CODEWITHSUNDEEP
c#.netasp.netdrop-down-menu
Sumeru Suresh
Sumeru Suresh

Reputation: 3181

Adding a new value to the drop down list box

I have a drop down list box which has one of the values to be others. I want to move these value to the last. Please help me with this. The code i am using is as follows

ddlAssetsCountryOthersone.DataSource = lstIMAssetsByCountryOthers;
ddlAssetsCountryOthersone.DataTextField = "AssetDescription";
ddlAssetsCountryOthersone.DataValueField = "AssetDescription";
ddlAssetsCountryOthersone.DataBind();
ddlAssetsCountryOthersone.Items.Remove(
             ddlAssetsCountryOthersone.Items.FindByValue(
                Constants.PhilosophyAndEmphasis.Other.ToString()));

How can i add the others back to the drop down list in the last

Upvotes: 4

Views: 45172

Answers (5)

Jason Berkan
Jason Berkan

Reputation: 8884

When databinding, it is far easier to add/remove items from the list that is being databound than it is to add/remove items after the data binding takes place.

I would create a wrapper around lstIMAssetsByCountryOthers that makes the necessary changes into a new IEnumberable and returns that new object to be databound.

Upvotes: 0

JohnIdol
JohnIdol

Reputation: 50087

If you the dropdownlist is databound you will not be able to add items to your control after the DataBind() call, and if you add them before they will be cleared anyway whe you call DataBind().

You can use Insert or Add after the data binding takes place, and you can specify the index of the item you're inserting. Insert is used to insert at the specific location, Add will append to the bottom, as in your case:

//after databind

//example with insert - (-1 as list is zero based)
ddlMyList.Items.Insert(noOfItems-1, "Other");

OR

//add
ddlMyList.Items.Add("Other");

Upvotes: 1

Muhammad Akhtar
Muhammad Akhtar

Reputation: 52241

you can try like

ListItem li = new ListItem("text", "value");
    yourDropdown.Items.Insert(yourDropdown.Items.Count, li);

If you have 5 items in dropdown, it will return 5, since the insert index start from 0

Upvotes: 1

Mike Kingscott
Mike Kingscott

Reputation: 477

Or:

ListItem li = ddlAssetsCountryOthersone.FindByValue(Constants.PhilosophyAndEmphasis.Other.ToString()));
ddlAssetsCountryOthersone.Remove(li);
ddlAssetsCountryOthersone.Add(li);

That should work, please test - and replace Add with Insert as per JohnIdol's suggestion...

Upvotes: 0

Canavar
Canavar

Reputation: 48088

try this after your databind : 

ddlAssetsCountryOthersone.Items.Add(new ListItem("Others", "Others"));

By the way if you use Insert method, you can insert the item you want to the position you want. For example the code below adds the Other option to the 4th order : 

ddlAssetsCountryOthersone.Items.Insert(4, new ListItem("Others", "Others"));

Upvotes: 7

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