Question

I need to create a custom TextBox control that allows user input HTML tags. I added a new property called HtmlEnabled, default is false. If it is false, it will act exactly like the original TextBox; if it is set to true, it will call Server.HtmlEncode to encode the text. I never creat a custom control, can anyone tell me what do I need to do? What function I need to override? Thanks.

I created my TextBoxEx class as following: I still get the validation error when I set HtmlEnabled to true, can anybody tell me what is wrong?

namespace WebApplication1
{
    [ToolboxData("<{0}:TextBoxEx runat=server></{0}:TextBoxEx")]
    public class TextBoxEx : System.Web.UI.WebControls.TextBox
    {
        public bool HtmlEnabled
        {
            get
            {
                return (bool)ViewState["HtmlEnabled"];
            }
            set
            {
                ViewState["HtmlEnabled"] = value;
            }
        }

        public TextBoxEx()
        {
            ViewState["HtmlEnabled"] = false;
        }

        public override string Text
        {
            get
            {
                if (HtmlEnabled)
                    return HttpUtility.HtmlEncode(base.Text);
                else return base.Text;
            }

            set
            {
                if (HtmlEnabled)
                    base.Text = HttpUtility.HtmlDecode(value);
                else base.Text = value;
            }
        }


    }
}

Answer 1

Sounds like you could just inherit from the TextBox control and override the Text property. This article should get you started on how to go about doing it:

https://web.archive.org/web/20211020203142/https://www.4guysfromrolla.com/articles/100103-1.aspx