Add, Update and Delete List Items Programmatically in Sharepoint

Programmatically adding items to a SharePoint list

using(SPSite site = new SPSite("http://"))

{

using (SPWeb web = site.OpenWeb())

{

SPList list = web.Lists["SharePointList"]; // you can use web.GetList method which is better for performance.

SPListItem Item = list.Items.Add();

item["Title"] = txtCompanyName.Text; // the text which need to update

//can add required items

 item.Update();

}

}

Note: 1. No need to use SPSecurity.RunWithElevatedPrivileges.
2. No need to use allowunsafeupdate property
3. No need to update web object.

Updating a List Item programmatically

Introduction:

In this article I am going to explain you how to update list item programmatically .
Also I will explain you that How to “update content type of list item programmatically” which is little tricky.

The Code:

Update List Item metadata:-

Get the SPListeItem object and update metdata. At lst never forget to use “SPListItem.update()”.
See sample code below:-

using(SPSite oSite = new SPSite("site url")) {         using(SPWeb oWebsite = oSite.OpenWeb())         {                SPList oList = oWebsite.Lists["Tasks"];                SPListItem oListItem = oList.Items[5];                oListItem["Title"] = "Some Title";                oListItem.Update();// without this line item will not update         } }

Update List Item content type:-

Trick:- To update content type of list item, we need to assign content type id rather than content type name.

using(SPSite oSite = new SPSite("site url")) {         using(SPWeb oWebsite = oSite.OpenWeb())         {                string cTypeName = "NewContentType";                SPList oList = oWebsite.Lists["Tasks"];                // get content type id                SPContentType spCType = oList.ContentTypes[cTypeName];                SPListItem oListItem = oList.Items[5];                // below line will not update content type                // oListItem["ContentType"] = “NewContentType”;                // Correct implementation to apply new content type                oListItem["ContentTypeId"] = spCType.Id.ToString();                oListItem.Update();         } }

Delete selected Items from sharepoint list programmatically

Introduction

There are few ways to delete item from sharepoint list, however I like the way to perform ProcessBatchData method (approach 1 in this article) which seems faster to me.

Here I am going to explain about 2 approaches in which we will  use SPListItem.Delete or SPWeb.ProcessBatchData method. My example will delete items from list if DeptID match with list item.

Approach 1 (SPWeb.ProcessBatchData):

/// get SPListItemCollection using spquery. /// generate query for all items /// Pass query into ProcessBatchData method. Public void DeleteItemUsingBatch(string deptId) {     using (SPSite site = new SPSite(SPContext.Current.Web.Url))     {         SPWeb web = site.OpenWeb();         web.AllowUnsafeUpdates = true;         SPList list = web.Lists[“Departments”];         SPQuery query = new SPQuery();         query.Query = "<Where> <Eq><FieldRef Name=’deptId’ /><Value Type=’Lookup’>" +                          deptId + "</Value> </Eq></Where>";         SPListItemCollection listItem = list.GetItems(query);         StringBuilder sbDelete = new StringBuilder();         string xmlFormat = @"<?xml version=\"1.0\" encoding=\"UTF-8\"?>";         sbDelete.Append(xmlFormat);         sbDelete.Append("<Batch>");         string buildQuery = "<Method><SetList Scope=\"Request\">" + list.ID + "</SetList>";         buildQuery = buildQuery +         "<SetVar Name=\"ID\">{0}</SetVar><SetVar Name=\"Cmd\">Delete</SetVar></Method>";         foreach (SPListItem item in listItem)         {                sbDelete.Append(string.Format(buildQuery, item.ID.ToString()));         }         sbDelete.Append("</Batch>");         web.ProcessBatchData(sbDelete.ToString());     } }

Approach 2 (SPListItem.Delete):

/// get SPListItemCollection using spquery. /// Create loop as per SPListItemCollection.count /// in loop Delete item using SPListItem.delete. Public void DeleteItemWithoutBatch(string deptId) {         SPWeb web = site.OpenWeb();         web.AllowUnsafeUpdates = true;         SPList list = web.Lists[“Departments”];         SPQuery query = new SPQuery();         query.Query = "<Where> <Eq><FieldRef Name=’deptId’ /><Value   Type=’Lookup’>" +deptId + "</Value> </Eq></Where>";         SPListItemCollection listItems = list.GetItems(query);         int itemCount = listItems.Count;         for (int k=0; k<itemCount; k++)         {                SPListItem item = listItems[k];                listItems.Delete(k);         } }

delete entire sharepoint list (Approach 1)

/// To delete list you need 2 things /// 1. Get SPListCollection object /// 2. Get SPList object for list which need to be deleted. /// Then you can use like this <SPListCollection object>.Delete(SPList.ID) SPList list; SPListCollection lists; using (SPSite site = new SPSite("site url")) {         using (SPWeb web = site.OpenWeb())         {                lists = web.Lists;                string listPath = "/lists/testlist"; // you can write your list path                list = web.GetList(listPath);         } } System.Guid listGuid = list.ID; lists.Delete(listGuid);

delete entire sharepoint list (Approach 2)

/// To delete list you need 2 things /// 1. Get SPList object for list which need to be deleted /// 2. Then you can use like this <SPList object>.Delete() SPList list; using (SPSite site = new SPSite("site url")) {         using (SPWeb web = site.OpenWeb())         {                                     string listPath = "/lists/testlist"; // you can write your list path                list = web.GetList(listPath);         } } list.Delete();