Report preview not showing the table data

hi,I.m trying to create a Report for My application . i'm using telerik Reporting R2 2016.

Actually i add the New item telerik reporting R2 2016(blank) in  my  project . After i create an object data source and i choose the data Source member as a class Constructor. And i add a Table Wizard in detail section (report) and i Choose the Field also . The probelm is preview of report is not showing the table ( i mean it 's empty ) .Why ???