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public string LeftStringFunction(string sValue, int iMaxLength)
{
    //Check if the value is valid
    if (string.IsNullOrEmpty(sValue))
    {
        //Set valid empty string as string could be null
        sValue = string.Empty;
    }
    else if (sValue.Length > iMaxLength)
    {
        //Make the string no longer than the max length
        sValue = sValue.Substring(0, iMaxLength);
    }

    //Return the string
    return sValue;
}

public string RightStringFunction(string sValue, int iMaxLength)
{
    //Check if the value is valid
    if (string.IsNullOrEmpty(sValue))
    {
        //Set valid empty string as string could be null
        sValue = string.Empty;
    }
    else if (sValue.Length > iMaxLength)
    {
        //Make the string no longer than the max length
        sValue = sValue.Substring(sValue.Length - iMaxLength, iMaxLength);
    }

    //Return the string
    return sValue;
}