Find a control dynamically added to a page

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In a content page i have added some linkbuttons. the number of linkbuttons varies depending on the data in the page. data is not in grid or any other data-controls.
i need to access the linkbutton which user clicks.
i used the following code ,

C#

int PageNumber = Convert.ToInt16(e.CommandArgument.ToString());
            string str = e.CommandName;
            LinkButton lbl = (LinkButton)FindControl(str);
            lbl.ForeColor = System.Drawing.Color.LightGreen;
            lbl.Font.Bold = true;

CommandName and id is also same.
CommandName is correctly received but the control could not be found.

Please suggest a solution

Posted 5-Sep-12 4:14am

sijo 2

Updated 5-Sep-12 18:50pm

D-Kishore

v2

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3 solutions

Solution 1

Control.FindControl[^] should do the trick for you. Dynamic controls should not matter.

Posted 5-Sep-12 4:17am

Abhinav S

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sijo 2 6-Sep-12 1:00am

Thanks Abhinav for your time

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Karthik. A · Accepted Answer · 2012-09-05T04:29:00

Where do you add the controls? to a place holder? I have given below a rough idea of how you could do this:

Add a place holder that will have the labels:

XML

<form id="form1" runat="server">
    <div>
        <asp:PlaceHolder ID="plcMain" runat="server">

        </asp:PlaceHolder>
        <asp:Label runat="server" ID="lblInfo"></asp:Label>
    </div>
    </form>

Code - behind:

C#

protected void Page_Load(object sender, EventArgs e)
{
    AddLinks();
}

private void AddLinks()
{
    for (int i=0;i<10;i++)
    {
        var linkButton = new LinkButton
                                    {
                                        ID = "lnkBtn" + i.ToString(),
                                        CommandArgument = i.ToString(),
                                        Text = "Link " + i.ToString()
                                    };
        linkButton.Click += new EventHandler(linkButton_Click);
        plcMain.Controls.Add(linkButton);
    }
}

protected void linkButton_Click(object sender, EventArgs e)
{
    var btn = sender as LinkButton;
    lblInfo.Text = "Link's command argument = " + btn.CommandArgument;
}

If you notice, you don't even need the FindControl method, just the linkButton_Click event handler. If you insist on using the FindControl method, you can do something like

C#

LinkButton control = plcMain.FindControl("lnkBtn1") as LinkButton; // Find "Link 1"
// Do something w/ "control"

In your case, you use the FindControl method on the page. Try a recursive FindControl if you don't wish to start the search with a certain control http://weblogs.asp.net/palermo4/archive/2007/04/13/recursive-findcontrol-t.aspx[^]

sijo 2 · Accepted Answer · 2012-09-05T18:49:00

Solution 3

ContentPlaceHolder contentPage = Master.FindControl("ContentPlaceHolder1") as ContentPlaceHolder;
            LinkButton lnkBtn = contentPage.FindControl("LinkButtonId") as LinkButton;
     if (lnkBtn!= null)  
     {  
     		//Do some action
     }

This worked correctly

Posted 5-Sep-12 18:49pm