asp.net event handler for dynamicallycreated button

Question

I have a button created in code behind like so:

some method {
    Button btnExportToExcel = new Button();
    btnExportToExcel.Text = "Export To Excel";
    btnExportToExcel.Click += new EventHandler(btnExportToExcel_Click);
    pnlListView.Controls.Add(btnExportToExcel);
}

protected void btnExportToExcel_Click(object sender, EventArgs e)
        {
            //do something
        }

The problem is that I can't ever get to execute the code from the event method.

Why is that?

When is Somethod called? Dinamic controls should be added in PreInit event — Oscar
– Oscar, Commented Feb 13, 2014 at 14:21

rt2800 · Accepted Answer · 2014-02-13 14:20:34Z

2

are you adding controls to page in preinit event handler? Check

answered Feb 13, 2014 at 14:20

rt2800

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3 Comments

sd_dracula Over a year ago

It is loaded in the Page_Load method and inside an if (!IsPostBack) statament

sd_dracula Over a year ago

Ok loading it in Pre_Init fixes the issue. Thank you.

sd_dracula Over a year ago

There is another small issue, what if I want to add the button control after other controls which get conditionally created? Meaning they might exist at pre_init

stillWindows7 · Accepted Answer · 2014-02-13 15:16:17Z

1

You must add the button to any controler .

 protected void Page_Load(object sender, EventArgs e)
    {
        Button btnExportToExcel = new Button();
        btnExportToExcel.Text = "Export To Excel";
        btnExportToExcel.Click += new EventHandler(btnExportToExcel_Click);
        //this is add the button to the form1
        this.form1.Controls.Add(btnExportToExcel);
    }

    void btnExportToExcel_Click(object sender, EventArgs e)
    {
        //...
        Response.Write("click me...");
    }

answered Feb 13, 2014 at 15:16

stillWindows7

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1 Comment

sd_dracula Over a year ago

Sorry I am adding it to a panel. Edited the code above.

Krishnraj Rana · Accepted Answer · 2014-02-13 14:24:30Z

0

Please add the dynamic controls in the Page's Init event handler so that the ViewState and Events are triggered appropriately.

answered Feb 13, 2014 at 14:24

Krishnraj Rana

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