How to allow remote connection when uploading to host?

using System;
using System.Web;
using System.Web.Profile;



public class ProfileCommon : System.Web.Profile.ProfileBase {
    
    public virtual ShoppingCartExample.Cart SCart {
        get {
            return ((ShoppingCartExample.Cart)(this.GetPropertyValue("SCart"))); //<-- I GET AN ERROR HERE//
        }
        set {
            this.SetPropertyValue("SCart", value);
        }
    }
    
    public virtual ProfileCommon GetProfile(string username) {
        return ((ProfileCommon)(ProfileBase.Create(username)));
    }
}

A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)