c# Override Property with different compatible Type

I need a base class with a property where I can derive classes with the same property but different (compatible) types and use operation get and set from base class.

public abstract class Plugin<T> 

{

        private T _pluginConfiguration;

        public virtual T PluginConfiguration

        {

            get

            {

                // some operation

                return _pluginConfiguration;

            }

            set

            {

                // some operation  

                _pluginConfiguration = value;

            }

        }

}

-------------------

public class FilePlugin : Plugin<FileConfiguration>

{

        PluginConfiguration = new FileConfiguration(); // execute abstract class setter

       

        PluginConfiguration.ServerName= "TestServer";  // execute abstract class getter

}

------------------

Resources:
http://stackoverflow.com/questions/1048884/c-overriding-return-types
http://stackoverflow.com/questions/3141325/override-property-with-different-compatible-type
http://stackoverflow.com/questions/6351025/overriding-an-abstract-property-with-a-derived-return-type-in-c-sharp
http://stackoverflow.com/questions/3551012/override-a-property-with-a-derived-type-and-same-name-c-sharp
http://stackoverflow.com/questions/8108012/c-properties-with-different-return-types-on-derived-classes
http://stackoverflow.com/questions/157119/c-sharp-can-i-override-with-derived-types