Error: Invalid column "emailyahoo.com" or Error:The multi-part identifier "email@yahoo.com" could not be bound

i am getting this error,
Error:The multi-part identifier "email@yahoo.com" could not be bound
by using the code below , so i ommited @ from my email during login , to check whether an error is due to @  but after ommitting @ , I am getting this error,
Error: Invalid column "emailyahoo.com"
CODE:
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;

public partial class advertisementSubmission : System.Web.UI.Page
{
    protected String EmplyrSession;

    protected void Page_Load(object sender, ...