divclass="comment""你的评论在这里"onmouseover="...
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<p><strong>异常详细信息: </strong><span style="font-family:Arial;">System.NullReferenceException: 未将对象引用设置到对象的实例。<br /><br /></span><strong>源错误:</strong><span style="font-family:Arial;"> <br /><br /></span><table width="100%" bgcolor="#ffffcc"><tbody><tr><td><code></code><pre>行 22: public SqlConnection GetConnection() 行 23: { <span style="color:red;">行 24: string myStr = ConfigurationManager.AppSettings["ConnectionString"].ToString(); </span>行 25: SqlConnection myConn = new SqlConnection(myStr); 行 26: return myConn;</pre></td></tr></tbody></table></p><p>这个应该怎么弄啊,试了好多种办法都还是没法</p>