ASP.NET

4-Feb-10 22:03

Hi
I have a link button which is part of my user control. Further, the control is actually added to the control dynamically. Whilst, I can see the control, and is added to the page without any visible errors, but when I click on to fire an event which on that user control nothing happens. What is even more odd, if I add a break point to event, and then click in debug mode, I can't even reach the break point!

To try and resolve this, I have tried giving the link button ids, and ensured they unique, added override using OnInit and used the createchildcontrols method, but nothing seems to work!

Has anyone came across and if so, can give me a solution?

Rhys Jacob4-Feb-10 22:26

4-Feb-10 22:26

Where in the code is the linkbutton created dynamically? Put a breakpoint on page_load and you should see that this is hit when you click the linkbutton. It doesn't fire the event because the control is not recreated again as part of the postback.

Try recreating the control in page_load if isPostBack = true. Remember to recreate your event handler here as well.

AndyASPVB4-Feb-10 22:41

4-Feb-10 22:41

Hi
I had already done all of this.

The linkbutton is created on the usercontrol form.

I have added the linkbutton creation to, with this.linkbutton1.click += EventHandler(this.linkbutton1_click); to Page_Load, OnInit, Page_PreRender and CreateChildControls.

The event will not fire even after doing all of this!

Rhys Jacob4-Feb-10 22:45

4-Feb-10 22:45

Could you post the code behind please?

Ravindra Nidhonkar5-Feb-10 0:37

Ravindra Nidhonkar

5-Feb-10 0:37

As you said the Link button is created Dynamically, you have to create it Every Time when the page is post back, also create it in the Init event of the user control.

AndyASPVB5-Feb-10 0:53

5-Feb-10 0:53

Here is the user control with the link button on it!

public partial class ucCustomerDetails : System.Web.UI.UserControl
{

protected override void CreateChildControls( )
{
base.CreateChildControls( );

this.lnkShowAllCust.ID = "lnkShowAllCust";
this.lnkShowAllCust.Click += new EventHandler(this.lnkShowAllCust_Click);
this.Controls.Add(lnkShowAllCust);
}

protected override void OnInit (EventArgs e)
{
CreateChildControls( );
base.OnInit(e);
}

protected override void OnLoad(EventArgs e)
{
base.EnsureChildControls( );
}

protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack)
{
CreateChildControls( );
}
}

protected void lnkShowAllCust_Click(object sender, EventArgs e)
{
this.OnCustShowAllClicked(new EventArgs ( ));
}

protected virtual void OnCustShowAllClicked(EventArgs args)
{
if (this.ViewAllClicked != null)
{
this.ViewAllClicked(this, args);
}
}

public event EventHandler ViewAllClicked;

}

I have deleted other stuff that is on it, but these other controls have nothing to do with the link button

AndyASPVB5-Feb-10 0:52

5-Feb-10 0:52

Ravindra Nidhonkar5-Feb-10 1:04

Ravindra Nidhonkar

5-Feb-10 1:04

Try following code:

protected override void OnInit(EventArgs e)
        {
            base.OnInit(e);
            LinkButton lnk = new LinkButton();
            lnk.Text = "My Link";
            lnk.Click += new EventHandler(lnk_Click);
            plcHld.Controls.Add(lnk);
        }

        void lnk_Click(object sender, EventArgs e)
        {
            lblMessage.Text = "Link Clicked";
        }

AndyASPVB5-Feb-10 1:31

5-Feb-10 1:31

I have tried this, and still no luck.

One thing I did omit to mention is that I have an AJAX control on the ASPX page that encompasses the whole user control. All this does is to refresh the page every 5 mins.

I commented this AJAX control out, added a break point to the link button event, and all that happened was the java script fired, but it didn't reach the break point.

Rhys Jacob5-Feb-10 1:57

5-Feb-10 1:57

This is a simple example of recreating your control on postback. So assuming that works and you still have the problem: is there any validation on the front end? Could it be that the form isn't valid so you don't get the postback?

public partial class WebUserControl1 : System.Web.UI.UserControl
    {
        static int x = 0;
        protected void Page_Load(object sender, EventArgs e)
        {
            if (IsPostBack)
            {
                if (ViewState["x"] != null)
                {
                    CreateLB();
                }
            }
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            CreateLB();
        }

        private void CreateLB()
        {
            LinkButton lb = new LinkButton();
            lb.Text = "click me";
            lb.Click += new EventHandler(lb_Click);
            this.Controls.Add(lb);
            ViewState["x"] = true;
        }

        void lb_Click(object sender, EventArgs e)
        {
            x += 1;
            Label1.Text = x.ToString();
        }
    }

front end:

<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>

AndyASPVB5-Feb-10 2:30

5-Feb-10 2:30

Hi
There is no form validation at all on the page.

The only other thing I have is an AJAX Control, which refreshes the page every 5 mins.

I will try your code, and see how I get on!

AndyASPVB5-Feb-10 3:33

5-Feb-10 3:33

Hi
I have tried your code, and nothing happened.

However, as part of my debugging and trying to get to grips with this, I added a break point to the page_load method and ran again.

The page_load method didn't get hit, I even then moved the code from there to OnLoad, and it did get hit, but inside the if statement for the viewstate, it skipped over the CreateLB() method!

Any thoughts?

Rhys Jacob5-Feb-10 5:47

5-Feb-10 5:47

Have you wired up the button on the front page to hit right method:

protected void Button1_Click(object sender, EventArgs e)        
{            
   CreateLB();        
}

The idea is, you click the button on the form, this dynamically creates the linkbutton, then when you click the linkbutton it stays there and is recreated on postback every time you click it.

AndyASPVB5-Feb-10 5:57