DropDownList and TextBox

[E11esar]

Hi there.

In an Asp.Net (C#) page, I am assigning a

TextBox.Text to DropDownList.Se lectedItem.Text

and this all works fine within the SelectedIndexCh anged event of the dropDownList.

The problem I am looking for some feedback is where I want the first (top-most) item from the DropDownList, please?

I have tried a button_click event and a few other ideas but I can't see how to assign the top-most (position 0) value of the dropDownList to the TextBox. Even if I click the top item the event is not triggered so I am obviously missing something really simple here...

Any help please?

Thank you.

M :o)

[Frinavale]

It is pretty simple.
When you populate the DropDownList, and you're adding the first item to that list, add that item's text to the text box :)

[E11esar]

Hi there and thank you. I am currently populating the DropDownList with a DataReader and setting the datasource (databind) in that way.

I think my problem may be even simpler as I have just realised that the first value (index 0) is always being selected now, so I think my AutioPostBack is causing issues here as I am populating the DropDownList in the OnLoad event..!

So I guess the question now is which event is better here please?

Thank you.

M :o)

[E11esar]

One solution

Hi there.

I just found "one" way to make this work.

I have kept this in the PageLoad event but then enclosed my current logic within a

  if(!(Page.IsPostBack)){...}

and then at the point after the DropDownList is filled, I have inserted a dummy line at index 0 with:

   dropdDownList.Items.Insert(0, new ListItem("--Select Item--",""));

This is now behaving correctly.

Thank you.

M :o)

[Frinavale]

I haven't actually used DataBind with a DropDownList before.

I think the DropDownList should retain it's items between postbacks. You should only do have to populate it's items if it's the first time the page is being loaded (if IsPostBack = "false").

If this is not the case, only bind to this source in the PreRender event.

[E11esar]

Thank you for your help.

M :o)