I am new with the subsonic, and I have a problem when trying to update the database from the sql server. I have created a gridview by still is not returning the updates results. can you please help me? its getting an error code on dc.AddMostaHse(); (Cannot implicity convert type 'void to 'object')

Here is the code being done of DataAccess.cs page

public void AddMostaHse() {

        Mosta.MostaHSE1 xx = new MostaHSE1();
        xx.ID = 94;
        xx.FunctionLocation = "lza94";
        xx.acno = 12;
        xx.Save();
    }

Binding it with the gridview. {

        DataAccess dc = new DataAccess();
        gvtest.DataSource = dc.AddMostaHse();
        gvtest.DataBind();

    }