I have a web app in C# that has always worked, but now when I run it I get an error on this line:
using (SqlConnection gdbConnection = new SqlConnection(ConfigurationManager.ConnectionStrings[connectionStringName].ConnectionString))
It says that the "ConfigurationMangager" object doesn't exist. I thought that class was part of the framework, but it's acting like I need to instantiate it myself. What am I missing?