Delete a SharePoint ListItem using silverLight Client Object Model

Write this in button click event.

private string siteUrl = "http://Spserver:100/";

try

            {

                ClientContext clientContext = new ClientContext(siteUrl);

                List oList = clientContext.Web.Lists.GetByTitle("New Ideas");

                ListItem oListItem = oList.GetItemById(4);

                oListItem.DeleteObject();

                clientContext.ExecuteQueryAsync(onQuerySucceeded, onQueryFailed);

            }

            catch (Exception Ex)

            {

                lblErrorMessage.Content = Ex.ToString();

            }

private void onQuerySucceeded(object sender, ClientRequestSucceededEventArgs args)

        {

            UpdateUIMethod updateUI = DisplayInfo;

            this.Dispatcher.BeginInvoke(updateUI);

        }

        private void DisplayInfo()

        {

            //MyOutput.Text = "New item created in " + oList.Title;

            lblErrorMessage.Content = "Item Deleted";

        }

        private delegate void UpdateUIMethod();

        private void onQueryFailed(object sender, ClientRequestFailedEventArgs args)

        {

            MessageBox.Show("Request failed. " + args.Message + "\n" + args.StackTrace);

        }

Update a SharePoint ListItem using silverLight Client Object Model

Write this in button click event.

private string siteUrl = "http://SpServer:100/";

try

            {

                ClientContext clientContext = new ClientContext(siteUrl);

                List oList = clientContext.Web.Lists.GetByTitle("New Ideas");

                ListItem oListItem = oList.GetItemById(3);

                oListItem["Title"] = txtNewIdea.Text;

                oListItem.Update();

                clientContext.ExecuteQueryAsync(onQuerySucceeded, onQueryFailed);

            }

            catch (Exception Ex)

            {

                lblErrorMessage.Content = Ex.ToString();

            }

private void onQuerySucceeded(object sender, ClientRequestSucceededEventArgs args)

        {

            UpdateUIMethod updateUI = DisplayInfo;

            this.Dispatcher.BeginInvoke(updateUI);

        }

        private void DisplayInfo()

        {

            //MyOutput.Text = "New item created in " + oList.Title;

            lblErrorMessage.Content = "Item Updated";

        }

        private delegate void UpdateUIMethod();

        private void onQueryFailed(object sender, ClientRequestFailedEventArgs args)

        {

            MessageBox.Show("Request failed. " + args.Message + "\n" + args.StackTrace);

        }

Insertion into a SharePoint List using SilverLight Client Object Model.

Ascx

<UserControl x:Class="InsertApp_Silverlight.MainPage"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"     mc:Ignorable="d"     d:DesignHeight="300" d:DesignWidth="400" xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation" xmlns:dataInput="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data.Input">     <Grid x:Name="LayoutRoot" Background="White">         <dataInput:Label Height="19" HorizontalAlignment="Left" Margin="106,30,0,0" Name="lblHeading" VerticalAlignment="Top" Width="176" Content="Insertion Sample into SharePoint List using SilverLight Client Object Model" />         <dataInput:Label Height="19" HorizontalAlignment="Left" Margin="74,65,0,0" Name="lblTitle" VerticalAlignment="Top" Width="94" Content="Enter Title" />         <TextBox Height="23" HorizontalAlignment="Left" Margin="141,63,0,0" Name="txtTitle" VerticalAlignment="Top" Width="120" />         <Button Content="Save Record" Height="23" HorizontalAlignment="Left" Margin="117,108,0,0" Name="btnSave" VerticalAlignment="Top" Width="118" Click="btnSave_Click" />     </Grid> </UserControl>

Ascx.Cs

using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; using Microsoft.SharePoint.Client; namespace InsertApp_Silverlight {     public partial class MainPage : UserControl     {         public MainPage()         {             InitializeComponent();         }         private void btnSave_Click(object sender, RoutedEventArgs e)         {             try             {                 ClientContext context = ClientContext.Current;                 Web currentWeb = context.Web;                 List lst = currentWeb.Lists.GetByTitle("New Ideas");                 ListItem item = lst.AddItem(new ListItemCreationInformation());                 item["Title"] = txtTitle.Text;                 item.Update();                 context.Load(lst, NewIdeasList => NewIdeasList.Title);                 context.ExecuteQueryAsync(onQuerySucceeded, onQueryFailed);             }             catch (Exception Ex)             {                 MessageBox.Show(Ex.ToString());             }         }         private void onQuerySucceeded(object sender, ClientRequestSucceededEventArgs args)         {             UpdateUIMethod updateUI = DisplayInfo;             this.Dispatcher.BeginInvoke(updateUI);         }         private void DisplayInfo()         {             MessageBox.Show("Item Inserted Successfully");             txtTitle.Text = "";         }         private delegate void UpdateUIMethod();         private void onQueryFailed(object sender, ClientRequestFailedEventArgs args)         {             MessageBox.Show("Request failed. " + args.Message + "\n" + args.StackTrace);         }     } }