ASP.Net
Application State
ASP.Net Application state is a
server side state management technique.Application state is a global storage
mechanism that used to stored data on the server and shared for all users,
means data stored in Application state is common for all user. Data from
Application state can be accessible anywhere in the application. Application state
is based on the System.Web.HttpApplicationState class.
Syntax of Application State
Create application state
·
Application[“varible”] = control;
Retrieve information from
application state
·
Control = Application[“varible”].ToString();
Example of Application State in ASP.Net
Generally
we use application state for calculate how many times a given page has been
visited by various clients.
Coading for
button_click event
protected void button_Click(object sender, EventArgs e)
{
int count = 0;
if (Application["Visit"] != null)
{
count = int.Parse(Application["Visit"].ToString());
}
count = count + 1;
Application["Visit"] = count;
Label1.Text = "Total Visit = " + count.ToString();
}
Run Program
1.
Run program
2.
Copy URL
3.
Past URL to new
tab on browser
Result
Label show number of count
to visit user
ViewState Example in
ASP.Net
ViewState
is a important client side state management technique. ViewState is used to
store user data on page at the time of post back of web page.
ViewState
does not hold the controls, it holds the values of controls. It does not
restore the value to control after page post back. ViewState can hold the value
on single web page, if we go to other page using response.redirect then
ViewState will be null.
·
ViewState stores data on
single page
·
ViewState is client side
state management technique
·
Session stores data on
whole website pages
·
Session is a server side
state management technique
Viewstate Example
Store the value in viewstate
ViewState[“varible”]=control;
Retrieve information from viewstate
control=ViewState[“varible”].ToString();
C# Code for above example
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnclear_Click(object sender, EventArgs e)
{
ViewState["name"] = TextBox1.Text;
TextBox1.Text = "";
}
protected void btndisplay_Click(object sender, EventArgs e)
{
Label1.Text = ViewState["name"].ToString();
}
Run Program
1. First write any data in textbox
2.
After that click clear
value button
3.
After that click display value button
ASP.Net Cookie Example
Cookies
is a small pieces of text information which is stored on user hard drive using
users browser for identify users. It may contain username, ID, password or any
information. Cookie does not use server memory.
How to create Cookies
Response.Cookies["varible"].Value = control;
How to expire
cookies
Response.Cookies["varible"].Expires= DateTime.Now.AddMinutes(1);
C# code for Cookie Example
Create
Cookie Button C# Code
protected void btncreate_Click(object sender, EventArgs e)
{
Response.Cookies["name"].Value = Textbox1.Text;
Response.Cookies["name"].Expires = DateTime.Now.AddMinutes(1);
Label1.Text = "Cookie Created";
Textbox1.Text = "";
}
Retrieve Cookie Button
Code
protected void btnretrieve_Click(object sender, EventArgs e)
{
if (Request.Cookies["name"] == null)
{
Textbox2.Text = "No cookie found";
}
else
{
Textbox2.Text = Request.Cookies["name"].Value;
}
}
