C#

If you need to compare two strings character by character in C#, loop over the indexes up to the shorter length with Math.Min, return the first index where a[i] != b[i], and count a leftover tail as a difference. For a plain yes or no, or the length of the matching start, span methods like … Read more >>

Many C# guides still chain == checks with || to test one input against a list. It works, but every new value adds a clause, and ignoring case makes the line twice as long. The cleaner way to compare string with multiple values in C# is the is "AZ" or "CA" pattern for a short … Read more >>

Turning a C# list into a comma separated string takes one line: string.Join(“, “, cities). It turns Austin, Dallas, Houston and El Paso into one string you can drop into a label, a log line or an email. In this tutorial, I’ll take one small US customer list through every C# list to comma separated … Read more >>

Got a list of states and need to know whether “Texas” is in it? In C#, a string array contains check is one line: states.Contains(“Texas”) returns true or false. In this tutorial, I’ll walk you through every flavor of the C# string array contains question: exact match, ignore case, substring, StartsWith, wildcard, null elements, multiple … Read more >>

Need to convert number with comma to decimal in C#? Call decimal.Parse with NumberStyles.Number and an explicit culture, so the comma is read as a thousands separator: That turns “1,234,567.89” into a real decimal you can do math with. I ran every snippet below on .NET 10 with 2026 sales numbers, including the bad input … Read more >>

To convert a char array to string in C#, pass the array to the string constructor: new string(chars). It copies every character into a new string in one call. If you’ve tried chars.ToString() first, you’ve probably seen System.Char[] instead of your text. Arrays don’t override ToString(), so you get the type name. I ran every … Read more >>

Need to convert string to byte array in C#? Call Encoding.UTF8.GetBytes(text). UTF-8 can store every character, and it’s what web APIs, JSON and most files expect: Four characters became 5 bytes, because é needs two. I ran every example below on .NET 10, from the ASCII trap to hex input, spans and the BOM. Encoding.UTF8.GetBytes: … Read more >>

The first thing most people type to sort an array in C# is var sorted = Array.Sort(prices);, and the compiler stops right there: Array.Sort sorts the array you pass in place and returns void, so call it on its own line and keep using prices. We’ll build a state population ranking on .NET 10, one … Read more >>

Your sales report lists January first, but the dashboard wants the newest month on top. To reverse an array in C#, call Array.Reverse(arr). It flips the array in place in one line. In this tutorial, I’ll walk through eight ways to reverse an array in C#, from the built-in method to loops that skip Reverse() … Read more >>

Say you’re taking RSVPs for an Austin C# meetup on March 12, 2026, and nobody knows if 4 or 40 people will sign up. A plain array can’t help, because its size is fixed the moment you create it. A dynamic array in C# is a List<T>: it wraps an array and swaps in a … Read more >>