We know HTTP is stateless protocol; this protocol cannot store user information on page because Web server treats each HTTP request for a page as an independent request. The server retains no knowledge of variable values. ASP.NET Session state enables you to store and retrieve values for a user when user navigates other ASP.NET pages in a Web application. A session is defined as the period of time that a unique user interacts with a Web application. Session provides us facility to store information on server side. Session data is stored as per user basis.
Some Session methods are:
· Session.Abandon() - Removes the Session and all items that it contains
· Session.RemoveAll() - Removes all items from the Session
· Session.Remove ("SessionName") - Removes the item that stored under the name "SelectedName".
· Session.Clear() - Removes items from the Session
In this example I will show you that how to use session variable to store user information as well as we can show that how to retrieve values from session variable.
<form id="form1" runat="server">
<table border="1" style="width: 300px; height: 200px; left: 450px; top: 250px; position: absolute">
<tr>
<td>
<table style="width: 300px; height: 200px; " cellpadding="2">
<tr>
<td colspan="2" align="center">
<asp:Label ID="UserDetail" runat="server" Text="Enter Inforamtion"
Font-Bold="True"></asp:Label>
</td>
</tr>
<tr>
<td align="center">
<asp:Label ID="Name" runat="server" Text="Name"> </asp:Label>
</td>
<td align="center">
<asp:TextBox ID="NameTextbox" runat="server" Width="105px"></asp:TextBox>
</td>
</tr>
<tr>
<td align="center">
<asp:Label ID="City" runat="server" Text="City"> </asp:Label>
</td>
<td align="center">
<asp:TextBox ID="CityTextBox" runat="server" Width="105px"></asp:TextBox>
</td>
</tr>
<tr>
<td align="center">
<asp:Label ID="Age" runat="server" Text="Age"> </asp:Label>
</td>
<td align="center">
<asp:TextBox ID="AgeTextBox" runat="server" Width="105px"></asp:TextBox>
</td>
</tr>
<tr>
<td align="center">
<asp:Label ID="State" runat="server" Text="State"> </asp:Label>
</td>
<td align="center">
<asp:DropDownList ID="DropDownList1" runat="server" Width="105px">
</asp:DropDownList>
</td>
</tr>
<tr>
<td align="right" colspan="2">
<asp:Button ID="Submit" runat="server" Text="Submit" onclick="Submit_Click" />
</td>
</tr>
</table>
</td>
</tr>
</table>
</form>
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
string[] state = { "U.P.", "Delhi", "Chennai", "Kolkata" };//creating string array to store state name
for (int c = 0; c < state.Length; c++)//executing loop
{
DropDownList1.Items.Add(state[c]);//state name adding in dropdownlist
}
}
}
protected void Submit_Click(object sender, EventArgs e)
{
Session["Name"] = NameTextbox.Text;//value storing in session variable
Session["City"] = CityTextBox.Text;
Session["Age"] = AgeTextBox.Text;
Session["State"] = DropDownList1.Text;
Response.Redirect("Userinforamtiom.aspx");
}
}
<form id="form1" runat="server">
<table border="1" style="width: 300px; height: 200px; left: 450px; top: 250px; position: absolute">
<tr>
<td>
<table style="width: 300px; height: 200px; " cellpadding="2">
<tr>
<td colspan="2" align="center">
<asp:Label ID="UserDetail" runat="server" Text="User Detail" Font-Bold="True"></asp:Label>
</td>
</tr>
<tr>
<td align="center">
<asp:Label ID="Name" runat="server" Text="Name"> </asp:Label>
</td>
<td align="center">
<asp:Label ID="UserName" runat="server" ></asp:Label>
</td>
</tr>
<tr>
<td align="center">
<asp:Label ID="City" runat="server" Text="City"> </asp:Label>
</td>
<td align="center">
<asp:Label ID="UserCity" runat="server" ></asp:Label>
</td>
</tr>
<tr>
<td align="center">
<asp:Label ID="Age" runat="server" Text="Age"> </asp:Label>
</td>
<td align="center">
<asp:Label ID="UserAge" runat="server" ></asp:Label>
</td>
</tr>
<tr>
<td align="center">
<asp:Label ID="State" runat="server" Text="State"> </asp:Label>
</td>
<td align="center">
<asp:Label ID="UserState" runat="server" ></asp:Label>
</td>
</tr>
</table>
</td>
</tr>
</table>
</form>
public partial class Userinforamtiom : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
UserName.Text = Session["Name"].ToString();//retrieving value from session variable
UserCity.Text = Session["City"].ToString();
UserAge.Text = Session["Age"].ToString();
UserState.Text = Session["State"].ToString();
}
}
In this page user details will be shown by session variable.
