Angelina Angelina - 2 months ago 18
ASP.NET (C#) Question

An object reference is required for the non-static field, method, or property 'System.Web.UI.Page.Session.get'

I'm getting error like


An object reference is required for the non-static field, method, or
property 'System.Web.UI.Page.Session.get'


Can you suggest me to recover from this problem in session.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Services;
using System.Configuration;
using System.Data.SqlClient;
using System.Web.SessionState;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
//Onclick Submit Button
[WebMethod(EnableSession = true)]
//[System.Web.Services.WebMethod(EnableSession = true)]
public static string Login(string email, string password)
{
var con = new SqlConnection(ConfigurationManager.ConnectionStrings["blogConnString"].ConnectionString);
con.Open();
string res = "0";
SqlDataReader reader;
string sql = "select uid,username from personal where email='" + email + "' and password='" + password + "'";
SqlCommand cmd1 = new SqlCommand(sql, con);
reader = cmd1.ExecuteReader();
while (reader.Read())
{
res = "1";
Session["UID"] = reader["uid"].ToString(); //error line here
Session["UNAME"] = reader["username"].ToString(); //error line here
}
return res;
con.Close();
}
}

Answer

Try this code and please be-ware of SQL Injection - to prevent it, use a Parametrized Query as follows:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Services;
using System.Configuration;
using System.Data.SqlClient;
using System.Web.SessionState;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    //Onclick Submit Button
    [WebMethod(EnableSession = true)]
    //[System.Web.Services.WebMethod(EnableSession = true)]
    public static string Login(string email, string password)
    {
        var con = ConfigurationManager.ConnectionStrings["blogConnString"].ConnectionString;
        con.Open();
        string res = "0";
        SqlDataReader reader;       
        string sql = "select uid,username from personal where email=@Email and password=@Password";
        using(SqlConnection connection = new SqlConnection(con))
        {
            SqlCommand command = new SqlCommand(commandText, connection);
            command.Parameters.Add("@Email", SqlDbType.String);
            command.Parameters["@Email"].Value = email;

            command.Parameters.AddWithValue("@Password", password);       
            reader = command.ExecuteReader();
            while (reader.Read())
            {
               res = "1";
               HttpContext.Current.Session["UID"] = reader["uid"].ToString();           //Either Remove Static from Method Declaration or use HttpContext.Current along with session.
               HttpContext.Current.Session["UNAME"] = reader["username"].ToString();
            }
        }
        return res;
        con.Close();
    }
}