How to add controls dynamically when click button in asp.net?

Question

I\'m trying to add controls dynamically

Code:

AddVisaControl.ascx

<%@ Control Language=\"C#\" AutoEventWireup=\"true\" CodeBehind=\"AddVi         


        

Answer 1

if you remove the static 'i' variable and use a hidenInput to maintain the no of created controls (or a session value) you will be fine.

But I suggest you read the following article to find a better way of creating dynamic controls :

Dynamic control creation in ASP.NET

Answer 2

I will show one examples you can try it your own way

An idea would be to create a list of buttons in which you'd store the buttons you created inbtnCreateDynamic_click

you could have a method like:

private Button CreateButton(string id, string name)
        {
            Button b = new Button();
            b.Text = name;
            b.ID = id;
            b.Click += new EventHandler(Button_Click);
            b.OnClientClick = "ButtonClick('" + b.ClientID + "')";
            return b;
        }

in btnCreateDynamic_click you could have something like:

Button b = CreateButton("dinamicBtn"+myDinamicButtonsList.Count.ToString(),"dinamicBtn"+myDinamicButtonsList.Count.ToString());
myDinamicButtonsList.add(b);
and in the pageLoad for example you could do something like

foreach(button btn in myDinamicButtonsList){
    form1.Controls.Add(btn));
}

List<Button> myDinamicButtonsList = new List<Button>();

myDinamicButtonsList should be stored somewhere from where it could be retrieved after each request.

EDIT: In page load you could have something like this:

if(Session["myDinamicButtons"] == null){
    List<Button> myDinamicButtonsList = new List<Button>();
    Session["myDinamicButtons"] = myDinamicButtonsList;
}

foreach(Button btn in Session["myDinamicButtons"] as List<Button>){
    form1.Controls.Add(btn));
}

i didn't tested it but it should work.

also put on some information following may more help..

Your button click event at the client will cause a page postback that will start the ASP.Net Page Life-cycle.

Your button click event on the server is a PostBackEvent and you should be able to use the same method call CreateMyButton() that you used in the Load or Init events.

Answer 3

Remove static int i = 0;

Change the method as below

  protected void addnewtext_Click(object sender, EventArgs e)
    {     

            AddVisaControl ac = (AddVisaControl)Page.LoadControl("AddVisaControl.ascx");
            PlaceHolder1.Controls.Add(ac);
            PlaceHolder1.Controls.Add(new LiteralControl("<BR>"));

    }