how to check which one has been clicked in asp.net - asp.net

Question

inside of while loop, i've used
<asp:Button ID="<%=objReader.Item(0)%>" OnClick="btn_Click" runat="server" CssClass="submit_button" Text="Delete" />
Sub btn_Click(ByVal sender As Object, ByVal e As EventArgs)
'You have clicked button
End Sub
to creating the button dynamically. Now, on click of particular button, it should show the information which are associated with the clicked button. Need Help !!
Solution
<asp:Repeater ID="Repeater1" runat="server" DataSourceID="Jobs">
<ItemTemplate>
<asp:Button ID="btnDemo" CommandArgument='<%#Eval("Login_id")%>' OnCommand="btnDemo_Click" runat="server" Text="Button" /></ItemTemplate>
</asp:Repeater>
Sub btnDemo_Click(ByVal sender As Object, ByVal e As CommandEventArgs)
MsgBox(e.CommandArgument)
End Sub
Thanks to every one!!

Answer 1

It's better to implement this in a databound control, like the repeater or listview.
You could then use the CommandArgument of a button to add some arguments which are distinct for each button.
You can then handle this in the Click procedure to handle the right action at the right CommandArgument.
see:
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.button.commandargument.aspx
Example:
<asp:Repeater runat="server" ID="rptList">
<ItemTemplate>
<asp:Button runat="server" ID="btnDemo" CommandArgument='<%#Eval("Id") %>' Text="Click me" OnCommand="btnDemo_Click" />
</ItemTemplate>
</asp:Repeater>