how i can convert data reader to the data set

public DataSet GetData( )
        {
DataSet ds = new DataSet();
            SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Mob"].ConnectionString);
            SqlCommand cmd = new SqlCommand("GetData", con);
            DataSet ds = new DataSet();
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Connection = con;

            con.Open();
SqlDataAdapter da = new SqlDataAdapter(cmd); //You don't need a DataReader, fill the dataset instead.
da.Fill(ds);   
            con.Close();
       return ds;
    }

public void GetData( )
{
    DataSet ds = new DataSet();
    SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Mob"].ConnectionString);
    con.Open();
    SqlCommand cmd = new SqlCommand("GetData", con);
    cmd.CommandType = CommandType.StoredProcedure;
    SqlDataAdapter da = new SqlDataAdapte(cmd); 
    //Filling the records in dataset
    da.Fill(ds); 
    con.Close();       
}