In the ChatProvider implementation code ,

You can override the method and use another way to return the connection string :

for example:

 

public class ExampleProvider : ChatProvider
{

 

public override string GetConnectionString()
 {

  //return base.GetConnectionString();//the default implementation is "ConnectionString"

 

  //now use another way to return the string :
  return System.Configuration.ConfigurationSettings.AppSettings["AnotherConnectionString"];

 }

 

....

 

}