Exemplo de sessão no ASP.NET

agosto 21st, 2014 by franklin Leave a reply »

Crie os respectivos arquivos index.aspx.cs e index.aspx
Abaixo o index.aspx.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
 
public partial class index : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }
 
    protected void btnCreateSession_Click(object sender, EventArgs e)
    {
        Session["Username"] = txtUserName.Text.Trim();
    }
 
    protected void btnRetrieveSession_Click(object sender, EventArgs e)
    {
        DisplaySessionValue();
    }
 
    protected void btnRemoveSession_Click(object sender, EventArgs e)
    {
        Session.Remove("Username");
 
        DisplaySessionValue();
    }
 
    protected void btnRemoveAll_Click(object sender, EventArgs e)
    {
        Session.RemoveAll();
 
        DisplaySessionValue();
    }
 
    private void DisplaySessionValue()
    {
        if (Session["Username"] != null)
            lblSessionValue.Text = Convert.ToString(Session["Username"]);
        else
            lblSessionValue.Text = "No Value has been stored in session";
    }
}

Abaixo o index.aspx

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="index.aspx.cs" Inherits="index" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>ASP.net How to use session</title>
    <style type="text/css">
     .txtInput
     {
         width:250px; height:28px; paddiang:3px;
     }   
     div
     {
         margin:5px;
     }
     .validator
     {
         color:Red;
     }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>
         <fieldset>
            <h3>How to use Session</h3>
            <div>
            Userame:<br />
            <asp:TextBox ID="txtUserName" runat="server" MaxLength="50"></asp:TextBox>
            <asp:RequiredFieldValidator ID="rfvFirstName" runat="server" Display="Dynamic"
             CssClass="validator"  ControlToValidate="txtUserName"
             ErrorMessage="Username is required"></asp:RequiredFieldValidator>
            </div>
            <div>
                <asp:Button ID="btnCreateSession" runat="server" 
                    Text="Click to Create Session" onclick="btnCreateSession_Click" />
                &nbsp;
                <asp:Button ID="btnRetrieveSession" runat="server" CausesValidation="false" 
                    Text="Click to Retrieve Session Value" onclick="btnRetrieveSession_Click" />
                &nbsp;
                <asp:Button ID="btnRemoveSession" runat="server" CausesValidation="false" 
                    Text="Click to Remove Session Value" onclick="btnRemoveSession_Click" />
                &nbsp;
                <asp:Button ID="btnRemoveAll" runat="server" CausesValidation="false" 
                    Text="Click to Remove All Sessions" onclick="btnRemoveAll_Click" />
            </div>
            <p>
                Note: 1st create a session by providing user name in text field, then you can retrieve the value from session.
            </p>
            <div>
                Value stored in Session: 
                <strong><asp:Label ID="lblSessionValue" runat="server"></asp:Label></strong>
            </div>
        </fieldset>
    </div>
    </form>
</body>
</html>

Posted in asp.net, iis, Windows

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