Sunday, October 25, 2009

Fragment Caching in ASP.NET

ASP.NET provides a mechanism for caching portions of pages, called page fragment caching. To cache a portion of a page, you must first encapsulate the portion of the page you want to cache into a user control. In the user control source file, add an OutputCache directive specifying the Duration and VaryByParam attributes. When that user control is loaded into a page at runtime, it is cached, and all subsequent pages that reference that same user control will retrieve it from the cache.

<%@ OutputCache Duration='60'
VaryByParam='none' %>
<%@ Control Language="'C#'" %>

Here I have user caching on user control, so when ever we used in a page , only partial page will be cached.

To get Collection of checked items in CheckedListBox

private void WhatIsChecked_Click(object sender, System.EventArgs e) {
// Display in a message box all the items that are checked.

// First show the index and check state of all selected items.
foreach(int indexChecked in checkedListBox1.CheckedIndices) {
// The indexChecked variable contains the index of the item.
MessageBox.Show("Index#: " + indexChecked.ToString() + ", is checked. Checked state is:" +
checkedListBox1.GetItemCheckState(indexChecked).ToString() + ".");

// Next show the object title and check state for each item selected.
foreach(object itemChecked in checkedListBox1.CheckedItems) {

// Use the IndexOf method to get the index of an item.
MessageBox.Show("Item with title: \"" + itemChecked.ToString() +
"\", is checked. Checked state is: " +
checkedListBox1.GetItemCheckState(checkedListBox1.Items.IndexOf(itemChecked)).ToString() + ".");

Locations of visitors to this page