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Sort Method for an ASP.NET DropDownList

, 28 Sep 2003
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This code will show you how to implement a sort feature on an ASP.NET DropDownList control.

Introduction

I recently found a requirement in my ASP.NET application that needed to be able to sort a DropDownList control. Oddly enough I couldn't find a sort method within the framework, so I made my own. The code below shows what I did as a quick option, but you can of course use similar code to create a custom control that inherits from the DropDownList control.

Code

    Private Sub SortDropDown(ByVal dd As DropDownList)
        Dim ar As ListItem()
        Dim i As Long = 0
        For Each li As ListItem In dd.Items
            ReDim Preserve ar(i)
            ar(i) = li
            i += 1
        Next
        Dim ar1 As Array = ar

        ar1.Sort(ar1, New ListItemComparer)
        dd.Items.Clear()
        dd.Items.AddRange(ar1)
    End Sub
    Private Class ListItemComparer _
        Implements IComparer
        
        Public Function Compare(ByVal x As Object, _
              ByVal y As Object) As Integer _
              Implements System.Collections.IComparer.Compare
            Dim a As ListItem = x
            Dim b As ListItem = y
            Dim c As New CaseInsensitiveComparer
            Return c.Compare(a.Text, b.Text)
        End Function
    End Class

Summary

As I mentioned, this can easily be put into a custom control by simply creating a new class. Inherit from the DropDownList control and add the above code to the class. That's all. When you create your ASP.NET web form, you can drag and drop a normal DropDownList to your form, and edit the declaration in your code behind form, to use your custom class. Enjoy!

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

Domenic
Web Developer
United States United States
I've been writing software applications since the early 90's from ASP and VB5 to C# and ASP.NET. I am currently working on law enforcement and criminal justice applications delivered over the web. I've always been astounded by the fact that the only 2 industries that refer to customers as "users" are narcotics and software development. Wink | ;-)

Comments and Discussions

 
GeneralMy vote of 4 PinmemberRogerFraser17-Jul-13 20:38 
GeneralDropDown List Selected Index Change Problem Pinmemberjahirhstu29-Aug-09 4:49 
GeneralPreserve VALUE while sorting Pinmemberprouhiaw@guerrillamailblock.com30-Jul-09 0:18 
GeneralThanks! Pinmemberdsilk3-Jul-08 10:52 
GeneralError Pinmemberhalliej2x1-Aug-06 21:45 
GeneralRe: Error PinmemberDomenic2-Aug-06 2:27 
GeneralRe: Error Pinmemberhalliej2x2-Aug-06 19:16 
GeneralRe: Error PinmemberDomenic3-Aug-06 9:41 
QuestionRe: Error PinmemberGregorio Cybill11-Aug-08 17:58 
GeneralRe: Error PinmemberMohammed Aziz Elnahrawi5-Oct-06 20:31 
GeneralShortcut using CopyTo method on prealloced array Pinmemberhafthor27-Feb-06 5:22 
GeneralRe: Shortcut using CopyTo method on prealloced array PinmemberLouvaras4-Feb-09 3:43 
GeneralGood code, but let's make it even better PinmemberHamidTheProgrammer9-Aug-05 10:34 
GeneralRe: Good code, but let's make it even better PinmemberDomenic10-Aug-05 2:08 
GeneralWould just like to say... PinsussAnonymous4-Aug-05 0:51 
GeneralRe: Would just like to say... PinmemberDomenic4-Aug-05 2:18 
GeneralSyntax error Pinmemberchatelainj1-Sep-04 8:41 
GeneralRe: Syntax error PinsussAnonymous3-May-05 8:21 
Generalc# version wrapped in a SortableDropDownList PinmemberSteinar Herland2-Apr-04 22:57 
GeneralRe: c# version wrapped in a SortableDropDownList PinmemberPaul Rogan10-Jan-06 0:32 
GeneralRe: c# version wrapped in a SortableDropDownList Pinmemberbanditking20-Apr-06 4:41 
GeneralRe: c# version wrapped in a SortableDropDownList PinmemberRyan McFarren14-Jul-06 6:25 
GeneralRe: c# version wrapped in a SortableDropDownList Pinmemberashushere8-Jun-07 11:56 
GeneralRe: c# version wrapped in a SortableDropDownList Pinmemberruileier18-Sep-07 21:15 
Questionhello!?? Pinsussnoahart24-Feb-04 22:05 
AnswerRe: hello!?? PinsussAnonymous4-Aug-05 0:45 

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