flirtation, and possible romance at our singles speed dating event! If you're tired of swiping left and right on dating apps, speed dating is a great way to meet new people in person, in a relaxed, safe, and comfortable environment. **HOW IT WORKS:** We'll introduce you to at least 5, and up to 12 - or more - single women or men. Spend a little time with each one, during a series of 6-minute Pre-Dates. Then tell us who you'd like to speak with again & we'll do the rest! It's the modern, civilized, effective, and fun way to meet other professional-level singles. If you're finished with the games and ineffectiveness of online dating and apps, join us to share a wonderful evening of enjoyable conversation with interesting people... and maybe something magical will happen! **GET TICKETS:** A **Meetup RSVP is not a ticket**, you must purchase on our website. [https://www.pre-dating.com/baltimore-speed-dating/?utm_source=Meetup&utm_medium=event_listing&utm_campaign=Meetup](https://www.pre-dating.com/baltimore-speed-dating/?utm_source=Meetup&utm_medium=event_listing&utm_campaign=Meetup) Use Code MATCH5 for $5 off! **DOES IT WORK?** Yes! According to the New York Times, at a speed dating event, people like 2-3 out of 10 people they meet. Online daters only match with 1 in 100 or fewer of the profiles they study. This is the best way to meet new people, and it works! Just ask the thousands of people that have met at our events and had successful relationships and marriages. **WHAT DOES IT COST?** We put a lot of time and effort into creating the best singles events possible, so we collect a fee for our hard work. Our events are an excellent value at about $3 per introduction. Get your ticket for the best singles event in town. **NOTE FOR NEWCOMERS:** We post our events on various platforms. Our events often sell out, so expect plenty of fellow singles, regardless of the numbers you see here :) So what are you waiting for? Join us for some fun conversation with great new people... and maybe something more! Who will you meet? **GET TICKETS:** [https://www.pre-dating.com/baltimore-speed-dating/?utm_source=Meetup&utm_medium=event_listing&utm_campaign=Meetup](https://www.pre-dating.com/baltimore-speed-dating/?utm_source=Meetup&utm_medium=event_listing&utm_campaign=Meetup)

This month, we'll have a recorded talk, followed by discussion, on API design and single-header libraries. How should we structure and program libraries to impose as few usage constraints as possible? We’ll look at [the STB libraries](https://github.com/nothings/stb) and other examples as case studies. We're still at the West End Library - see the location in the sidebar for details. **Agenda:** \- 2pm \- 3pm: Library discussion \- 3pm \- 4pm: Open\-ended discussions\, presentations\, etc\. \- 4pm \- whenever: We'll go get food nearby\! **What we do** Presentations on lower-level, foundational programming topics, ethical software, knowledge sharing, mentoring, and discussion. **Who we are:** We are all about handmade software. Rather than focus on frameworks, heavy abstractions, and buzzwords - we typically create projects or research topics that build an understanding of foundational computing concepts, essential data structures, and hardware/software interaction. **What to bring?** Bring a laptop, project, or just a curious mind. If you're not sure you're ready to contribute, don't worry: we're all here to share our passions and hone our craft. **If you arrive late:** Please enter the room quietly as to not disrupt anyone that is presenting. You can take any empty seat.

