Question

Best way to manage user requests for reading too many rows from a table in database by using a WCF service call

I mean what is performance tips what is the best way?

Answer 1

I would implement paging via the service and pull the data across the wire page by page as required.

A pointer in the right direction:

//service interface
[ServiceContract]
public interface IService1
{
    [OperationContract]
    List<string> DoWork(int page, int pageSize, out int totalRecords);
}

//service implementation
public class Service1 : IService1
{
    public List<string> DoWork(int page, int pageSize, out int totalRecords)
    {
        var l = new List<string>();
        totalRecords = l.Count();
        return l.Skip((page - 1) * pageSize).Take(pageSize).ToList();
    }
}