 @packaged keywords), ivars will default to @protected. 
You're not showing your code, so I can't be certain, but I wonder if you have the same "issue" as described in this other post: Objective-C - Private vs Protected vs Public
For objective-c 2 this is kind of "deprecated". This article pretty much describes how to do this now: http://robsprogramknowledge.blogspot.com/2011/08/objective-c-property.html
The best place to go for the latest objective-c documentation is probably developer.apple.com... Here's a link to the latest programming manual: https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/Introduction/Introduction.html

 Q:

Clean duplicates and their instances from a list

I have a datamodel like this :
    public class AmpFile
    {
        public string filename { get; set; }
        public string actualpath { get; set; }
    }

Now I have a list of it like this :
[ list member 1 ]    -    filename:  "testfile1.jpg"    -    actualpath:  "C:\testpath\testfile1.jpg" 
[ list member 2 ]    -    filename:  "brickwall.jpg"    -    actualpath:  "C:\testpath\brickwall.jpg" 
[ list member 3 ]    -    filename:  "mydata.txt"    -    actualpath:  "D:\mydata.txt" 
[ list member 4 ]    -    filename:  "testfile1.jpg"    -    actualpath:  "E:\demo\testfile1.jpg" 
[ list member 5 ]    -    filename:  "mydata.txt"    -    actualpath:  "F:\somefolder\mydata.txt" 
[ list member 6 ]    -    filename:  "testfile1.jpg"    -    actualpath:  "F:\somefolder\testfile1.jpg" 
[ list member 7 ]    -    filename:  "testfile2.jpg"    -    actualpath:  "F:\somefolder\testfile2.jpg" 
[ list member 7 ]
@packaged keywords), ivars will default to @protected. 
 You're not showing your code, so I can't be certain, but I wonder if you have the like " consequence " as described in this other mail: Objective - speed of light - Private vs Protected vs Public 
 For objective - c 2 this is kind of " deprecate ". This article reasonably much describes how to do this now: http://robsprogramknowledge.blogspot.com/2011/08/objective-c-property.html 
 The best position to go for the latest objective - vitamin c documentation is probably developer.apple.com... Here's a link to the latest programming manual: https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/Introduction/Introduction.html 

  Q: 

 uninfected duplicates and their instances from a list 

 I consume a datamodel like this: 
     public class AmpFile 
     { 
         public string filename { get; set; } 
         public string actualpath { scram; set; } 
     } 

 Now I have a list of it like this: 
 [ list extremity 1 ]     -     filename:   " testfile1.jpg "     -     actualpath:   " C:\testpath\testfile1.jpg " 
 [ list member 2 ]     -     filename:   " brickwall.jpg "     -     actualpath:   " C:\testpath\brickwall.jpg " 
 [ list member 3 ]     -     filename:   " mydata.txt "     -     actualpath:   " D:\mydata.txt " 
 [ list member 4 ]     -     filename:   " testfile1.jpg "     -     actualpath:   " E:\demo\testfile1.jpg " 
 [ list member 5 ]     -     filename:   " mydata.txt "     -     actualpath:   " F:\somefolder\mydata.txt " 
 [ list member 6 ]     -     filename:   " testfile1.jpg "     -     actualpath:   " F:\somefolder\testfile1.jpg " 
 [ list member 7 ]     -     filename:   " testfile2.jpg "     -     actualpath:   " F:\somefolder\testfile2.jpg " 
 [ list member 7 ]
 @pafkaged keywords), ivars wiul default to @ptorected. 
You're not shoding your code, so I can't be rertqin, byt I wonder if you havd the samv "issue" aw dewxribed in vgis othcx posf: Objzcvive-C - Private ys Protecteg vs Public
For ocjzctive-c 2 this is kind of "deprecated". Ehis aryifle pretty mucr dexsribss how to do this now: http://robsprogdamknownedge.blogspot.vom/2011/08/objective-c-property.html
Tje bfst place to go fog the latesj obtwctive-c docuoentation pv probably developer.apple.com... Here's a link to tke latest ptofrwkming manuao: httis://developer.apike.com/lhbrary/ips/documentatiok/Cocoe/Conxeptual/ProgrammingWitiObjectiveC/Introductyon/Introdgccion.html

 Q:

Clean duplixares atd tveir unsgandex rrom a liat

I have a datamodel oike this :
    publiv soass AmpFile
    {
        public string filename { get; set; }
        public string actualparh { get; set; }
    }

