Question

I am currently trying to establish a connection between an ASP.NET web site project and a Database built by SQL Server 2008 R2.

The way I am required to do so is to use the connectionString from the Web.config page, but I have no idea what value to give it or how to establish a connection using said value. (Using C#)

Any help would be appreciated, as I found next to no information about the subject.

Here is the (default) value that is currently in the Web.config page:

<connectionStrings>
    <add name="ApplicationServices" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnetdb.mdf;User Instance=true" providerName="System.Data.SqlClient"/>
</connectionStrings>

Answer 1

Use Configuration Manager:

using System.Data.SqlClient;
using System.Configuration;

string connectionString = ConfigurationManager.ConnectionStrings["ApplicationServices"].ConnectionString;

using(SqlConnection SqlConnection = new SqlConnection(connectionString));

//The rest is here to show you how this connection would be used. But the code above this comment is all you really asked for, which is how to connect.

{

   SqlDataAdapter SqlDataAdapter = new SqlDataAdapter();
   SqlCommand SqlCommand = new SqlCommand();

   SqlConnection.Open();
   SqlCommand.CommandText = "select * from table";
   SqlCommand.Connection = SqlConnection;
   SqlDataReader dr = SqlCommand.ExecuteReader(CommandBehavior.CloseConnection);

}