Delete in the SharePoint List using Client Object Model within a WebPart.

try
{
SPWeb currentWeb = SPContext.Current.Web;
ClientContext clientContext = new ClientContext(currentWeb.Url);
Web web = clientContext.Web;
List list = web.Lists.GetByTitle("Login");
CamlQuery query = new CamlQuery();
query.ViewXml = @"<Query><Where><Eq><FieldRef Name='ID' /><Value
Type='Counter'>" + ddlID.SelectedItem.Value + "</Value></Eq></Where></
Query>";
Microsoft.SharePoint.Client.ListItemCollection listItems =
list.GetItems(query);
clientContext.Load(listItems);
clientContext.ExecuteQuery();
foreach (Microsoft.SharePoint.Client.ListItem item in listItems)
{
if (ddlID.SelectedItem.Value == item["ID"].ToString())
{
item.DeleteObject();
//item.Update();
break;

}
}

clientContext.ExecuteQuery();
//string strRedirect = currentWeb.Url + "/UserPages/Updation Using
Com.aspx";
//Page.Server.Transfer(strRedirect);
ddlID.Items.Clear();
Microsoft.SharePoint.Client.ClientContext ctx = new
Microsoft.SharePoint.Client.ClientContext(currentWeb.Url);
Microsoft.SharePoint.Client.List lstLogin =
ctx.Web.Lists.GetByTitle("Login");
Microsoft.SharePoint.Client.CamlQuery sQuery =
Microsoft.SharePoint.Client.CamlQuery.CreateAllItemsQuery();
sQuery.ViewXml = @"<View><Query><OrderBy><FieldRef Name='ID'
Ascending='False' /></OrderBy></Query></View>";
Microsoft.SharePoint.Client.ListItemCollection myColl =
lstLogin.GetItems(sQuery);
ctx.Load(myColl);
ctx.ExecuteQuery();
if (myColl.Count > 0)
{
foreach (Microsoft.SharePoint.Client.ListItem item in myColl)
{
ddlID.Items.Add(item["ID"].ToString());

}

ctx.Load(lstLogin.GetItems(sQuery));

}

ddlID.Items.Insert(0, new System.Web.UI.WebControls.ListItem("Select
ID"));
strError += "Deletion Successful";
txtUserName.Text = "";
txtPassWord.Text = "";

}

catch (Exception ex)
{
strError += ex.ToString();
}