Q:

What is a Session State in ASP.NET?

YasminRadwan26
Save to bookmark
|
2022-05-23
|
  209 
0

In this Code Snippet, you'll learn how to store and retrieve session values in C# and VB.NET.

Asp.net, examples, Asp.net examples,
login and add your own answer to this question

All Answers

YasminRadwan26
2022-05-23
need an explanation for this answer? contact us directly to get an explanation for this answer

 Session State is utilized to store the values of a client's browser session. A browser session is the duration of a user's website visit. Once the browser is closed, the session is finished. If the same user comes back to the website, a new session will be created. The session enables the data to be put away in one page and accessed on another page and supports any kind of item. In numerous sites, we can see its usefulness. For example - Once we are logged into a site, the site demonstrates our username (logged in user info) on every page. This happens because the site stores the username in a session.
 
When a client visits a web page, a new session is created with a unique session ID. The session ID is deleted once the user closes the current browser instance. 
 
Let's test this.
Create an ASP.NET website using Visual Studio.
Open Default.aspx page and replace the current page content with the following code.
 
Defaulf.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>  
      <h3>SessionStateData.aspx</h3>  
   <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> ​

Now, add the following namespaces in your code-behind.

C# code:

using System;  
After that write the following code in button click  
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");  
}

VB.NET Code

Partial Class SessionStateExample  
Inherits System.Web.UI.Page  
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)  
End Sub  
' Set Session values during button click  
Protected Sub btnSubmit_Click(ByVal sender As Object, ByVal e As EventArgs)  
Session("FirstName") = txtfName.Text  
Session("LastName") = txtlName.Text  
Response.Redirect("Default2.aspx")  
End Sub  
End Class
In the above code, what we're doing is storing the first name and last name in two Session variables. Once this data is stored, it will be available to the application during that session on every page. 
 
Now, right-click on your website in Visual Studio Solution Explorer > select Add new item > select Web Form > give name as Default2.aspx.
 
Open the Default2.aspx page and write the following code.
 
Default2.aspx
<html xmlns="http://www.w3.org/1999/xhtml">  
<head runat="server">  
   <title>Untitled Page</title>  
</head>  
<body>  
   <form id="form1" runat="server">  
      <div>  
         <h3>Default2.aspx</h3>  
            <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>

Now, add the following namespaces in your code-behind.

C# Code

  using System;

After that, write the following code on the button click event handler. As you can see from this code, we're reading back the session variables we stored data on the previous page. We're also displaying the first name and the last name read from the session variables in a label.

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

VB.NET Code

Partial Class Default2  
Inherits System.Web.UI.Page  
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load  
If Not IsPostBack Then  
If Session("FirstName") Is Nothing AndAlso Session("LastName") Is Nothing Then  
Session("FirstName") = "Sarthak"  
Session("LastName") = " Varshney"  
lblString.Text = "Welcome " & Convert.ToString(Session("FirstName")) & Convert.ToString(Session("LastName"))  
Else  
lblString.Text = Convert.ToString(Session("FirstName")) & " " & Convert.ToString(Session("LastName"))  
lblfName.Text = Session("FirstName").ToString()  
lbllName.Text = Session("LastName").ToString()  
End If  
End If  
End Sub  
End Class

need an explanation for this answer? contact us directly to get an explanation for this answer

total answers (1)

Similar questions

need a help?

find thousands of online teachers now