Connection database network-related or instance-specific errors occur when connecting to SQL Server, verify that the instance name is correct and that SQL Server is configured to allow remote connections.

Source: Internet
Author: User

If your connection string is the same

<add key= "ConnectionString" value= "server=;database=newstest;uid=sa;pwd=***"/>

or something like that.

<add key= "ConnectionString" value= "server=local;database=newstest;uid=sa;pwd=***"/>

And there is no grammatical error, it is recommended to try the way below

<add key= "ConnectionString" value= "server=.\sqlexpress;database=newstest;uid=sa;pwd=***"/>

Which is to put server= or server=local as server=.\sqlexpress.

Hope to be able to help the people who meet this problem.

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