<!-- Adds OutputCache directive -->
<%@ OutputCache Duration="23" VaryByParam="None" %> 

				
<!-- Sets client OutputCache -->
<%@ OutputCache Duration="23" VaryByParam="None" Location="Client" %>  

				
protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
        // Gets product id from table Production.Product.
        // Then binding data to drop down list control.
        InitControl(GetProductId());
    }
}
/// <summary>
/// Handles the Click event of the btnSubmit control.
/// Redirects to relative product information page.
/// </summary>
protected void btnSubmit_Click(object sender, EventArgs e)
{
    Response.Redirect(string.Format("Product.aspx?productname={0}", ddlProductName.SelectedValue));
}  

				
protected void Page_Load(object sender, EventArgs e)
{
    // Get product name.
    string productName = Request.QueryString["productname"];

    // Binding data to data grid view control.
    InitControl(this.GetData(productName));
}

/// <summary>
/// Inits the control.
/// </summary>
/// <param name="ds">The dataset.</param>
private void InitControl(DataSet ds)
{
    dgvProduct.DataSource = ds;
    dgvProduct.DataBind();
}

/// <summary>
/// Gets the data.
/// </summary>
/// <param name="productName">Name of the product.</param>
/// <returns>Returns dataset</returns>
private DataSet GetData(string productName)
{
    // The query sql base on product name.
    string sql = 
        string.Format(
        "SELECT Name, ProductNumber, SafetyStockLevel, ReorderPoint, StandardCost, DaysToManufacture "
        + "FROM Production.Product WHERE ProductNumber='{0}'",
        productName);

    // Get data from table Production.Product.
    using (var con = new SqlConnection(ConfigurationManager.ConnectionStrings["SQLCONN"].ToString()))
    using (var com = new SqlCommand(sql, con))
    {
        com.Connection.Open();
        ////gdvData.DataSource = com.ExecuteReader();
        ////gdvData.DataBind();
        var ada = new SqlDataAdapter(com);
        var ds = new DataSet();
        ada.Fill(ds);
        return ds;
    }
} 

				
<!-- Adds OutputCache directive -->
<%@ OutputCache Duration="30" VaryByParam="None" %> 

				
<!-- Sets VaryByParam property-->
<%@ OutputCache Duration="30" VaryByParam="productname" %> 

				
/// <summary>
/// Gets vary cache based on custom string value.
/// </summary>
/// <param name="context">Http context.</param>
/// <param name="custom">custom string</param>
/// <returns></returns>
public override string GetVaryByCustomString(HttpContext context, string custom)
{
    if (string.Equals(custom, "UserHostName", StringComparison.OrdinalIgnoreCase))
    {
        // Indicates that the cache should be vary on user host name.
        return Context.Request.UserHostName;
    }
    return base.GetVaryByCustomString(context, custom);
} 

				
<!-- set vary cache based on custom string value -->
<%@ OutputCache Duration="30" VaryByParam="None" VaryByCustom="UserHostName" %> 

				
<caching>
  <!-- Sets out put cache profile-->
  <outputCacheSettings>
    <outputCacheProfiles>
      <add name="ProductCacheProfile" duration="30"/>
    </outputCacheProfiles>
  </outputCacheSettings>
</caching> 

				
<!-- set CacheProfile property -->
<%@ OutputCache CacheProfile="ProductCacheProfile" VaryByParam="None" %>  

				
        <!-- The product number datasource START -->
        <asp:SqlDataSource ID="sourceProductName" runat="server" ProviderName="System.Data.SqlClient"
            EnableCaching="True" CacheDuration="3600" ConnectionString="<%$ ConnectionStrings:SQLCONN %>"
            SelectCommand="SELECT ProductNumber FROM Production.Product"></asp:SqlDataSource>
        <!-- The product number datasource END -->
        
        <!-- The product datasource START -->
        <asp:SqlDataSource ID="sourceProduct" runat="server" ProviderName="System.Data.SqlClient"
            EnableCaching="True" CacheDuration="3600" ConnectionString="<%$ ConnectionStrings:SQLCONN %>"
            SelectCommand="SELECT Name, ProductNumber, SafetyStockLevel, ReorderPoint, StandardCost, 
            DaysToManufacture FROM Production.Product WHERE ProductNumber=@ProductNumber">
            <SelectParameters>
                <asp:ControlParameter ControlID="ddlProductNumber" Name="ProductNumber" PropertyName=
                "SelectedValue" />
            </SelectParameters>
        </asp:SqlDataSource>
        <!-- The product number datasource END -->
        
