Using LINQ to Identify Empty Text Boxes in C#

There are umpteen ways to determine whether or not a TextBox in a group of TextBoxes is empty. Usually whilst doing Form validation, you need to ensure all data has been filled in. A quick and easy way, with the help of LINQ, is as follows:

var emptyTextBox = Controls.OfType().FirstOrDefault(t => string.IsNullOrEmpty(t.Text));if (emptyTextBox != null){//Add code here if all textboxes were NOT filled in}else{//Add code here if all textboxes were filled in}

You create an object that will host the result of the LINQ query. The LINQ query looks through all the controls on the form, determines if the current control is a TextBox, then checks to see if the TextBox is empty or not. If there is a TexBox that is not empty it will exit the query and the object will host the TextBox that is empty. You then simply do an If check. If no controls have been returned from LINQ, every TextBox has been filled in and your validation passes.

Share the Post:
Share on facebook
Share on twitter
Share on linkedin


The Latest

your company's audio

4 Areas of Your Company Where Your Audio Really Matters

Your company probably relies on audio more than you realize. Whether you’re creating a spoken text message to a colleague or giving a speech, you want your audio to shine. Otherwise, you could cause avoidable friction points and potentially hurt your brand reputation. For example, let’s say you create a

chrome os developer mode

How to Turn on Chrome OS Developer Mode

Google’s Chrome OS is a popular operating system that is widely used on Chromebooks and other devices. While it is designed to be simple and user-friendly, there are times when users may want to access additional features and functionality. One way to do this is by turning on Chrome OS

homes in the real estate industry

Exploring the Latest Tech Trends Impacting the Real Estate Industry

The real estate industry is changing thanks to the newest technological advancements. These new developments — from blockchain and AI to virtual reality and 3D printing — are poised to change how we buy and sell homes. Real estate brokers, buyers, sellers, wholesale real estate professionals, fix and flippers, and beyond may