Re-Arrange the DropDownValues

Question

0.00/5 (No votes)

See more:

Hi ,

EveryOne

I have a DropDownList ,On a Delete button click the numbers from the dropdown get deleted and and on Add Button click numbers are added to the dropdown.

Now if have 1, 2, 3 in my dropdown and if I delete 1, I want the number 2 and 3 to be replaced by 1 and 2. I am not sure how to do this. Can someone please help me?

Posted 6-Aug-12 1:23am

pranathis012

Updated 6-Aug-12 1:27am

Vani Kulkarni

v2

Add a Solution

Comments

OriginalGriff 6-Aug-12 7:32am

The question is: Why?
Think about it from the POV of the user: he just pressed the delete key to get rid of number 1 and 3 vanished instead! I want 3 back, and 1 to go! Should I delete 1 again? Does it matter, What happened to 3 anyway?

It's visually confusing - what are you trying to achieve that you think this is a good idea?

[no name] 6-Aug-12 7:38am

My dropdown values are like this 1,2,3,4..
if i delete 2 ,then my dropdown values are like this 1,3,4.....Once observe this numbering formate is not in proper way ,so i want to rearrange the num's like this 1,2,3...How to do this plz give any suggestion.

OriginalGriff 6-Aug-12 7:42am

Yes - exactly.
Think about it.
Your drop down list has 1, 2 and 3.
You select 2, and press delete. 2 is still there. What are you going to do now? Answer: press delete again, and get annoyed.
Either don't renumber them, so the user can see that his input has had an effect, or don't use numbers at all. Use something that means something to the user, and reflects what he is doing as a task rather than arbitrary numbers.

[no name] 6-Aug-12 8:01am

yes ur correct,

but my requirement is like that only that's way i do that format..
could u expalin it in example plz

Vani Kulkarni 6-Aug-12 7:39am

True. No user would like such a confusing solution.

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

_Amy · Answer 1 · 2012-08-06T01:43:00

Solution 2

Hi,
First get the datasouce of your dropdownlist, sort it and set the datasouce again to the dropdownlist.
Try this:

C#

DataTable dt = (DataTable)DropDownList1.DataSource;
//Sort your datatable here.
dt.DefaultView.Sort = "Parameter_Name ASC";
dt = dt.DefaultView.ToTable();
DropDownList1.DataSource = dt;
DropDownList1.DataTextField = "Description";
DropDownList1.DataValueField = "Code";
DropDownList1.DataBind();

--Amit

Posted 6-Aug-12 1:43am

_Amy

Updated 6-Aug-12 1:45am

v2

Comments

[no name] 6-Aug-12 7:55am

I do like this in my DataBound event

DataTable dt = ViewState["x"] as DataTable;

DataView dv = dt.DefaultView;

dv.RowFilter = "Type=2";

DropDownList ddlSort = (DropDownList)e.Row.Cells[2].FindControl("ddlSort");

ddlSort.DataSource = dv;

ddlSort.DataTextField = "Sort";
ddlSort.DataValueField = "Sort";

_Amy 6-Aug-12 7:59am

Try my answer. Update the column first.
In this answer DataTextField and DataValueField both are same... Little confusing...

Unareshraju · Answer 2 · 2012-08-06T01:37:00

Solution 1

pls see here:
http://www.eggheadcafe.com/community/csharp/2/10091141/remove-selected-items-from-dropdownlist.aspx[^]

Posted 6-Aug-12 1:37am

Unareshraju

Comments

[no name] 6-Aug-12 7:56am

In that i'm not getting my requirement exactly could u plz expalin it in any example

Unareshraju 6-Aug-12 8:39am

first u have to add some items.
after that in delete button write like this
private void BtnDelete_Click(object sender, RoutedEventArgs e)
{
comboBox1.Items.Remove(comboBox1.SelectedItem);
}

[no name] 6-Aug-12 23:40pm

for Deleting purpose i wrote SP

Unareshraju 7-Aug-12 0:33am

No need ,because of dropdown list items did not come from database right?