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  • Scott Hugh Alexandar Petersen 349 posts 164 karma points
    Nov 30, 2009 @ 14:52
    Scott Hugh Alexandar Petersen
    0

    Usercontrol using codebehind file in app_code

    Hey there,

    I am trying to create a usercontrol with a label in it (this is quite easy).

    However in the Page_Load method I am trying to modify the label but it returns an error

    Object reference not set to an instance of an object.

    I have been trying to reference to it like this:

    Label lbl = (Label)Page.FindControl("lbl");
    lbl.Text = "modify";

    But it does not work, what am I doing wrong?

    Thanks

    Scott

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  • Scott Hugh Alexandar Petersen 349 posts 164 karma points
    Nov 30, 2009 @ 15:05
    Scott Hugh Alexandar Petersen
    0

    I found out myself (thanks to Rick Strahl: http://www.west-wind.com/Weblog/posts/5127.aspx):

    (Label)FindControlRecursive(this.Page.Master, "lbl");



     
      /// <summary>
      /// Finds a Control recursively. Note finds the first match and exists
      /// </summary>
      /// <param name="ContainerCtl"></param>
      /// <param name="IdToFind"></param>
      /// <returns></returns>
      public static Control FindControlRecursive(Control Root, string Id)
      {
       if (Root.ID == Id)
        return Root;
       foreach (Control Ctl in Root.Controls)
       {
        Control FoundCtl = FindControlRecursive(Ctl, Id);
        if (FoundCtl != null)
         return FoundCtl;
       }
       return null;
      }
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