i am trying to call a function that is defined in a class RFIDeas_Wrapper(dll being used). But when i checked for type of reader and after that i used it to call function it shows me error Cannot convert type T to RFIDeas_Wrapper.

EDIT

private List<string> GetTagCollection<T>(T Reader)
            {
                TagCollection = new List<string>();
                if (Reader.GetType() == typeof(RFIDeas_Wrapper))
                {

                    ((RFIDeas_Wrapper)Reader).OpenDevice(); 
                    // here Reader  is of type RFIDeas_Wrapper
                    //, but i m not able to convert Reader into its datatype.

                    string Tag_Id =  ((RFIDeas_Wrapper)Reader).TagID();
                    //Adds Valid Tag Ids into the collection
                    if(Tag_Id!="0")
                        TagCollection.Add(Tag_Id);
                }
                else if (Reader.GetType() == typeof(AlienReader))
                    TagCollection = ((AlienReader)Reader).TagCollection;

                return TagCollection;
            }

((RFIDeas_Wrapper)Reader).OpenDevice(); , ((AlienReader)Reader).TagCollection; I want this line to be executed without any issue. As Reader will always be of the type i m specifying. How to make compiler understand the same thing.