I am using ASP C# on a web page and have an ASP dropdown list control. When select and change a different value in the dropdown list, my event is not firing.

I have used:

OnSelectedIndexChanged="ddlRoom_SelectedIndexChang ed"

in the ASPX page and this work, however I get a memory exception error when I close IE.

I have also tried:

this.ddlRoom.SelectedIndexChanged += new System.EventHandler(ddlRoom_SelectedIndexChanged);

private void ddlRoom_SelectedIndexChanged(object sender, System.EventArgs e)

but this is not firing. What is the proper way of programming an event for a dropdown list?

Thanks,

Paul

1. In the tag of the dropdownlist put Autopostback = "true" OnSelectedIndexChanged = "ddlRoom_SelectedIndexChanged"

2. Make sure you have the event handler subroutine (ddlRoom_SelectedIndexChanged) declared in your code

-.. -..

I am a new learner ,i don't know how to study ,can you help me ?

What do you need help with?

I have the following in the .cs file:

this.ddlRoom.SelectedIndexChanged += new System.EventHandler(ddlRoom_SelectedIndexChanged);

private void ddlRoom_SelectedIndexChanged(object sender, System.EventArgs e)
{
}

In my .ASPX file, in have:

<asp:dropdownlist id="ddlRoom" runat="server" AutoPostBack="True">

Note that I do not have the OnSelectedIndexChanged in the tag, and the method is private. This works. I am not sure why but it works.

Howevwer, I get and MS IE application error when I close IE and end the debug session in MS Visual Studio. This error only occurs when I select the dropdown list box and the event is fired.

iexplorer.exe - Application Error. The instruction at "0x10003e8d" referenced memory at "0x10003e8d". The memory could not be "read"

What could be going on?

Thanks,

Paul

You don't need the event in the tag. That looks right to me... The memory reference error may have nothing to do with your app; it may be an error with the browser. I get those sometimes.

Brian

Thanks for your help. It appears there is something going on behind the seens with MS IE, but I think the code is working to some agree.

Paul

Happens every now and then. It helps to have the most current browser also, even though that shouldn't be an issue.

Brian