ADD|Update|Delete Item in list by using SharePoint Web Services

Here we discuss how we can update a SharePoint list using Web Services. Please refer my previous article on "SharePoint List Web Service GetListItems" to learn how to add Web References to your project. Then you can use the following sample codes to Update SharePoint lists.

Updating Existing Items
In the following code I have update the "Tasks" list, there I have update the title of two items which has the ID 7 and 10.


public void updateListItemsWS()
{
    WS_Lists.Lists myservice = new WS_Lists.Lists();
    myservice.Credentials = System.Net.CredentialCache.DefaultCredentials;
    myservice.Url = "http://mermoss:5050/testsara/_vti_bin/Lists.asmx";
    try
    {
        System.Xml.XmlDocument xmlDoc = new System.Xml.XmlDocument();
        System.Xml.XmlElement elBatch = xmlDoc.CreateElement("Batch");

        elBatch.SetAttribute("OnError", "Continue");
        elBatch.SetAttribute("ListVersion", "1");

        string strBatch = "<Method ID='1' Cmd='Update'>" +
              "<Field Name='ID'>7</Field>" +
              "<Field Name='Title'>Sara1</Field></Method>" +
              "<Method ID='2' Cmd='Update'><Field Name='ID' >10</Field>" +
              "<Field Name='Title'>Sara2</Field></Method>";

        elBatch.InnerXml = strBatch;
        myservice.UpdateListItems("Tasks", elBatch);

    }
    catch (Exception ex)
    {
        Response.Write(ex.Message);
    }
}

Delete Items:

To delete item, use following phrase in the above code, this will delete the item which has ID of 10.

string strBatch = "<Method ID='1' Cmd='Delete'>" +
"<Field Name='ID'>10</Field></Method>";

Add New Item:
To add item, use following phrase in the above code,

string strBatch = "<Method ID='1' Cmd='New'>" +
"<Field Name='ID'>New</Field>"+
"<Field Name='Title'>TestTitle1</Field>"+
"</Method>";