First Character of String Lowercase - C# [duplicate]

Question

How can I make the first character of a string lowercase?

For example: ConfigService

And I need it to be like this: configService

Answer 1

This will work:

public static string? FirstCharToLowerCase(this string? str)
{
    if ( !string.IsNullOrEmpty(str) && char.IsUpper(str[0]))
        return str.Length == 1 ? char.ToLower(str[0]).ToString() : char.ToLower(str[0]) + str[1..];

    return str;
}

(This code arranged as "C# Extension method")

Usage:

myString = myString.FirstCharToLowerCase();