Dataset declaration question

Hi,

   I have a question about a control in a project I am working on, control is used as below to get data from a grid

this.propertyTableAdapter.UpdatepROTOTYP_DBDataSet.Property);Is this

just a dataset or is it something different. It shows all the names tables from the db and it has a .properties extension. I created a dataset and tried to have the grid update it the same way but I am told my dataset does not have a .property? This is how I defined my dataset

private DataSet dsProperty;

I have not seen the word dataset in a definition before...

Any idea's

Thanks,

George