        <!-- Binding the product number to gridview control -->
        <!-- NOTE: Due to search and result in the same page, so need to set AutoPostBack is True-->
        <asp:DropDownList ID="ddlProductNumber" AutoPostBack="True" DataSourceID="sourceProductName"
            DataTextField="ProductNumber" runat="server">
        </asp:DropDownList>
        
        <!-- Binding the product datasource to gridview control -->
        <asp:GridView ID="gvProduct" runat="server" DataSourceID="sourceProduct" CssClass="Product">
        </asp:GridView>  

				
// Creates cache object Key1.
Cache["Key1"] = "Cache Item 1";

// Makes Cache["Key2"] dependent on Cache["Key1"].
string[] dependencyKey = new string[1];
dependencyKey[0] = "Key1";

// Creates a CacheDependency object.
CacheDependency dependency = new CacheDependency(null, dependencyKey);

// Establishs dependency between cache Key1 and Key2.
Cache.Insert("Key2", "Cache Item 2", dependency);  

				
/// <summary>
/// Caches the data into text file.
/// </summary>
/// <param name="context">The http context</param>
private void CacheData(HttpContext context)
{
    // Weibo API.
    string uri = context.Request.QueryString["api"] + "?" +
        "source=" + context.Request.QueryString["source"] + "&" +
          "count=" + context.Request.QueryString["count"];
    
    HttpWebResponse response = this.GetWeibos(uri);

    if (null == response)
    {
        throw new ArgumentNullException("Response is null");
    }

    string jsonData;
    // Writes the reponse data into text file.
    using (var reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding
    (response.CharacterSet)))
    {
        jsonData = reader.ReadToEnd();
    }

    string dataPath = context.Server.MapPath("weibo.json");
    using (var writer = new StreamWriter(dataPath, false, Encoding.GetEncoding(response.CharacterSet)))
    {
        writer.Write(jsonData);
    }
    
    // Establishs dependency between cache weibo and text file.
    // Sets cache expires after 2 minuntes.
    HttpRuntime.Cache.Insert("weibo", jsonData, Dep, Cache.NoAbsoluteExpiration, TimeSpan.FromMinutes(2));

} 

				
/// <summary>
/// Responses the weibo data.
/// </summary>
/// <param name="context">The http contex.</param>
private void ResponseWeibo(HttpContext context)
{
    // Gets the weibo cache data.
    byte[] buf = Encoding.UTF8.GetBytes(HttpRuntime.Cache["weibo"].ToString());
    
    // Writes the data into output stream.
    context.Response.OutputStream.Write(buf, 0, buf.Length);
    context.Response.OutputStream.Flush();
    ////context.Response.Close();
}  

				
// The function to get weibo data.
loadWeibo: function() {
    $.ajax({
        // Weibo API.
    url: "WeiboHandler.ashx",
        type: "GET",
        // NOTE: We get the data from same domain,
        // dataType is json.
        dataType: "json",           
        data: {
            source: JQWeibo.appKey,
            count: JQWeibo.numWeibo
        },

        // When the requet completed, then invokes success function.
        success: function(data, textStatus, xhr) {

            // Sets html structure.
            var html =
        '<div class="weibo">' +
        '<a href="http://weibo.com/DOMAIN" target="_blank">USER</a>' +
        '：WEIBO_TEXT<div class="time">AGO</div>';

            // Appends weibos into html page.
            for (var i = 0; i < data.length; i++) {
                $(JQWeibo.appendTo).append(
            html.replace('WEIBO_TEXT', JQWeibo.ify.clean(data[i].text))

                // Uses regex and declare DOMAIN as global, if found replace all.
                .replace(/DOMAIN/g, data[i].user.domain)
                .replace(/USER/g, data[i].user.screen_name)
                .replace('AGO', JQWeibo.timeAgo(data[i].created_at))
        );
            }
        }
    })
}