How to delete organizations in CRM?

As per many peoples, Once organization created in CRM it will be disabled but never deleted.
It's wrong,If required to delete existing organizations then read the following paragraph.

When an administrator creates a new organization in the Enterprise Edition of
Microsoft Dynamics CRM, the organization information is stored in the
configuration database. Similarly, the administrator can remove an existing
organization from the configuration database, although the organization must be
disabled first before it can be deleted. And if there are no more organizations left
in the configuration database, the administrator can uninstall Microsoft Dynamics
CRM from the server(s).

Update page size in CRM 4.0

As defined in CRM you can increase your page size maximum of 250 records, but if you need to resize it for 1000-2000 records then you are unable to do it, you can do it in unsupported way after using the following code.

update usersettings set PagingLimit=1900 where ModifiedByName='user name'

Refresh your CRM panel, if not reflecting then reset application Pool in IIS.

What is CredentialCache Class in CRM SDK

The CredentialCache class stores credentials for multiple Internet resources. Applications that need to access multiple resources can store the credentials for those resources in a CredentialCache instance that then provides the proper set of credentials to the Internet resource when required. When the GetCredential method is called, it compares the Uniform Resource Identifier (URI) and authentication type provided with those stored in the cache and returns the first set of credentials that match.

The DefaultCredentials property contains the system credentials of the current security context. For client applications, these represent the user name, password, and domain of the user who is currently logged in. For ASP.NET applications, the default credentials are the user credentials of the logged-in user or the user being impersonated.

How to cancel Save Operation in MS CRM4.0

Pass this line of code to prevent saving the current items in CRM.
// Cancel the save operation.
event.returnValue = false;

Read-Only fields Values don’t get saved in the database.

After changing the value of a read-only field with JavaScript the new value will not be saved into the database.

To save the newvalue set the ForceSubmit property of the field to true.

crmForm.all.new_customfield.ForceSubmit = true;

Attach an Event for a Lookup in JavaScript MS CRM 4.0

Some time we required to call a JavaScript function after selection the Lookup value for this use the below line of code to attach event.

crmForm.all.objectid.attachEvent("onafterselect", javaScriptFunctionName);

Attaching to Processes

Now that you have the plug-in registered, you are ready to start debugging. You need to attach to W3WP.exe(for synchronous services) to attach to plug-ins since they run within IIS. To attach to workflows you need to attach to the CRM async service which is Crmasyncservice.exe(for asynchronous services).