ASP.NET偶崩溃了解决思路

ASP.NET偶崩溃了
string user_name;
user_name = "shanying";
com.CommandText = "insert into " + user_name + "_single_selected select top " + TextBox_count_multi.Text + " * from single_select where id not in (select id from " + user_name + "_single_selected) order by NEWID()";
问题肯定是出在user_name 身上，但我无法理解这个问题。因为如果把所有的user_name替换成"shanying"，则执行结果正确。现在这样子出错无法执行。

------解决方案--------------------------------------------------------
无法理解？？你按照下面红色部分输出一下，然后拿到查询分析器里执行看看。

string user_name;
user_name = "shanying";
string strSQL = "insert into " + user_name + "_single_selected select top " + TextBox_count_multi.Text + " * from single_select where id not in (select id from " + user_name + "_single_selected) order by NEWID()";
Response.Write(strSQL); //检查一下表名是不是你期望的那个？？
com.CommandText = strSQL;
------解决方案--------------------------------------------------------

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引用:
无法理解？？你按照下面红色部分输出一下，然后拿到查询分析器里执行看看。

string user_name;
user_name = "shanying";
string strSQL = "insert into " + user_name + "_single_selected select top " + TextBox_count_m……

------解决方案--------------------------------------------------------

探讨

引用:

引用:
无法理解？？你按照下面红色部分输出一下，然后拿到查询分析器里执行看看。

string user_name;
user_name = "shanying";
string strSQL = "insert into " + user_name + "_single_selected se……