c# - how can I swap two child entity values -

i have entity called "space" , inside has "images". images has ordering property int. i'm trying see if there easy linq can made swap ordering values.

public class space {     public int spaceid { get; set; }     public virtual icollection<spaceimage> images { get; set; } }  public class spaceimage {     public int spaceimageid { get; set; }     public byte[] image { get; set; }     public byte[] imagethumbnail { get; set; }     public string contenttype { get; set; }     public int ordering { get; set; } } 

ex. image might have ordering 3 , have 6, want swap these 2 numbers each of these images

public void swap(int spaceid, int old, int new) {     //swap 3 , 6 ordering value 2 spaceimages contain these values spaceid spaceid } 

in general, linq used querying. use find appropriate spaceimage instances, set values appropriately:

// assuming method in space class public void swap(int oldorder, int neworder) {     var oldinst = this.images.firstordefault(si => si.ordering == oldorder);     var newinst = this.images.firstordefault(si => si.ordering == neworder);      if (oldinst != null && newinst != null)     {         oldinst.ordering = neworder;         newinst.ordering = oldorder;     }     else     {         // there weren't matching images - handle case here     } }