Please try in that way:-
In first class:-
public string _chartName;
In Second Class:-
    internal class DefaultAllReadingsDataProvider : DataProvider
         {
            internal override OutputData GetOutputData(Guid userId, int N, int pageNum)
            {
               IntelliChart iclass = new IntelliChart("test");
               Response.Write(iclass._chartName);
            }
         }
0
solved how to get parameter in other class