System.Data.SqlClient.MetaType.PromoteStringType C# (CSharp) Method

        internal static MetaType PromoteStringType(string s)
        {
            int len = s.Length;

            if ((len << 1) > TdsEnums.TYPE_SIZE_LIMIT)
            {
                return s_metaVarChar; // try as var char since we can send a 8K characters
            }
            return MetaNVarChar; // send 4k chars, but send as unicode
        }