Hi Everybody

In Sql Server Management Studio, When I choose the SqlServer Authentication, I can connect the server.
But I selected the Sql Server Authentication, I cannot connect it.

Do you know, Why??

Also trying to connect from my webproject, I got the similar error.

:: connection string is below.

<connectionStrings>
        <add name="Conn" connectionString="Data Source=(local)\SQLExpress;Initial Catalog=WebShop;User ID=sa;Password=sa784512sa" providerName="System.Data.SqlClient"/>
  </connectionStrings>