Question

In VB.NET I can use:

Protected Conn As New SqlConnection(ConfigurationManager.ConnectionStrings("Active").ConnectionString)

However, when I do the following in C#:

protected SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings("conn"));

I get the error:

The name ‘ConfigurationManager’ does not exist in the current context

Then if I change it to:

protected SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings("conn"));

I get the error:

Non-invocable member
‘System.Configuration.ConfigurationManager.ConnectionStrings’ cannot
be used like a method.

Why is this and how can I connect to my SQL Server database using C#?

Answer 1

Try like this:

protected SqlConnection conn = new SqlConnection(
    ConfigurationManager.ConnectionStrings["conn"].ConnectionString
);

Notice the [] instead of () which is what is used to access an element of an array in C#. Also notice the usage of the .ConnectionString property call as the SqlConnection constructor expects a string.