How could this reference to a string be causing a Null reference Exception?
这怎么能参考字符串会引起空引用异常？
A detail message is a String that describes this particular exception.
详细信息是个字符串，描述此特定异常。
If no connection string is found with the specified name, an exception is thrown.
如果没有找到有具体指定名称的连接字符串，就会抛出一个异常。
Every exception consists of an error code and a text string that describes the source.
每个异常都由错误代码和描述错误起因的文本字符串组成。
Each sentence in a description string of an exception should end in a period.
在异常的描述字符串中，每个句子都应以句号结尾。
Each sentence in a description string of an exception should end in a period.
在异常的描述字符串中，每个句子都应以句号结尾。
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