You must read the following NVHC Sign-in Sheet Statement/Liability Disclaimer, [https://nvhc.com/signin.pdf](https://nvhc.com/signin.pdf) and then answer the question that you will see when you RSVP with "I accept" to be permitted on the hike. **10.5 miles with 250 feet elevation gain.** ***Let's hike the recently reopened Billy Goat B trail which has been closed for several years. One of my favorite sections, I'm glad it's back!*** This is a beautiful area along the scenic C&O Canal National Historical Park towpath. This trek will include a hike on Billy Goat B & C trails with great views of the Potomac River, as well as the roaring waters of Olmsted Island and the Great Falls overlook. This route includes a very scenic section of the towpath. **Description:** We'll start our hike on Billy Goat C trail and hike until we connect with the C&O Canal towpath. We'll hike to the Tavern visitor center for lunch break before we reconnect with the towpath. and make our way to Olmsted Island and the Great Falls Overlook. We'll then resume on the towpath until we cross over the canal onto Berma Road for a short distance where we reconnect to the towpath at Angler's Inn parking area. We're back on the towpath where we will connect to Billy Goat B trail. Note: There is one stream crossing on Billy Goat B which is fairly easily crossed by stone stepping. After completing Billy Goat B, we'll then connect back to the towpath and return to the trailhead parking. The pace will be about 2.5 mph. **Bring:** Adequate water/hydration, snacks/lunch, and sturdy hiking shoes since there are some rocky areas and tree roots on both Billy Goat B & C. Restrooms are available at the Carderock Picnic Area parking lot where we start as well as at the Tavern Visitor Center. Hiking poles may be useful if you normally use them. **Trailhead:** We will meet in the Carderock Picnic Grounds parking lot in Carderock Recreation Area. Please plan on being there at 8:45am so we can get everyone signed in and start the hike on time. **Dogs are welcome.** Dog Policy [https://tinyurl.com/nvhcdogpolicy](https://tinyurl.com/nvhcdogpolicy) ***Please note: Dogs are not allowed on the Olmsted Island boardwalk, so you will have to wait while the group completes the Olmsted Island walk***. **There are no fees.** Map of Hiking Trails at Great Falls, Maryland: [https://www.nps.gov/choh/planyourvisit/upload/Great-Falls-Hiking-Map.pdf](https://www.nps.gov/choh/planyourvisit/upload/Great-Falls-Hiking-Map.pdf) **Directions to Carderock Picnic Grounds Parking at Carderock Recreation Area:** From I-495, take the exit for Clara Barton Pkwy, continue on the Pkwy until you see the exit for Carderock near the Naval Surface Warfare Center. After exiting at Carderock, you will pass under the towpath tunnel. Turn left after going under the towpath tunnel and continue into the picnic grounds parking lot. **GPS 38.97122, -77.19874** Any questions, please message me here or text/call @202-528-0456. If you text me, please include your name.

DC Code and Coffee is an inclusive, informal co-working session. It's community-led and community-run by devs, for devs. People of all skill levels attend. Whether you’re dev-curious, aspiring, or a professional developer, we’d love to have you! Come chat or learn to code on a Sunday afternoon with coffee and cool-inclusive people. Bring your laptop! We typically meet every month on the weekend. **Join our online community!** For all things Tech in DC and to get latest updates and tech events from the DMV area, join the [DCTech Slack](https://dctech.chat/). All DC Code & Coffee announcements are in the #dccodecoffee channel **How it works** Near the beginning of the event, we do an introduction circle. You say your name, what you can help others with, and what you would like help with. You can also share job opportunities. After the introduction circle, everything is self-organized. **Event Host and Directions** We are meeting in the big meeting room at the back of the library.

All levels of Cantonese proficiency are welcome! 歡迎各水平嘅廣東話愛好者！

You must read the following NVHC Sign-in Sheet Statement/Liability Disclaimer, **[https://nvhc.com/signin.pdf](https://nvhc.com/signin.pdf)** and then answer the question that you will see when you RSVP with **"I Accept"** to be permitted on the hike. **About a 7 mile Loop** with **minimal elevation gain**. Most of the hike will be on **pavement.** **Treat** yourself to a lovely visit to the **[United States Botanic Garden](https://www.usbg.gov/)**. It is the oldest continuously operating public garden in the United States. During the late 18th century, George Washington had a dream of a national botanic garden and was instrumental in establishing one on the National Mall in 1820. To **Prepare our Visit** to this '**secret garden',** you might want to first take a **[Virtual Tour](https://www.usbg.gov/visit/tours/take-virtual-tour) ;** an **[Audio Tour](https://www.usbg.gov/audio-tours);** or a **[Video Tour](https://www.youtube.com/playlist?list=PLGr704ibVLOZ7rPU5NyL7_eYKxL197x88)** of the **[gardens.](https://www.usbg.gov/)** From there we will head over to the **[Sculpture Garden Pavilion Cafe](https://sculpturegardenpavilioncafe.smartonlineorder.com/)**[ ](https://sculpturegardenpavilioncafe.smartonlineorder.com/) for **[lunch](https://sculpturegardenpavilioncafe.smartonlineorder.com/).** You can eat at the cafe or bring your own lunch. **Description:** We will leave from from **[Columbia Island Marina](https://boatingindc.com/columbia-island-marina/)**, head along the **Potomac River** on the **Mount Vernon Trail,** cross **Memorial Bridge** to the **Mall.** We will admire the view of **Mall** from the **Monument**. From there we continue along the Mall to the **[U.S. Botanic Garden](https://www.usbg.gov/). After Lunch** at the **[Sculpture Garden Pavilion Cafe](https://sculpturegardenpavilioncafe.smartonlineorder.com/)** we will return to the Marina over the **14th street bridge**. **Pace**: Pace is about **2.5 mph** while moving. **Bring:** \- Hydration and snacks as you desire or purchase lunch at the Sculpture Garden Pavilion Cafe\. -The route is basically level. Most of the hike will be on paved surfaces so wear comfortable walking shoes. \- Dress in layers for the weather paying special attention to your head/hands\. **Dogs:** Dogs are NOT welcome on this hike in accordance with the **[NVHC Dog Policy](https://tinyurl.com/nvhcdogpolicy).** **Weather:** weather in this location is **[HERE](https://weather.com/weather/today/l/c4025fdf0177c872b7fc2e0d09e7c523995ef49e21145e2d2438fe08649ca9e8)**. **Meetup Location:** We will meet up at Columbia Island Marina at 9:15 am to get checked in and ready to leave by 9:30 am. GPS Coordinates: **38.87651,-77.04947** **Maps** **[Map National Mall](https://npplan.com/wp-content/uploads/2016/09/Mall-Map.pdf)**