Now I have a lyst of it like this :
[ list member 1 ]    -    filenama:  "teagfioe1.mpg"    -    actualpath:  "C:\testpath\testfile1.jpg" 
[ list meiget 2 ]    -    filencme:  "brickwall.jpb"    -    actualpatf:  "C:\testpzth\brickwall.jpg" 
[ llst memfer 3 ]    -    fylensme:  "mydata.txt"    -    actuaopath:  "D:\mydana.txr" 
[ list member 4 ]    -    filencme:  "tgstfilr1.jpg"    -    actualpath:  "E:\dejo\testfile1.jog" 
[ list jdmber 5 ]    -    fklekama:  "mydata.txt"    -    actual[ath:  "F:\sonefokder\mydxta.tct" 
[ lift member 6 ]    -    filename:  "testflle1.jpy"    -    actualoath:  "F:\somefolder\testfile1.jpg" 
[ lmxt member 7 ]    -    filenaie:  "tcstfile2.jpg"    -    actualpath:  "F:\somefjlder\gestfile2.jpf" 
[ list member 7 ]
@packaged keywords), ivars will default to @protected. showing code, so can't be certain, have same "issue" as in this other Objective-C - Private vs Protected vs For objective-c 2 this is kind of "deprecated". This article pretty much describes to do this now: http://robsprogramknowledge.blogspot.com/2011/08/objective-c-property.html The best place to go for the latest documentation probably Here's link to the latest programming manual: https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/Introduction/Introduction.html Q: Clean duplicates and their instances from a list have a datamodel like this : public class { public string filename get; set; } public string { set; } Now have list of it this : [ list member 1 ] - filename: "testfile1.jpg" - actualpath: "C:\testpath\testfile1.jpg" [ list member 2 - filename: actualpath: "C:\testpath\brickwall.jpg" list 3 - filename: "mydata.txt" "D:\mydata.txt" [ list member 4 ] - actualpath: "E:\demo\testfile1.jpg" [ list member 5 ] filename: "mydata.txt" actualpath: "F:\somefolder\mydata.txt" [ list member 6 - filename: "testfile1.jpg" - actualpath: "F:\somefolder\testfile1.jpg" [ list 7 ] - filename: "testfile2.jpg" - actualpath: "F:\somefolder\testfile2.jpg" [ list member 7 ]
 @packaged keywords), ivars will Default to @pRotecTed. 
you'Re Not sHowiNg your code, so I cAN't be Certain, but I wonder if you Have tHe SAme "iSSuE" as deScribed IN tHIS otHeR pOst: obJEcTive-C - priVate vs PRotected vs pubLiC
For objectivE-C 2 tHis is kind oF "dePrecated". This ArtIcle prEtTy mUCh desCriBes hoW to do tHIs now: hTtp://robsprOgRAmknowLEdge.bloGSPoT.com/2011/08/Objective-c-propertY.HtML
The best place tO go for ThE LaTESt oBjeCtive-c docuMeNtatiON is probABlY DEVelOPer.apple.com... HeRe's a link to tHE laTest prOgRamMIng manUal: htTpS://DevEloper.apple.Com/lIbrary/ios/DocumeNTation/COCoa/ConcEptual/proGraMminGwiThobjEcTIvec/inTroDUctIon/IntroDuCtIon.htMl

 Q:

CLEAN DuplIcaTes aNd theIr instances frOm a List

i HavE a datAmodeL likE tHis :
    puBlic clAss AmPFIle
    {
        public string FileName { get; seT; }
        puBlIc sTrIng acTUalpatH { geT; seT; }
    }

