Two Buttons updating one item of a listview - asp.net

Question

I have two buttons in a ListView. With a click on the first Button I want to update the ListView-Item. With a click on the second button i want to update the ListView-Item and redirect to a different page. Both Buttons have a property CommandName="Update". I wanted to solve my problem with the CommandArgument-Property and the OnItemUpdated-Event, but I do not know how to get the value of this Property in the event.
<asp:ObjectDataSource ID="ods" runat="server" SelectMethod="Select" UpdateMethod="Update">
<SelectParameters>
<asp:Parameter ..... />
</SelectParameters>
<UpdateParameters>
<asp:Parameters .... />
</UpdateParameters>
</asp:ObjectDataSource>
<asp:ListView ID="lv" runat="server" DataSourceID="ods" DataKeyNames="ID" OnItemUpdated="lv_OnItemUpdated">
<ItemTemplate>...</ItemTemplate>
<EditItemTemplate>
<asp:Button ID="btnUpdate" runat="server" CommandName="Update"/>
<asp:Button ID="btnUpdate2" runat="server" CommandName="Update"/>
</EditItemTemplate>
</asp:ListView>
And in codebehind:
protected void lv_OnItemUpdated(object sender, ListViewUpdateEventArgs e)
{
...
}
Is it possible to decide in lv_OnItemUpdated which Button the user clicked?

Answer 1

I don't believe there is a way to distinguish which control issued the Update command, since sender is the ListView itself.
A workaround would be for you to give one button the CommandName "Update", and the other "UpdateRedirect".
The "UpdateRedirect" button will fire the ListView_ItemCommand event, and from there you can call ListView.UpdateItem, keeping your updating logic in there, and then redirect next.
Why do you insist on using the OnItemUpdated event?

Answer 2

Well there are 2 to 3 ways of doing it: One is of CommandArgument as:
<asp:Button id="Button1"
Text="Sort Ascending"
CommandName="Sort"
CommandArgument="Ascending"
OnCommand="CommandBtn_Click"
runat="server"/>
<asp:Button id="Button2"
Text="Sort Descending"
CommandName="Sort"
CommandArgument="Descending"
OnCommand="CommandBtn_Click"
runat="server"/>
and than on server side you can have:
void CommandBtn_Click(Object sender, CommandEventArgs e)
{
if(e.CommandName == "Sort")
//do you work and so on
}
or you can cast the sender as button and take it ID to see, which button was it:
((Button)sender)).ID
or you can get button ID as:
String ButtonID = Request["__EVENTTARGET"];
I hope it will help you in fixing your problem.
so you can have like:
protected void lv_OnItemUpdated(object sender, ListViewUpdateEventArgs e)
{
// either use e.CommandName
// or user ((Button)sender)).ID
}

Answer 3

Give each button a distinct name. Have the same event handling method in your code behind handle both button click events. Then check which button called the method.
EDIT: A workaround would be to use javascript to put the name of the clicked button into a hidden field on the form BEFORE it goes server side (using a client side script). Then in your Listview you could check the value of the hidden field to see which button was clicked.

Answer 4

Ok, yes, the itemcommand is what you want:
The lifecycle for an update or insert triggers both their native events AND the itemcommand event. The itemCommand event will occur prior to the itemUpdating or the itemInserting events.
So, you can create a boolean variable called called "bSecondButtonClicked" for example Add the command argument to both buttons with the Commandname='UPDATE". the e.command argument can be evaluated at the itemcommand event point. There set your Boolean variable (or however you implement it) to true. Then, at the itemupdating event, trigger your code based on the bSecondButtonClicked.

Answer 5

You need to get into the ItemCommand event of your ListView
protected void lstvw_ItemCommand(object sender, ListViewCommandEventArgs e)
{
switch (e.CommandName)
{
case "new":
try
{
//e.CommandArgument
//e.CommandSource
// do your stuff here
}
catch (Exception ex)
{
}
break;
default:
break;
}
}