How to update user data in mysql using ASP.NET

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ASP.NET

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Configuration;
using MySql.Data.MySqlClient;


public partial class profile : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Label1.Text = Session["user"].ToString();
    }

    protected void Button2_Click(object sender, EventArgs e)
    {
        MySqlConnection con = new MySqlConnection();
        string str = ConfigurationManager.ConnectionStrings["netConnectionString"].ConnectionString;
        con.ConnectionString = str;
        con.Open();

        if (con.State.ToString() == "Open")
        {
            MySqlCommand cmd = new MySqlCommand("update users Set education=@c,about=@d,interest=@e where user_name="Session["user"].ToString"",con);
            cmd.Parameters.AddWithValue("@c", TextBox1.Text);
            cmd.Parameters.AddWithValue("@d", TextBox2.Text);
            cmd.Parameters.AddWithValue("@e", TextBox3.Text);
            cmd.ExecuteNonQuery();
            Label5.Text = "Well done profile updated!!";
        }
    }
}

I want to update user information from its profile i am getting error at this (where user_name="Session["user"].ToString") see above code please help me