Writing Messages to Event Log in SharePoint

In SharePoint using System.Diagnostics.EventLog class, you can write messages to event log.
Below is the code snippet for the same,

string source = "Demo Application";
if (!EventLog.SourceExists(source))
EventLog.CreateEventSource(source, "Application");
EventLog.WriteEntry(source, "Message!", EventLogEntryType.Error);

Custom aspx pages in SharePoint 2010

While migrating Custom aspx pages from MOSS 2007 to SP 2010, below mentioned pages directives are to be modified accordingly.

MOSS way of doing

<%@ Page Language="C#" Inherits="Microsoft.SharePoint.ApplicationPages.NewListPage" MasterPageFile="~/_layouts/application_Custom.master" %>

SP 2010 way of declaring the directive,

<%@ Page language="C#"
 MasterPageFile="~/_layouts/application_Custom.master"
 Inherits="Microsoft.SharePoint.WebPartPages.WebPartPage,Microsoft.SharePoint,Version=14.0.0.0,Culture=neutral,PublicKeyToken=71e9bce111e9429c"%>

If the page inherits publishing layouts page, the directive should be modified as shown below,

MOSS way of doing:

<%@ Page Language="C#" DynamicMasterPageFile="~masterurl/default.master" Inherits="Microsoft.SharePoint.Publishing.Internal.CodeBehind.CategoriesPage"%>

SP 2010 way of doing: 

Follow the below two steps to apply master page here. MasterPageFile tag is not supported directly.

1. <%@ Page Language="C#" Inherits="Microsoft.SharePoint.Publishing.PublishingLayoutPage,Microsoft.SharePoint,Version=14.0.0.0,Culture=neutral,PublicKeyToken=71e9bce111e9429c"%> 

2. And, then under script tag, override "OnPreInit" method & assign master page there.

protected override void OnPreInit(EventArgs e)
{
base.OnPreInit(e);
this.MasterPageFile = "SomeOther.master";
}

Copy attachments from one list item to another within a SharePoint site

Attachments for a list item are stored as SPFile objects under a hidden folder in the list where those attachments are stored. Each list item that has an attachment has its own folder with the ID of the item being the folder's name. Here is a code sample to copy attachments from one item to another:

private void CopyAttachments(SPWeb oSPWeb, SPListItem sourceItem, SPListItem targetItem)
{
//get the folder with the attachments for the source item
 SPFolder sourceItemAttachmentsFolder =      
 sourceItem.Web.Folders["Lists"].SubFolders[sourceItem.ParentList.Title]
.SubFolders["Attachments"].SubFolders[sourceItem.ID.ToString()];

//Loop over the attachments, and add them to the target item
 foreach (SPFile file in sourceItemAttachmentsFolder.Files)
 {
   byte[] binFile = file.OpenBinary();
   oSPWeb.AllowUnsafeUpdates=true;
   targetItem.Attachments.AddNow(file.Name, binFile);
   oSPWeb.AllowUnsafeUpdates=false;
 }
}

SharePoint people picker is not able to resolve names from different forests / domains

Some time back, I was caught into this issue after upgrading MOSS from SP1 to SP2. People Picker wasn't able to resolve users from different forests / domains.

After struggling for plenty of hours, I got the solution. Actually when you have to fetch users from different forests or domains, you should have user id & password detail of that specific domain with read access to directory services of that AD.

Execute the below mentioned command to edit property of people picker so that it can search cross forest / domain users.

Step 1. stsadm -o setapppassword -password key
Step 2. stsadm -o setproperty -url "http://portal_URL" -pn peoplepicker-searchadforests -pv "forest:FQFN;domain:FQDN",LoginID,Password

Step 1= Encrypts the password
Step 2= sets property of people picker.

a. portal_URL = Specify your portal / application URL
b. FQFN = Fully Qualified Forest Name
c. FQDN = Fully Qualified Domain Name
d. Login ID = Specify Login ID as (Domain Name\xyz)
e. Password = Specify password for the login. If password contains any special character, provide the password details in double chords. e.g "Hello,11"

If you have to add multiple forests / domains to people picker, you may have to execute below mentioned command for the same.

Step 1: stsadm -o setapppassword -password key
Step 2. stsadm -o setproperty -url "http://portal_URL" -pn peoplepicker-searchadforests -pv "forest:FQFN1;domain:FQDN1",LoginID1,Password1;"forest:FQFN2;
domain:FQDN2",LoginID2,Password2

As shown above, you can add multiple domains in single command line.

FQFN1, FQDN1, LoginID1, Password1 = details for first forest / domain
FQFN2, FQDN2, LoginID2, Password2 = details for second forest / domain

Note: Login IDs should atleast have read access to directory services of respective ADs.

Hope this may help you. Happy Blogging !!!