is it possible to sort hash table while binding it to dropdown

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i have hash table like below...

C#

public Hashtable BindDD()
    {
        Hashtable objDd = new Hashtable();
        objDd.Add("0", "DD");
        objDd.Add("1", "1");
        objDd.Add("2", "2");
        objDd.Add("3", "3");
        objDd.Add("4", "4");
        objDd.Add("5", "5");
        objDd.Add("6", "6");
        objDd.Add("7", "7");
        objDd.Add("8", "8");
        objDd.Add("9", "9");
        objDd.Add("10", "10");
        objDd.Add("11", "11");
        objDd.Add("12", "12");
        objDd.Add("13", "13");
        objDd.Add("14", "14");
        objDd.Add("15", "15");
        objDd.Add("16", "16");
        objDd.Add("17", "17");
        objDd.Add("18", "18");
        objDd.Add("19", "19");
        objDd.Add("20", "20");
        objDd.Add("21", "21");
        objDd.Add("22", "22");
        objDd.Add("23", "23");
        objDd.Add("24", "24");
        objDd.Add("25", "25");
        objDd.Add("26", "26");
        objDd.Add("27", "27");
        objDd.Add("28", "28");
        objDd.Add("29", "29");
        objDd.Add("30", "30");
        objDd.Add("31", "31");
        return objDd;
    }

i am binding this return value to dropdown

C#

public void BindDD()
   {
       Hashtable ht = (new GlobalConstants().BindDD());
       ddlDD.DataSource = ht;
       ddlDD.DataTextField = "Value";
       ddlDD.DataValueField = "Key";
       ddlDD.DataBind();
   }

Here is my Problem when i am binding to drop down i am not able bind in order..in which i added to hash table. is it possible to sort the hash table .. Plz help me in solving this problem ..

Thanks in advance..

Posted 13-Mar-12 17:49pm

Rajesh Yerramsetti

Updated 13-Mar-12 17:51pm

Ganesan Senthilvel

v2

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3 solutions

Solution 1

If you want sortable, you're using the wrong collection. HashTables are not meant to be sortable. List<t> is. So why not make a small class or structure (depending on requirements) and create a List<t> of that type. Then you can sort it to your hearts content and even provide your own custom sort.

Posted 13-Mar-12 17:53pm

Dave Kreskowiak

Comments

Rajesh Yerramsetti 14-Mar-12 0:19am

Please Provide me with Example related to my requirement

Sergey Alexandrovich Kryukov 14-Mar-12 1:04am

Good point, a 5.
--SA

Solution 2

You can't sort a HashTable. If you could, it wouldn't be a HashTable. You can enumerate the HashTable, and then sort the enumeration. But that would be very slow. Recommendation would be to use .NET SortedDictionary instead.

Posted 13-Mar-12 17:54pm

Ganesan Senthilvel

Comments

Sergey Alexandrovich Kryukov 14-Mar-12 1:03am

Ha-ha, good point, a 5.
--SA

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Sudip Saha · Accepted Answer · 2012-03-13T18:39:00

Solution 3

Use Dictionary rather than Hash Table

XML

Dictionary<int, string> myDict = new Dictionary<int, string>();
myDict.Add(2, "This");
myDict.Add(1, "is");
myDict.Add(5, "radio");
myDict.Add(4, "clash");

List<string> song = new List<string>(myDict.Values);
song.Sort();

http://www.c-sharpcorner.com/uploadfile/prasoonk/hashtable-sorting/[^]

Posted 13-Mar-12 18:39pm

Sudip Saha

Updated 13-Mar-12 18:40pm

v2

Comments

Sergey Alexandrovich Kryukov 14-Mar-12 1:05am

Good advice, a 5. HashTable is rendered obsolete as per v.2.0, when generics were introduced.
But looks at the answers by Dave and Ganesan.
--SA

Rajesh Yerramsetti 14-Mar-12 1:23am

but i used the sorted list which is having inbuilt sorting functionality.is there any problem with sorted list

Dave Kreskowiak 14-Mar-12 10:28am

No, there's no problem with the Sort method.