How to login using more then one string in Asp.net..?

   string email = "value1 & value2";
    string password = "pass & pass1";
    if (TextBox1.Text == email & TextBox2.Text == password)
    {
        Session["id"] = TextBox1.Text;
        Response.Redirect("Dashboard.aspx");
        Session.RemoveAll(); 
    }
    else
    {
        ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertMessage", "alert('Sorry !! Email Id Or Password wrong ')", true);
    }

how to perform or operation in string email and password