SQL Server 2012连接字符串在经典ASP（VBScript）中工作正常，但在ASP.NET C＃项目中不起作用

Question

I have a scenario just like below:

I have a SQL Server Database and I do make operations to SQL server from my classic asp project. I needed to do some other stuffs into the same DB from another project which is written in ASP.NET C# . I did use a host address in connection string which was provided by hosting provider(Say, the host address is sqlxx.123xxx\\inst_xyz ). They also provided an IP with a port to connect the DB, which only works in SQL Server Management Studio . In the webconfig of C# project if I use the IP then it connects from my local dev machine. But it doesn't work after deploying to hosting.

Again, if I use sqlxx.123xxx\\inst_xyz as host address in classic ASP then it works. The IP doesn't work here. My question is, host sqlxx.123xxx\\inst_xyz works in classic ASP, IP works in ASP.NET C# in local IIS, but what will be the host for ASP.NET C# in hosting server ?

Please Note that, classic ASP project is in the main domain and ASP.NET C# project is in a sub domain of the main domain.

If I use either of the hosts(sqlxx.123xxx\\inst_xyz or IP), I get an error which states exactly like below :

A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)**

Answer 1

Try one of these two:

1. Put a @ in front of your connection string: @"sqlxx.123xxx\\inst_xy"
2. Double the \\ in the connection string, to \\\\ : "sqlxx.123xxx\\\\inst_xy"

I'm thinking the backslash needs escaping.

Answer 2

Put this:

<add key="myCon" value="Server=this_my_host;database=dbname;User Id=myuser;Password=dbpass;"/>

and Remove <connectionStrings> .

If you are connecting with your Remote host then you must use the <appSettings> not the <connectionStrings> string.