web service page System.IndexOutOfRangeException - asp.net

Question

public class GetAreaFromCity : System.Web.Services.WebService
{
[WebMethod]
public GetAreaByCityId ClassForGetCIty(int City_Id)
{
string CS =ConfigurationManager.ConnectionStrings["FOODINNConnectionString"].ConnectionString;
using (SqlConnection con = new SqlConnection(CS))
{
SqlCommand cmd = new SqlCommand("spGetCityById",con);
cmd.CommandType = CommandType.StoredProcedure;
SqlParameter parameter = new SqlParameter("#ID", City_Id);
//To assiate this parameter object with cmd object
cmd.Parameters.Add(parameter);
GetAreaByCityId GETAreaByCityId =new GetAreaByCityId();
con.Open();
SqlDataReader reader = cmd.ExecuteReader();
//as WeakReference read data wewant ToString retrive Column value & then polute this property City_Id values
while (reader.Read()){
GETAreaByCityId.City_Id = Convert.ToInt32(reader["City_Id"]);
GETAreaByCityId.Area_Id = Convert.ToInt32(reader["Area_Id"]);
}
return GETAreaByCityId;
//ToString return sql
}
}
}
that's my codes for service page
public class GetAreaByCityId
{
public int Ca_Id {get;set; }
public int City_Id { get; set; }
public int Area_Id { get; set; }
}
that's the class for getting the Area by city
Create Proc [dbo].[spGetCityById]
#ID int
as
Begin
Select Area_Id from
CITIES_AREA where City_Id = #ID
End
GO
and above the database procedure which is data can be retrieve
System.IndexOutOfRangeException: City_Id
at System.Data.ProviderBase.FieldNameLookup.GetOrdinal(String fieldName)
at System.Data.SqlClient.SqlDataReader.GetOrdinal(String name)
at System.Data.SqlClient.SqlDataReader.get_Item(String name)
at WebApplication1.GetAreaFromCity.ClassForGetCIty(Int32 City_Id) in c:\Users\Mudassir\Documents\Visual Studio 2013\Projects\WebApplication1\WebAppli
the above error i dont know whats the problem

Answer 1

Your stored procedure is returning only Area_Id. Your code in the "while loop" while (reader.Read()){ is attempting to read data from two columns:
City_Id
Area_Id
You could add the column City_Id to the result set for your stored procedure query, BUT you already have that value because you are passing it to the stored procedure as a parameter.
Easiest fix is probably to just change this line:
GETAreaByCityId.City_Id = Convert.ToInt32(reader["City_Id"]);
to this:
GETAreaByCityId.City_Id = City_Id;