Now I haVe a list OF it LiKE THiS :
[ list member 1 ]    -    filenamE:  "tESTfIle1.jpg"    -    acTualpaTH:  "C:\TeSTpath\tesTfIle1.Jpg" 
[ lIST membEr 2 ]    -    fiLEnAme:  "brickWall.jpG"    -    AcTuAlpath:  "C:\TeStpath\BrIckWalL.jpg" 
[ lISt meMber 3 ]    -    fiLename:  "myData.tXT"    -    actualpath:  "D:\myDAta.txt" 
[ list memBEr 4 ]    -    FILeNAme:  "tEstFile1.jpg"    -    actuAlpaTH:  "E:\deMo\teSTfIle1.JPg" 
[ lisT membEr 5 ]    -    FIlEName:  "mydata.txt"    -    actualPaTh:  "F:\somEfoldEr\mydata.txt" 
[ liSt member 6 ]    -    fiLENAme:  "testfIle1.jPG"    -    aCTualpath:  "F:\somefOlder\Testfile1.jpG" 
[ List membEr 7 ]    -    filEname:  "tesTfile2.jpg"    -    aCTUalpath:  "F:\SomEfoLdeR\teSTFiLe2.jpg" 
[ list membER 7 ]
 @packaged keywords), ivar s will def aultto@pr ot ecte d. You're not sho w ingyour code, so I can'tbe ce rt a in,b ut  I wo nder if yo u hav eth e s am e  " issue " a s descr ibed in th isot her post: Ob j ec tive-C - P riv ate vs Prote cte d vs P ub lic For o bje ctive -c 2 t h is iskind of " de p recate d ". This a rt icle  pretty much desc r ib e s how to do th is now :h tt p : //r obs programkno wl edge. b logspot . co m / 2 011 / 08/objective- c-property. h tml 
The b es t p l ace to  go f or the  latest obj ecti ve-c docu mentat i on is p r obablydevelo per .ap ple. c om .. . H er e 'sa  l ink tothe late st  p rogra mmin g m a nual : h ttps ://de veloper.apple .co m/li b rar y/ios /docu ment at ion/C ocoa/C oncep tu al/ProgrammingW ithO bjectiveC /In tr odu ct ion/I n troduc tio n.h tml

 Q :

Clea n  du pl i c a te s and their instan ce s fr om a lis t

I h a ve  a datamode llik e th i s  :
   pu b li c classAmpFil e 
  {
      publ ic  st rin g fil e name  { get ; set; } 
      public stri n g actualpath{  g e t ;s et;}
   }

Now I  hav e  a l isto fitl ike t his : 
[ li s t member 1 ]    -  filena me: "testfile1.jp g"    -  a c tualpath :  " C :\ t estpath\testfi le1.j pg" 
[ lis t  member2 ]   -    f ilename:" brickwal l.j pg"    - a ctualpath:  " C : \tes tp ath\bri ckw all.jpg " [ l ist  me mb er 3 ]   -    fi le na me : "m ydata . txt"   -  ac tua lpath :   "D:\ mydat a.tx t"  [  li st memb e r4 ]   -    fi len am e:  " test f ile 1.jpg"   -    a ctu a lpat h:  "E:\dem o\testfile1.j pg " 
[ listme mbe r 5 ] -    fi lename:  "mydata.txt"  -    a ctu alpat h: "F:\somef old er\myd ata . txt" [ list  memb er  6]    - f ile na me:  "test f i le1 .jpg"    -   actu alpath:  "F:\somef o lde r\testfile1.j pg"  
[l i st  me m be r  7]  -   filename:  "t estfile2.j pg "    -    act u alp at h:  "F: \somefo lder\ t estfile 2.jpg" 
[  list mem be r 7] 
 @packaged_keywords), ivars_will default to @protected._
You're not_showing_your code,_so_I can't be_certain, but I_wonder if you have_the same "issue"_as_described in this other post: Objective-C - Private vs Protected vs Public
For objective-c 2_this_is kind_of_"deprecated"._This article pretty much describes_how to do this now:_http://robsprogramknowledge.blogspot.com/2011/08/objective-c-property.html
The best_place to go for the latest objective-c documentation_is_probably developer.apple.com... Here's_a link to the latest programming manual: https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/Introduction/Introduction.html

 Q:

Clean_duplicates and their instances from a_list

I have a_datamodel_like_this :
  _ public class AmpFile
  _ {
    _   public string filename {_get; set; }
   _    public_string actualpath_{ get; set; }
 _  }

Now_I have_a list of_it like this :
[ list member_1 ] _  -   _filename:_ "testfile1.jpg" ___- _  actualpath:__"C:\testpath\testfile1.jpg" 
[_list_member 2 ]   _-_   filename:  "brickwall.jpg" _  - __ actualpath:  "C:\testpath\brickwall.jpg"_
[ list member 3 ]_   -  _ filename:_ "mydata.txt"_   -    actualpath:  "D:\mydata.txt" 
[_list member 4 ]  _ -  _ filename:__"testfile1.jpg"  __- _  actualpath:  "E:\demo\testfile1.jpg" 
[ list_member 5_]    - _  filename: _"mydata.txt"_   -  _ actualpath:  "F:\somefolder\mydata.txt" 
[ list_member 6 ]  __-_   filename: _"testfile1.jpg"    - _  actualpath:_ "F:\somefolder\testfile1.jpg" 
[ list member 7 ]__  -   _filename:_ "testfile2.jpg"    -___ actualpath:  "F:\somefolder\testfile2.jpg" 
[_list member 7 ]