OpenQA.Selenium.By.ClassName C# (CSharp) Method

        public static By ClassName(string classNameToFind)
        {
            if (classNameToFind == null)
            {
                throw new ArgumentNullException("classNameToFind", "Cannot find elements when the class name expression is null.");
            }

            if (new Regex(".*\\s+.*").IsMatch(classNameToFind))
            {
                throw new IllegalLocatorException("Compound class names are not supported. Consider searching for one class name and filtering the results.");
            }

            By by = new By();
            by.findElementMethod =
                (ISearchContext context) => ((IFindsByClassName)context).FindElementByClassName(classNameToFind);
            by.findElementsMethod =
                (ISearchContext context) => ((IFindsByClassName)context).FindElementsByClassName(classNameToFind);

            by.description = "By.ClassName[Contains]: " + classNameToFind;
            return by;
        }

 /// <summary>
 /// Gets a mechanism to find elements by their CSS class.
 /// </summary>
 /// <param name="classNameToFind">The CSS class to find.</param>
 /// <returns>A <see cref="OpenQA.Selenium.By"/> object the driver can use to find the elements.</returns>
 public static new SeleniumBy ClassName(string classNameToFind) => SeleniumBy.ClassName(classNameToFind);