Using block around a static/singleton resource reference
- by byte
This is interesting (to me anyway), and I'd like to see if anyone has a good answer and explanation for this behavior.
Say you have a singleton database object (or static database object), and you have it stored in a class Foo.
public class Foo
{
public static SqlConnection DBConn = new SqlConnection(ConfigurationManager.ConnectionStrings["BAR"].ConnectionString);
}
Then, lets say that you are cognizant of the usefulness of calling and disposing your connection (pretend for this example that its a one-time use for purposes of illustration). So you decide to use a 'using' block to take care of the Dispose() call.
using (SqlConnection conn = Foo.DBConn)
{
conn.Open();
using (SqlCommand cmd = new SqlCommand())
{
cmd.Connection = conn;
cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.CommandText = "SP_YOUR_PROC";
cmd.ExecuteNonQuery();
}
conn.Close();
}
This fails, with an error stating that the "ConnectionString property is not initialized". It's not an issue with pulling the connection string from the app.config/web.config. When you investigate in a debug session you see that Foo.DBConn is not null, but contains empty properties.
Why is this?
