Extension Methods in C#

Extension Methods in C# — a practical guide to C# extension methods with clear examples you can reuse in real projects.

C# Tutorial Series (85/121). Prefer one article? Read the complete C# tutorial.

Short description

Keep extensions focused; don’t hide expensive operations.

Extension

static class StringExt
{
    public static bool IsEmpty(this string? s) => string.IsNullOrEmpty(s);
}