Dynamically load user controls on button click, postback issue

Question

I'm trying to load usercontrols on button click, but problem is that, it disappears on postback inside user control.

this is how i load controls:

private bool IsUserControl
{
    get
    {
        if (ViewState["IsUserControl"] != null)
        {
            return (bool)ViewState["IsUserControl"];
        }
        else
        {
            return false;
        }
    }
    set
    {
        ViewState["IsUserControl"] = value;
    }
}


#region Usercontrols
private void CreateUserControlAllNews()
{
    Control featuredProduct = Page.LoadControl("path/usercontrol.ascx");
    plh1.Controls.Add(featuredProduct);
}

#endregion
protected void allNewsbtn_Click(object sender, EventArgs e)
{

    this.IsUserControl = true;
    if(IsUserControl)
    CreateUserControlAllNews();
}

Win · Accepted Answer · 2013-01-22 15:26:31Z

4

You need to reload the control when the page is post back. For example,

protected void Page_Load(object sender, EventArgs e)
{
    if (IsUserControl)
    {
        CreateUserControlAllNews();        
    }
}

private void CreateUserControlAllNews()
{
    Control featuredProduct = Page.LoadControl("path/usercontrol.ascx");
    featuredProduct.ID = "1234";
    plh1.Controls.Add(featuredProduct);
}

answered Jan 22, 2013 at 15:26

Win

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2 Comments

Mandragorasprout Over a year ago

thx for help. but the problem is that i have menu like linkbuttons and i want to load different usercontrols on each click. if i load controls on each postback, they will all stay on screen. sorry for my bad English, hope you'll understand my post.

Win Over a year ago

I answered similar question here stackoverflow.com/a/14449305/296861. If type of controls are mixed, you need to store SortedDictionary in ViewState instead of List<int>.

Community · Accepted Answer · 2017-05-23 10:34:57Z

1

OF course it disappears, every request creates a brand new instance of your page and if you dont re-create the control on that postback then it wont exist.

See the following links about this very common issue.

Singing eels

Another SO question

edited May 23, 2017 at 10:34

CommunityBot

11 silver badge

answered Jan 22, 2013 at 15:30

Richard Friend

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