VB string functions in C#

Just in case if anyone needs it.
//-----------------------------------------------------------------------
// <copyright file="Strings.cs" company="devqueries">
//     Author: Neal Gabriel
//     No rights reserved.
// </copyright>
//-----------------------------------------------------------------------

namespace Helper
{
    using System;

    /// <summary>
    /// Strings functions avialable in VB
    /// </summary>
    public class Strings
    {
        /// <summary>
        /// Left of string
        /// </summary>
        /// <param name="param">String param</param>
        /// <param name="length">Legnth is pulled out from left of the string</param>
        /// <returns>String that is pulled out</returns>
        public static string Left(string param, int length)
        {
            return param.Substring(0, length);
        }

        /// <summary>
        /// Right of string
        /// </summary>
        /// <param name="param">String param</param>
        /// <param name="length">Left to tbe pulled from right</param>
        /// <returns>String the is pulled out</returns>
        public static string Right(string param, int length)
        {
            return param.Substring(param.Length - length, length);
        }

        /// <summary>
        /// Mid of string
        /// </summary>
        /// <param name="param">String param</param>
        /// <param name="startIndex">Start index to be pulled</param>
        /// <param name="length">Length from the start index</param>
        /// <returns>String that is pulled out</returns>
        public static string Mid(string param, int startIndex, int length)
        {
            return param.Substring(startIndex, length);
        }

        /// <summary>
        /// Mid of string
        /// </summary>
        /// <param name="param">String param</param>
        /// <param name="startIndex">Start index to be pulled</param>
        /// <returns>String that is pulled out</returns>
        public static string Mid(string param, int startIndex)
        {
            return param.Substring(startIndex);
        }

        /// <summary>
        /// Get content in string
        /// </summary>
        /// <param name="original">String param</param>
        /// <param name="containsKey">Contains key</param>
        /// <returns>Index of the string</returns>
        public static int InStr(string original, string containsKey)
        {
            return original.IndexOf(containsKey, StringComparison.Ordinal) > -1 ? original.IndexOf(containsKey, StringComparison.Ordinal) : 0;
        }

        /// <summary>
        /// Format datetime
        /// </summary>
        /// <param name="param">Datetime param</param>
        /// <param name="format">Format of datatime object</param>
        /// <returns>Formatted datetime as string</returns>
        public static string Format(DateTime param, string format)
        {
            return param.ToString(format);
        }

        /// <summary>
        /// Get length of string
        /// </summary>
        /// <param name="param">String param</param>
        /// <returns>Length of string</returns>
        public static int Len(string param)
        {
            return param == null ? 0 : param.Length;
        }
    }
}