how to use the following class for the insertion,data retrieve from the database in c#

public DataSet GetData(string Query)
        {
            try
            {
                if (ds.Tables.Count > 0)
                {
                    ds.Tables.Clear();
                }
                SqlDataAdapter adp = new SqlDataAdapter(Query, con);
                adp.Fill(ds, "s");
                return ds;
            }
            catch (Exception) 
            {
                throw;
                return ds; 
            }

        }