Improv workshop at Library. We will teach basics of Improvisation and rules before each game. Experienced and newbies alike are welcome to attend/participate. If you don't want to perform this time around, feel free to come enjoy the workshop and relax. If you need to cancel, please change your status to "will not attend."

## Details - Please read all below before you sign up **Cost:** Free **Court Type:** Outdoor Grass **Level:** B/BB/A **Transportation:** Parking will be right by the grass. **What to bring:** at least 3 bottles of water and a ball/net if you have one. **10 persons per net max** **Host's Philosophy on this event:** The purpose of this meetup is to create a fun and supportive environment where we can improve our skills, enjoy competitive games, and connect socially. While we do aim to play seriously and challenge ourselves, the focus is more on growth and enjoyment than simply winning at all costs. That’s why the title doesn’t include “competitive” or “social”—we want a healthy mix of both. This is a space where you won’t be judged for making mistakes, but we do expect a mindset geared toward learning and getting better over time. That said, this group isn’t intended for total beginners; a basic understanding of the game is expected so that everyone can contribute to meaningful and engaging matches. The host holds the right to remove you from the game if they believe that you are at a C level. **Skill Level:** 1. **If you want to know your level, please see the link below:** [Smiley Social Volleyball Levels](https://docs.google.com/document/d/1PojSi4qdlRsv1msCHhvpQ43iDc4FfzQwpWCc3kafVMY/edit) **YouTube:** The games may be recorded and uploaded to our channel here: Let the host know if you have an issue with this. [Youtube](https://www.youtube.com/@mp02626) **ATTENDANCE:** **Player Selection:** Regulars > League Members > Your Vibe > Skills > \*Your Attendance Ratio > New Members \* If you have 3 events attended and 6 events you dropped off, you may or may not be invited. Anyone with a drop-off level of -.50 or lower. The host takes attendance very seriously. Please remove yourself from the event (if you can't make it) as early as possible to allow others to join. You will be marked as a ***no-show*** if you don't show up to the event, including removing yourself 60 min or less before the event start time. [Smiley Social Rules](https://docs.google.com/document/d/1HrG35p_0M08leRvCp8XWG3CMkr_GL928XFabl5T6Dvg/edit) **Q&A** * Bringing your dog is welcome and encouraged. * *Can I come if I don't know how to play?* No, you may not. The host does teach a beginner's volleyball class that you may attend on Saturdays. * *Can I be late or leave early?* The host expects you to be there **on time** and leave on time. If you need to come late or leave early, please let the host know ahead of time. * *Can I come even if I am not on the going list?* No, sorry **Smiley Social documents:** 1. [Group Rules](https://docs.google.com/document/d/1HrG35p_0M08leRvCp8XWG3CMkr_GL928XFabl5T6Dvg) 2. [Liability Waiver](https://docs.google.com/document/d/1W2mq-7m99lmvd7gdWYaSUFtvVg4UGnzV6koafAbHmco) 3. [Volleyball Levels](https://docs.google.com/document/d/1PojSi4qdlRsv1msCHhvpQ43iDc4FfzQwpWCc3kafVMY/)

Window functions have nothing to do with the Windows operating system but provide a “window” to a result set when used in SQL queries. They are powerful, set-based methods to view data in unexpected ways. Window functions provide easy, set-based solutions to solve some common problems: * Using running totals * Performing operations in intervals * Identifying data gaps and islands * Performing aggregates without losing detail Many people are confused by window functions and do not know how to use them properly. This session will explore window functions, how they work, and how to use them. Demonstrations with several examples will solidify how window functions can simplify queries and make them more powerful.

