DataModelSanitization.cs

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using System.Text.RegularExpressions;
using System.Threading;

namespace PhotoSharingApp.AppService.Shared.Validation
{
    /// <summary>
    /// Various data sanitization functions.
    /// </summary>
    public static class DataModelSanitization
    {
        /// <summary>
        /// Formats string to TitleCase.
        /// </summary>
        /// <param name="input">String to modify.</param>
        /// <returns>Modified string.</returns>
        public static string ToTitleCase(this string input)
        {
            if (input == null)
            {
                return null;
            }

            return Thread.CurrentThread.CurrentCulture.TextInfo.ToTitleCase(input.ToLower());
        }

        /// <summary>
        /// Remove leading/trailing spaces and
        /// replace multiple white spaces with one white space.
        /// </summary>
        /// <param name="input">String to modify.</param>
        /// <returns>Modified string.</returns>
        public static string TrimAndReplaceMultipleWhitespaces(this string input)
        {
            if (input == null)
            {
                return null;
            }

            return Regex.Replace(input.Trim(), @"\s+", " ");
        }
    }
}