Linkbutton OnClick event incorrectly firing on page load

Question

My click events are firing on linkbuttons on page load, before the link has been clicked, any ideas? (This is in a Visual web-part hosted in SP2010)

This is my code:

<asp:LinkButton ID="LinkButtonA"  PostBackUrl="<%#Request.Url.AbsoluteUri %>" runat="server" OnClick="Letter_Click" CommandArgument="A">A</asp:LinkButton>


 protected void Letter_Click(object sender, EventArgs e)
        {
            if (IsPostBack)
            {
                Label1.Text = ((LinkButton)sender).CommandArgument;
             }
        }

Label1 is having its text set to 'A' on page load.

Answer 1

Tried your code and works fine: No 'A' in Label on load, and 'A' appers after click. Maybe you can give more info?

And you can try setting some labels text property value with javascript - no need to do any postback to server.

Answer 2

The issue seemed to be I was previewing the webpart!? When I added it to a page the events seemed to work correctly.

Answer 3

Are you sure the initial text of the label is empty? It might be the viewstate playing up.

protected void Page_Load(object sender, EventArgs e) {
    if (!IsPostBack) {
        Label1.Text = "";
    }
}

protected void Letter_Click(object sender, EventArgs e) {   
    Label1.Text = ((LinkButton)sender).CommandArgument;
}