On Thursday, March 12, 2026, we will meet at the TEKSystems offices at 700 N Hurstbourne Pkwy. Doors will open at 6:00 p.m., and the presentations will begin sharply at 6:30 p.m. Along with an excellent presentation, TEKsystems will provide food. Please RSVP so we know how much food to order. Afterward, we will go to Brick House Tavern for drinks and food to continue the conversation. The session will also be broadcast at https://twitch.tv/TaleLearnCode. ### Much Ado About Nullable - C# Nullable Reference Types Explained In 2019 (C# 8.0) Microsoft introduced a feature that has generated a lot of confusion, debate and outright dissent. I'm talking about Nullable Reference Types. In this presentation, I we dig into this feature, explore why it exists, what problem it tries to solve, how it works, and how people have critiqued it, so that you as a programmer can decide if and how you want to use it.

Come out to Improving for our monthly iOS and Mac meetings. This Month's Presentation: Nothing yet. (You should volunteer). What is Cocoaheads (http://cocoaheads.org/)? CocoaHeads is a group devoted to discussion of Apple Computer's Cocoa Framework for programming on MacOS X and iOS (including the iPhone, iPad and Apple Watch). During monthly meetings, members present on their projects and offer tutorials on various programming topics. What is BuckeyeCocoa (http://buckeyecocoa.org/)? BuckeyeCocoa is a group of Objective-C/Swift developers/enthusiasts. We host monthly Cocoaheads and near-weekly NSCoder meetings in Columbus, Ohio. The meetings are free to attend. Presentations! Presenters welcome! We are always in need of people willing to present material. Any Swift and/or Objective-C related topic is welcome. Times can be 5 minutes (i.e. lightning talks) to a maximum of 2 hours. Interested? Contact info is on the BuckeyeCocoa website. To volunteer for a presentation contact us at @BuckeyeCocoa on Twitter. Follow us on Twitter! @BuckeyeCocoa (https://twitter.com/#!/Buckeyecocoa/) For more information: http://buckeyecocoa.org/

We will show a variety of methods for building agents that run in Microsoft Foundry. This covers the different types of agents: Prompt, Multi, and Hosted, as well as the development lifecycle using evals and traces.

**Important time note:** Please plan on arriving between 5:30 and 6:00 as the elevators lock after 6 and you'll need to message us and we'll need to come get you. The building address is 4450 Bridge Park The entrance is 6620 Mooney St, Suite 400 **Abstract** TBD **YouTube Link** TBA

Columbus Code & Coffee is an inclusive, informal co-working session. People of all skill levels attend, and we love it that way. Many people (optionally) bring projects to work on, and many other people (optionally) socialize the entire time. It's entirely up to you! **What to Expect at the Intro Circle** \~\~\~\~\~\~\~\~\~\~\~\~\~ Near the beginning of the event (1:30 pm), we do a standup: * Organizer announcements, updates, and logistics Round 1 - (7 secs max): * Your name * What you're working on * What you can help others with Round 2: * Community events you wanna plug. If none, that's cool too. Round 3: * Job opportunities you're hiring for OR announce that you are looking for one. If none, that's cool. After the introduction circle, everything is self-organized! Feel free to work alone, pair up, attend one of our workshops/presentations, or mingle!

This is a relaxed, community-driven Unity GameDev meetup. There’s no strict agenda this time — just developers getting together to talk shop, share projects, and exchange ideas. **Some topics that may come up (based on attendee interest):** • Frame Debugger & performance tooling • Addressables & additive scene workflows • Input System, localization, responsive UI • AI integration approaches • DevOps & LiveOps experiences • Full lifecycle: idea → cross-platform publishing • Favorite Asset Store tools and hidden gems • Weird Unity quirks we’ve all run into *Nothing is locked in.* Bring a project if you’d like. Bring a question. Bring a lesson learned. Or just come hang out and meet other developers. All skill levels welcome!