System.Data.Common.DbConnectionOptions.AppendKeyValuePairBuilder C# (CSharp) Method

        internal static void AppendKeyValuePairBuilder(StringBuilder builder, string keyName, string keyValue, bool useOdbcRules)
        {
            ADP.CheckArgumentNull(builder, nameof(builder));
            ADP.CheckArgumentLength(keyName, nameof(keyName));

            if ((null == keyName) || !s_connectionStringValidKeyRegex.IsMatch(keyName))
            {
                throw ADP.InvalidKeyname(keyName);
            }
            if ((null != keyValue) && !IsValueValidInternal(keyValue))
            {
                throw ADP.InvalidValue(keyName);
            }

            if ((0 < builder.Length) && (';' != builder[builder.Length - 1]))
            {
                builder.Append(';');
            }

            if (useOdbcRules)
            {
                builder.Append(keyName);
            }
            else
            {
                builder.Append(keyName.Replace("=", "=="));
            }
            builder.Append('=');

            if (null != keyValue)
            {
                // else <keyword>=;
                if (useOdbcRules)
                {
                    if ((0 < keyValue.Length) &&
                        (('{' == keyValue[0]) || (0 <= keyValue.IndexOf(';')) || (0 == string.Compare(DbConnectionStringKeywords.Driver, keyName, StringComparison.OrdinalIgnoreCase))) &&
                        !s_connectionStringQuoteOdbcValueRegex.IsMatch(keyValue))
                    {
                        // always quote Driver value (required for ODBC Version 2.65 and earlier)
                        // always quote values that contain a ';'
                        builder.Append('{').Append(keyValue.Replace("}", "}}")).Append('}');
                    }
                    else
                    {
                        builder.Append(keyValue);
                    }
                }
                else if (s_connectionStringQuoteValueRegex.IsMatch(keyValue))
                {
                    // <value> -> <value>
                    builder.Append(keyValue);
                }
                else if ((-1 != keyValue.IndexOf('\"')) && (-1 == keyValue.IndexOf('\'')))
                {
                    // <val"ue> -> <'val"ue'>
                    builder.Append('\'');
                    builder.Append(keyValue);
                    builder.Append('\'');
                }
                else
                {
                    // <val'ue> -> <"val'ue">
                    // <=value> -> <"=value">
                    // <;value> -> <";value">
                    // < value> -> <" value">
                    // <va lue> -> <"va lue">
                    // <va'"lue> -> <"va'""lue">
                    builder.Append('\"');
                    builder.Append(keyValue.Replace("\"", "\"\""));
                    builder.Append('\"');
                }
            }
        }

 public static void AppendKeyValuePair(StringBuilder builder, string keyword, string value, bool useOdbcRules)
 {
     DbConnectionOptions.AppendKeyValuePairBuilder(builder, keyword, value, useOdbcRules);
 }