Which button has raised onclick even?

I have created 3 LinkButton they all have same onclick event, now I have to find which button has called onclick event and it’s ID

<asp:LinkButton ID="LinkButton1" runat="server" onclick="lnk_Click"开发者_如何学编程/> 
<asp:LinkButton ID="LinkButton2" runat="server" onclick="lnk_Click"/> 
<asp:LinkButton ID="LinkButton3" runat="server" onclick="lnk_Click"/> 

From the sender object of course:

LinkButton btn = (LinkButton)sender;

btn.ID

protected void MyBtnHandler(Object sender, EventArgs e)
{
     LinkButton btn = (LinkButton)sender;
          switch (btn.CommandName)
          {
                case "ThisBtnClick":
                    DoWhatever(btn.CommandArgument.ToString());
                    break;
                case "ThatBtnClick":
                    DoSomethingElse(btn.CommandArgument.ToString());
                    break;
           }
}

You're function should have a "sender" object.

void lnk_Click(object sender, EventArgs e)
{
    LinkButton btn = sender as LinkButton;

    if (btn != null)
    {
        String id = btn.ID;
        //etc
    }
}

Cast the sender to LinkButton, from there you can get the id of the button that was clicked.

LinkButton lb = (LinkButton)sender;
string ID = lb.ID; //the id of the button that was clicked

You can do

LinkButton lb = sender as LinkButton;

and then access it's properties. However, if your logic differs enough it may be good practice to seperate out into more than one handler.