Question : Question regarding a dataset

I need to obtain the values from a dataset for latitude and longitude.
I just need refresh on doing so.

personal.Longitude = float.Parse(City.GetCitys(ddlCountryRegister.SelectedValue, ddlRegion.SelectedValue, "omegaloveConnectionString").Tables[0].Columns["Latititude"].ToString());
                        personal.Longitude = float.Parse(City.GetCitys(ddlCountryRegister.SelectedValue, ddlRegion.SelectedValue, "omegaloveConnectionString").Tables[0].Columns["Longitude"].ToString());
                     

 public static DataSet GetCitys(string countryid, string regionid, string connectionString)
        {
            try
            {
                DBAccess db = new DBAccess(connectionString);
                db.AddParameter("@sCountryID", countryid);
                db.AddParameter("@sRegionID", regionid);
                return db.ExecuteDataSet("prcCitys_SelectForCountryRegion");

            }
            catch
            {
               
            }
            return null;
               
           
        }

Error      5      Cannot implicitly convert type 'float' to 'string'      C:\inetpub\wwwroot\OmegaLove.Web\OmegaLove.Web\Controls\ctrlRegisterForm.ascx.cs      170      46      OmegaLove.Web

Answer : Question regarding a dataset

personal.Longitude = City.GetCitys(ddlCountryRegister.SelectedValue, ddlRegion.SelectedValue, "omegaloveConnectionString").Tables[0].Columns["Latititude"].ToString();
                        personal.Longitude =City.GetCitys(ddlCountryRegister.SelectedValue, ddlRegion.SelectedValue, "omegaloveConnectionString").Tables[0].Columns["Longitude"].ToString();