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How to: Save and Retrive Values in Session Asp.net(C#).

What is SessionState?

The session state is used to maintain the session of each user throughout the application. Session allows information to be stored in one page and access in another page and support any type of object. In many websites we will see the functionality like once if we login into website they will show username in all the pages for that they will store username in session and they will access that session username in all the pages.

Whenever user enters into website new session id will generate for that user. This session Id will delete when he leave from that application. If he enters again he will get new session Id.

Default.aspx
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>Asp.net Session State Example in C#, VB.NET</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <table>
            <tr>
                <td>
                    FirstName:
                </td>
                <td>
                    <asp:TextBox ID="txtfName" runat="server" />
                </td>
            </tr>
            <tr>
                <td>
                    LastName:
                </td>
                <td>
                    <asp:TextBox ID="txtlName" runat="server" />
                </td>
            </tr>
            <tr>
                <td>
                </td>
                <td>
                    <asp:Button ID="btnSubmit" runat="server" Text="Set SessionState Data" OnClick="btnSubmit_Click" />
                </td>
            </tr>
        </table>
    </div>
    </form>
</body>

</html>

Default.aspx.cs

 protected void Page_Load(object sender, EventArgs e)
        {

        }
        // Set Session values during button click
        protected void btnSubmit_Click(object sender, EventArgs e)
        {
            Session["FirstName"] = txtfName.Text;
            Session["LastName"] = txtlName.Text;
            Response.Redirect("Default2.aspx");
        }

Default1.aspx

 <html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <table>
            <tr>
                <td colspan="2">
                    Welcome <b>
                        <asp:Label ID="lblString" runat="server" /></b>
                </td>
            </tr>
            <tr>
                <td>
                    Your FirstName:
                </td>
                <td>
                    <b>
                        <asp:Label ID="lblfName" runat="server" /></b>
                </td>
            </tr>
            <tr>
                <td>
                    Your LastName
                </td>
                <td>
                    <b>
                        <asp:Label ID="lbllName" runat="server" /></b>
                </td>
            </tr>
            <tr>
                <td>
                </td>
                <td>
                </td>
            </tr>
        </table>
    </div>
    </form>
</body>

</html>

Default1.aspx.cs

   protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                if (Session["FirstName"] == null && Session["LastName"] == null)
                {
                    Session["FirstName"] = "Nikhil";
                    Session["LastName"] = "  Sangani";
                    lblString.Text = "Welcome " + Session["FirstName"] + Session["LastName"];
                }
                else
                {
                    lblString.Text = Session["FirstName"] + " " + Session["LastName"];
                    lblfName.Text = Session["FirstName"].ToString();
                    lbllName.Text = Session["LastName"].ToString();
                }
            }

        }

Now run Default.aspx to create session.




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