Dynamically adding a commandbutton in ASP.NET - asp.net

Question

I have a page with a dynamically created command button.
I need to dynamically wire up a click event so I can grab the CommandArgument of the clicked button.
Button b = new Button();
b.ID = "btnTrigger2";
b.CssClass = "hiddenBtn";
b.CommandName = "lbl3";
b.Click += new EventHandler(btnTrigger_Click);
The problem is the last line - I can't wire up an EventHandler this way - I need to use the standard EventArgs instead of CommandEventArgs.
Anyone have any suggestions on getting this to work? There's got to be a way...
EDIT
Figured I'd post the code that finally worked in case anyone else tries to do the same thing.
`string tabLoadedScript = string.Empty;
string postBackScript = string.Empty;
string script = " <script language='javascript' type='text/javascript'>" + System.Environment.NewLine;
script += "function clientActiveTabChanged(sender, args) {" + System.Environment.NewLine;
int i = 0;
foreach(TabPanel tp in tc1.Tabs)
{
Button b = new Button();
b.ID = "btn" + tp.ClientID;
b.CssClass = "hiddenBtn";
b.CommandName = tp.ID;
b.Command += btnTrigger_Click;
this.form1.Controls.Add(b);
AsyncPostBackTrigger trg = new AsyncPostBackTrigger();
trg.ControlID = "btn" + tp.ClientID;
tabLoadedScript += "var isTab" + tp.ClientID + "loaded=$get('" + tp.Controls[0].ClientID + "');" + System.Environment.NewLine;
postBackScript += "if(!isTab" + tp.ClientID + "loaded && sender.get_activeTabIndex() == " + i + ") {" + System.Environment.NewLine;
postBackScript += "__doPostBack('" + b.ClientID + "','');}" + System.Environment.NewLine;
i++;
}
script += tabLoadedScript;
script += postBackScript;
script += "}" + System.Environment.NewLine;
script += "</script>";
this.ClientScript.RegisterClientScriptBlock(this.GetType(), "cs", script, false);
protected void btnTrigger_Click(object sender, CommandEventArgs e)
{
System.Threading.Thread.Sleep(2500);
Panel ctrl = (Panel) FindControlRecursive(this, "pnl" + e.CommandName);
ctrl.Visible = true;
}
public static Control FindControlRecursive(Control Root, string Id)
{
if(Root.ID == Id)
return Root;
foreach(Control Ctl in Root.Controls)
{
Control FoundCtl = FindControlRecursive(Ctl, Id);
if(FoundCtl != null)
return FoundCtl;
}
return null;
}
`

Answer 1

You can still access the CommandArgument using the the first argument passed to the click handler.
Something like:
protected void btnTrigger_Click(object sender, EventArgs e)
{
Button btnTrigger = sender as Button;
String commandArgument = btnTrigger.CommandArgument;
.
.
.
.
//Other code....
}

Answer 2

You need to use the Command event instead of the Click event. Also, assuming you're using a recent version of Visual Studio and .Net, you can simply change the event registration from
b.Click += new EventHandler(btnTrigger_Click);
to
b.Command += btnTrigger_Click
The explicit typing of the delegate is redundant and will be inferred by the compiler. You can now change the signature of your event handler to:
protected void btnTrigger_Click(object sender, CommandEventArgs e)
And the code should work as desired.
Unfortunately, the default code snippets in Visual Studio still generate this old-style event listener code.