add SPListItem to a SPListItemCollection

add SPListItem to a SPListItemCollection

By : Sean Conklin
Date : November 19 2020, 03:54 PM
With these it helps You are trying to add an item into null because your ITEM is null. I don't know what error you are getting ( your don't write it) but you must initialize your collection:
code :
    if (items.Count > 0)
          DataRow dr=null;
          SPListItemCollection ITEM = ... //
          foreach(SPListItem item in items)
              string A = item["Approval Status"].ToString();
              if(A== "2")
                 SPListItem myItem = ITEM.Add();
                 // set your item's fields here 
                 // Use indexers on this object for each field to assign specific values, and then call the Update method on the item to effect changes in the database.
                 myItem["Approval Status"] = item["Approval Status"];
             lbldata.Text = "No data to show";

             //  dt = items.GetDataTable();


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Accessing a SPListItem from SPListItemCollection directly

Accessing a SPListItem from SPListItemCollection directly

By : user1431860
Date : March 29 2020, 07:55 AM
will help you Not out of the box - see the question How to access List Items in a list for the options. Retrieving the information with SPQuery is recommended to avoid placing too much load on the database. There is more information on how to use that in my answer to SharePoint : Check if item exists in a list, minimum overhead:
A good alternative is to use LINQ. This option has been provided by the community (Keith Dahlby and Wictor Wilén) and is available in the SharePoint Extensions Lib.
Converting SPListItemCollection into DataTable

Converting SPListItemCollection into DataTable

By : ramesh
Date : March 29 2020, 07:55 AM
help you fix your problem there is no reason for LINQ to be more efficient. However, it is more readable. If you care much about performance do not use LINQ. If on the other hand performance is not an issue then it is more readable. Here is some more on readabilty.
Sharepoint -- Get the difference between two SPListItemCollection

Sharepoint -- Get the difference between two SPListItemCollection

By : Vicky Garcia
Date : March 29 2020, 07:55 AM
seems to work fine You can use Cast to use all IEnumerable LINQ methods like Contains(). Using try-catch for this is not too pretty solution, imho. You can do it in one simple line:
code :
var noAccessListItems = regularListItems.Cast<SPListItem>().Where(x => !superListItems.Cast<SPListItem>().Select(y => y.ID).Contains(x.ID));
var noAccessListItems = regularListItems.Cast<SPListItem>().Except(superListItems.Cast<SPListItem>());
class SPListItemEqualityComparer : IEqualityComparer<SPListItem>
    public bool Equals(SPListItem i1, SPListItem i2)
        return i1.ID == i2.ID;

    public int GetHashCode(SPListItem item)
        int hCode = item.ID;
        return hCode.GetHashCode();
var noAccessListItems = superListItems.Except(regularListItems, new SPListItemEqualityComparer());
add multiple SPList to SPListItemCollection

add multiple SPList to SPListItemCollection

By : Vince Vitali
Date : March 29 2020, 07:55 AM
I wish this help you I always like to use List<> to handle these. To do that, make sure you add
code :
using System.Linq;
List<SPListItem> allItems = new List<SPListItem>();

//Do something to the "allItems"
c# sharepoint how to set a FIELD Value of SPListItem with FIELD Value from other SPListItem?

c# sharepoint how to set a FIELD Value of SPListItem with FIELD Value from other SPListItem?

By : Rafael Padilha
Date : March 29 2020, 07:55 AM
Does that help this is useful case, and I always try it source from Get And Set Value By Field Internal Name
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