C#

Most people who search convert object to JSON without escape characters C# just ran JsonSerializer.Serialize on a name like Tom & Jerry’s and got this back: Quick answer: set Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping in JsonSerializerOptions. Use it only for JSON sent as UTF-8, never inside an HTML page. I tested every fix on .NET 10 with … Read more >>

The safest way to convert string to double in C# is double.TryParse with an explicit culture. It returns false on bad text instead of crashing: Every snippet below ran on .NET 10 against a 2026 fuel log, including blank input, European commas and numbers too big for a double. double.Parse: Convert a String to Double … Read more >>

Calling Random.Next in a loop is everyone’s first try to generate random numbers in C# without repeating, and it fails because nothing stops a repeat. Here’s my raffle draw for six tickets out of 50: Quick answer: put the range in an array, call Random.Shared.Shuffle (.NET 8+) and take the first N. I ran it … Read more >>

Blank customer names kept slipping into a Dallas client’s CRM import because my code only tested for null. For a C# check if string is null or empty, call string.IsNullOrEmpty(value). If spaces should count as empty too, use string.IsNullOrWhiteSpace(value). In this tutorial, I’ll go through the C# check if string is null or empty options … Read more >>

The usual way to check for null in C#, if (order == null), once skipped real orders in a client’s checkout. Their Order class overloaded ==, so an empty cart compared equal to null. Quick answer: write order is null or order is not null. The compiler never calls an overloaded operator for those patterns. … Read more >>

To convert int to binary string with leading zeros in C#, call ToString(“B8”) on .NET 8 or later, or Convert.ToString(n, 2).PadLeft(8, ‘0’) on older frameworks: Quick answer: the number after B is the minimum digit count, so B8 turns 10 into 00001010. I ran both on .NET 10, plus negative numbers, nibble grouping and parsing … Read more >>

Airport codes, state abbreviations and 20-character receipt lines all need the start of a string. To get the first N characters of a string in C#, call s.Substring(0, n), or use the range s[..n] on C# 8 and later. In this tutorial, I’ll line up the options for the C# get first N characters of … Read more >>

Use string for text you build once or glue together from a few pieces, and use StringBuilder when you append inside a loop. That’s the practical difference between string and StringBuilder in C#: a string can’t change, so every += makes a full new copy. I built the same 20,000-line CSV of US orders both … Read more >>

To remove a character from a string in C#, call Replace with the character as a string and an empty string as the replacement. It deletes every occurrence in one line: Need only the first or last match instead? That’s Remove plus IndexOf. I ran each method below on .NET 10 with US phone numbers, … Read more >>

Here’s a bug we catch in code reviews every month: DateTime.Parse(“03/04/2026”) returns March 4 on a US server and April 3 on a UK one. Same line, two dates, no error. Quick answer: to convert string to DateTime in C#, always pass the culture: DateTime.Parse(text, CultureInfo.GetCultureInfo(“en-US”)). Use TryParse for user input and ParseExact when you … Read more >>