VB.NET / SQL - How to check if a user / value exists in a Database

G'day guys, In this video I will show you how to check if a value has been used before using VB.NET with SQL.

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[faustinongudiavita]

Good morning Andrew, I´m thankful with this video, I want to how can i check if the user record esxist before update the field?

[yuanyi]

Sorry that if I bother you
May I ask if you have made a video about searching in database of visual basic of visual studio 2015?
I have tried a lot of tutorials but I have never success
I want to perform the kind of search that if you enter words in a textbox and press the button 'search', the result will be shown.
How can I do it in a fast and easy way?
Thank you very much!

[mhvdm]

Can you make a tutorial on how i can make a database that will sync over computers. I need that program to have a working login system that will sync over the computers because my class needs it to manage infomation between eachother. I also want to make like a posting area, where people in my class can write things and post it, and for example, when he posts it on his computerr, i will be able to view what he posted. And as an Admin i need to be able to delete posts and stuff. I am in High School, and as a part of the line i am going, we need to start a company. And making that program work would be amazing.