add a button click event dynamically in asp.net 4.5 c#

Question

I have some questions to this post [1]: How can i create dynamic button click event on dynamic button?

The solution is not working for me, I created dynamically an Button, which is inside in an asp:table controller.

I have try to save my dynamic elements in an Session, and allocate the Session value to the object in the Page_Load, but this is not working.

Some ideas

edit:

        ...
        Button button = new Button();
        button.ID = "BtnTag";
        button.Text = "Tag generieren";
        button.Click += button_TagGenerieren;

        tabellenZelle.Controls.Add(button);
        Session["table"] = table;
    }

    public void button_TagGenerieren(object sender, EventArgs e)
    {
        TableRowCollection tabellenZeilen = qvTabelle.Rows;
        for (int i = 0; i < tabellenZeilen.Count; i++)
        {
            ...
        }
    }

  protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {

            if (Session["table"] != null)
            {
                table = (Table) Session["table"];
                Session["table"] = null;
             }
        }
    }

I have a asp:panel which is show in the detail of an "dataset", and the fill the data dynamically with an event — Higune, May 15 '13 at 13:44
I don't think you need to use the Session at all... if you change the control structure of the page, it will persist automatically. — qJake, May 15 '13 at 13:45
the funny point is, the Session allocate the right data, but this is not shown on the surface — Higune, May 15 '13 at 13:46
http://stackoverflow.com/q/10387856/875454 This might help others out too — Solid1Snake1, Jan 09 '15 at 22:19

score 1 · Accepted Answer · edited May 23 '17 at 10:28

It is not a good practice to store every control into Session state.

Only problem I found is you need to reload the controls with same Id, when the page is posted back to server. Otherwise, those controls will be null.

<asp:PlaceHolder runat="server" ID="PlaceHolder1" />
<asp:Label runat="server" ID="Label1"/>

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

private void LoadControls()
{
    var button = new Button {ID = "BtnTag", Text = "Tag generieren"};
    button.Click += button_Click;
    PlaceHolder1.Controls.Add(button);
}

private void button_Click(object sender, EventArgs e)
{
    Label1.Text = "BtnTag button is clicked";
}

Note: If you do not know the button's id (which is generated dynamically at run time), you want to save those ids in ViewState like this - https://stackoverflow.com/a/14449305/296861

score 0 · Answer 2 · answered May 15 '13 at 14:23

0

The problem lies in the moment at which te button and it's event are created in the pagelifecycle. Try the page_init event for this.

answered May 15 '13 at 14:23

Raimond Kuipers

1,146
10
18

score 0 · Answer 3 · answered Feb 13 '14 at 10:26

Create Button in page load

            Button btn = new Button();
            btn.Text = "Dynamic";
            btn.Click += new EventHandler(btnClick);
            PlaceHolder1.Controls.Add(btn)

Button Click Event

protected void btnClick(object sender, EventArgs e)
{
  // Coding to click event
}

add a button click event dynamically in asp.net 4.5 c#

edit:

3 Answers3