Disable Postback on button ASP NET c

Question

Here's an illustration of what I'm talking about.

Page Load
{
   //Adds items to a panel (not an updatepanel just a normal panel control)
}

 protected void btnNexMod_Click(object sender, EventArgs e)
{

   // Calls DoWork() and Appends more items to the same panel
}

My issue is that the asp:button performs a postback in addition to calling DoWork ()

As a result, I'm reloading my page and re-initializing my panel:(

I'd like the items I've added on the panel to remain there!

All assistance is very welcomed; but, I am not asking for someone to deliver you the solution. Thank you for taking any measures!

Here's a specific example of my issue.

protected void Page_Load(object sender, EventArgs e)
{

    CheckBox chkbox = new CheckBox();
    chkbox.Text = "hey";
    chkbox.ID = "chk" + "hey";

    // Add our checkbox to the panel
    Panel1.Controls.Add(chkbox);
}
protected void Button1_Click(object sender, EventArgs e)
{
    CheckBox chkbox = new CheckBox();
    chkbox.Text = "hey";
    chkbox.ID = "chk" + "hey";

    // Add our checkbox to the panel
    Panel1.Controls.Add(chkbox);
}

Only an empty panel and a button with this click even handler are visible on the website.

I've tried this as well, and it still doesn't work. It's now removing the first item that was added to the panel.

if (!Page.IsPostBack) // to avoid reloading your control on postback
{

    CheckBox chkbox = new CheckBox();
    chkbox.Text = "Initial";
    chkbox.ID = "chk" + "Initial";

    // Add our checkbox to the panel
    Panel1.Controls.Add(chkbox);
}

Answer 1

If you're dynamically adding controls to the Panel, you'll need to recreate them at each postback and ensure that the controls have the same IDs so that ViewState can populate the data. In most cases, it's ideal to rebuild dynamic material on OnInit, although this can be challenging in particular cases.

The DynamicControlsPlaceHolder is one of my favourite tools since you can add dynamic controls to it and it will persist them automatically without any further coding on the page. All you have to do now is add controls to it, and it will take care of the rest.

Here's how to get there:
http://www.denisbauer.com/Home/DynamicControlsPlaceholder

Use OnClientClick and return false to prevent your button from executing a postback.

OnClientClick="return false;"