Using Microsoft Sharepoint APIs we can easily Add, Update and Delete list items programmatically. Provided below is a code snippet in C# .Net demonstrating all the three operations..
using (SPSite oSPsite = new SPSite("http://website url/"))
using (SPWeb oSPWeb = oSPsite.OpenWeb())
oSPWeb.AllowUnsafeUpdates = true;
// Fetch the List
SPList list = oSPWeb.Lists.TryGetList("MyList");
if(list !=null && list.Items.Count>0)
//Add a new item in the List
SPListItem itemToAdd = list.Items.Add();
itemToAdd["Title"] = "Test Title";
itemToAdd["Description"] = "Test Description";
// Get the Item ID
listItemId = itemToAdd.ID;
// Update the List item by ID
SPListItem itemToUpdate = list.GetItemById(listItemId);
itemToUpdate["Description"] = "Changed Description";
// Delete List item
SPListItem itemToDelete = list.GetItemById(listItemId);
oSPWeb.AllowUnsafeUpdates = false;
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