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How to use Session variables?

by: Itfunda Product Type: Tips and Tricks (Books) Technologies: ASP.NET  Session-Management 

Session data is a user specific data stored into the server memory. By default when we store the data into the session, it is stored into the Web server memory and that is called In-Proc session. To store data into session and retrieve data from session, we can follow this approach.

    <asp:Label ID="lblMessage" runat="server" EnableViewState="false" />
        <asp:DetailsView ID="DetailsView1" runat="server" EnableViewState="false" />
    <p><asp:Button ID="btnClear" runat="server" Text="Clear Session" OnClick="ClearSession" /></p>
Code Behind
protected void Page_Load(object sender, EventArgs e)
    if (!IsPostBack)

private void GetData(int autoId)
    DataTable table = new DataTable();

    if (Session["MyData"] != null)
        table = (DataTable)Session["MyData"];
        lblMessage.Text = "Getting from Session";
        // get the connection
        using (SqlConnection conn = new SqlConnection(_connStr))
            // write the sql statement to execute
            string sql = "SELECT AutoId, FirstName, LastName, Age, Active FROM PersonalDetail WHERE AutoId = @AutoId ORDER By AutoId";
            // instantiate the command object to fire
            using (SqlCommand cmd = new SqlCommand(sql, conn))
                // get the adapter object and attach the command object to it
                using (SqlDataAdapter ad = new SqlDataAdapter(cmd))
                    SqlParameter prm = new SqlParameter("@AutoId", SqlDbType.Int);
                    prm.Value = autoId;
                    // fire Fill method to fetch the data and fill into DataTable
        Session["MyData"] = table;
        // set the time out to 40 minutes after that this session variable should expire
        Session.Timeout = 40;
        lblMessage.Text = "Getting from Database";
    // specify the data source for the GridView
    DetailsView1.DataSource = table;
    // bind the data now

protected void ClearSession(object sender, EventArgs e)
    // to cancel all the current sessionn for this user call
In the above code snippet, on the .aspx page we have an asp:Label, asp:DetailsView and an asp:Button. In the Page_Load we are calling GetData method to check if there is some data into the Session variable Session[“MyData”], if not we are using ADO.NET to retrieve the data and saving into the Session[“MyData”] session variableand specifying Session.Timeout to 40 (this will expire this session variable after 40 minutes and its data will be lost). If Session[“MyData”] is not null we are unboxing the session variable to the table variable of DataTable type and the same table is being used to populate the DetailsView.

On the click of “Clear Session” button; we are removing the “MyData” session key from the session that will remove the data “MyData” key value from the session object (If we will use Session[“MyData”] in the code behind now we shall get null value) . If we want to cancel all session of that particular user, we can call Session.Abandon method.


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.NET How to Tips and Tricks (700+)

.NET How to Tips and Tricks (700+) This ".NET How to Tips and Tricks" contains solutions of hundreds of technical problems related with ASP.NET, ASP.NET MVC, SQL Serer, jQuery etc. that help you to develop real time .NET projects easily. It has following features
  • Video tutorials
  • Demo projects source code
  • eBook with to-the point explanations & output
prepared by Sheo Narayan (Ex Microsoft MVP).

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