Extension Method

A static method callable as though it were an instance method of another type.

What is Extension Method in C#?

Extension Method — A static method callable as though it were an instance method of another type.

static class StringExtensions
{
    public static bool IsBlank(this string text)
    {
        return string.IsNullOrWhiteSpace(text);
    }
}

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Updated September 27, 2026