Question

i use such code, but it renders with error <li class="dd0"><div id="dt1"<a href="http://localhost:1675/Category/29-books.aspx">Books</a></div></li>

there is no > in opening tag div. what the problem?

writer.WriteBeginTag("li");
                //writer.WriteAttribute("class", this.CssClass);
                writer.WriteAttribute("class", "dd0");
                if (!String.IsNullOrEmpty(this.LiLeftMargin))
                {
                    writer.WriteAttribute("style", string.Format("margin-left: {0}px", this.LiLeftMargin));
                }
                writer.Write(HtmlTextWriter.TagRightChar);
                writer.WriteBeginTag("div");
                writer.WriteAttribute("id", "dt1");
                this.HyperLink.RenderControl(writer);
                writer.WriteEndTag("div");
                writer.WriteEndTag("li");

Answer 1

You dont need to use writer.Write(HtmlTextWriter.TagRightChar);, the writer is intelligent enough to close the tags. Again when using WriteRenderEndTag, you dont need to supply a parameter.

Edit. Im talking about different methods here. Here is the code I would use:

    output.AddAttribute("class", "dd0");

    if (!String.IsNullOrEmpty(this.LiLeftMargin))
    {
        output.AddAttribute("style", string.Format("margin-left: {0}px", LiLeftMargin));
    }

    output.RenderBeginTag("li");

    //output.Write(HtmlTextoutput.TagRightChar);
    output.AddAttribute("id", "dt1");
    output.RenderBeginTag("div");

    this.HyperLink.RenderControl(output);

    output.RenderEndTag(); //div
    output.RenderEndTag(); //li