LinkButton doesn't Postback on first click in asp.net?

Question

I have a .aspx Webpage with a UserControl added on it.In UserControl when the LinkButton is clicked it do not Postback on first attempt. but when we click again it does the Postback and then only the page redirects don't know why?

Any idea?

In .ASPX Markup:

 <asp:LinkButton ID="lnkCheckOut" runat="server" 
                        CssClass="button orange" onclick="lnkCheckOut_Click">Checkout</asp:LinkButton>

In.cs file:

protected void lnkCheckOut_Click(object sender, EventArgs e)
    {
        if (Session["UserID"] != null)
        {
            lnkCheckOut.PostBackUrl = "~/checkout.aspx?type=checkout";
            //Response.Redirect("~/checkout.aspx?type=checkout");
            Session["IsQuoteAdded"] = "false";
        }
        //if not logged in user
        else
        {
           lnkCheckOut.PostBackUrl = "~/login.aspx?returnUrl="+HttpUtility.UrlEncode(Request.RawUrl);
        }
    }

When i see markup in browser(using F12 in Chrome) on first click it shows:

<a id="ctl00_ContentPlaceHolder1_shpCart_lnkCheckOut" class="button orange" href="javascript:__doPostBack('ctl00$ContentPlaceHolder1$shpCart$lnkCheckOut','')">Checkout</a>

On Second Click:

<a id="ctl00_ContentPlaceHolder1_shpCart_lnkCheckOut" class="button orange" href='javascript:WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions("ctl00$ContentPlaceHolder1$shpCart$lnkCheckOut", "", false, "", "login.aspx?returnUrl=%2fNew%2fMyBox.aspx", false, true))'>Checkout</a>

Note:I am not using any UpdatePanel in the Webpage or UserControl.

Help Appreciated!

I can't be sure why it's happening,but an alternate way to this can be that you use __doPostback function in the onclick event of link button in javascript. — Neelam
– Neelam, Commented Oct 10, 2013 at 10:16
i had this kind of problem way back and this is the solution i used in the end when i couldn't find anything else.you will also need to add EnableEventValidation = false in your .aspx page.I'm not sure about the session validation.You should look to solve this,keep my suggestion as the last resort. — Neelam
– Neelam, Commented Oct 10, 2013 at 10:49

Avinash Jha · Accepted Answer · 2013-10-10 10:54:32Z

1

Your code is not redirecting the page it has just assigning the URL. Use below codes to rectify that.

protected void lnkCheckOut_Click(object sender, EventArgs e)
{
    if (Session["UserID"] != null)
    {
        //lnkCheckOut.PostBackUrl = "~/checkout.aspx?type=checkout";
       Session["IsQuoteAdded"] = "false";
        Response.Redirect(@"~/checkout.aspx?type=checkout");

    }
    //if not logged in user
    else
    {
       Response.Redirect(@"~/login.aspx?returnUrl="+HttpUtility.UrlEncode(Request.RawUrl));
    }
}

answered Oct 10, 2013 at 10:54

Avinash Jha

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1 Comment

SHEKHAR SHETE Over a year ago

hi @Avinash Jha, i have already mentioned in above comment that it wont work

pattermeister · Accepted Answer · 2013-10-10 10:29:54Z

0

In your markup, there is no PostBackUrl. So on the first click, it will actually post back to the same page, and your event handler will run.

Then, in your event handler, you are setting the PostBackUrl.

So the second time somebody clicks the link, it will post to that URL. Your code is working as designed :)

Edit: I would suggest changing to Response.Redirect, but it's hard to know exactly what your code is supposed to do.

edited Oct 10, 2013 at 10:29

answered Oct 10, 2013 at 10:24

pattermeister

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1 Comment

SHEKHAR SHETE Over a year ago

hi @pattermeister, so what is your recommendation to handle this situation? can we do this in aspx condition markp? any sample code help appreciated! also tried with Response.Redirect() but yet wont work so commented in posted code! anything else?

Appu · Accepted Answer · 2019-01-23 08:00:46Z

0

Same issue i was facing. I have link button in grid view. when i clicked the link button its not postback on first click ,but when i clicked again it does. Then i check my code properly and then i find that grid view is placed in update panel hence its not postback on first click.

So i would suggest please check the same.

answered Jan 23, 2019 at 8:00

Appu

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1 Comment

Vikrant Over a year ago

It's more likely a comment to other post

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