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Editorial Team
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Asked: 2026-05-15T21:05:00+00:00

Assuming I have the following ASP.NET HTML Code: <html> <head><title>Test Page</title></head> <body id=bodyID> <asp:Label

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Assuming I have the following ASP.NET HTML Code:

<html>
    <head><title>Test Page</title></head>
    <body id="bodyID">
        <asp:Label runat="server" id="lbl1" text="First Name:" />
        <asp:TextBox runat="server" id="txt1" /><br />
        <asp:Label runat="server" id="lbl2" text="Last Name:" />
        <asp:TextBox runat="server" id="txt2"></asp:TextBox>
    </body>
</html>

I am trying to write a linq query that will retrieve all the ID’s from any asp tag. Also, the query needs to group everything together alphabetically. So for the example above, the linq query should return “lbl1”, followed by “lbl2”, followed by “txt1”, and finally “txt2”. Notice it did not grab the “bodyID” because it was not part of an ASP.NET tag. Is there an easy way to do this? I am using C#, by the way.

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1 Answer

  1. Editorial Team

    If you’d like to use Linq To XML, you’d have to work around the <asp:> tags and that they don’t load cleanly into XML.

    This code will get you what you’re looking for, assuming:

    • you can load your ASPX markup into a string
    • the ASPX markup is valid XML.

    The replacement of the asp: with asp- may cause trouble if you have any valid asp: content that isn’t in a tag. This could be cleaned up to make it suit your needs. 

      public static void Main(string[] args)
    {
        string aspxCode = @"<html><head><title>Test Page</title></head>
                            <body id=""bodyID"">        
        <asp:Label runat=""server"" id=""lbl1"" text=""First Name:"" />
        <asp:TextBox runat=""server"" id=""txt1"" /><br />
        <asp:Label runat=""server"" id=""lbl2"" text=""Last Name:"" />
        <asp:TextBox runat=""server"" id=""txt2""></asp:TextBox>
    </body>
</html>";

        XElement xDoc = XElement.Parse(aspxCode.Replace("asp:", "asp-"));

        var allMatchingASPtags = xDoc.Descendants()
               .Where(d => d.Name.LocalName.StartsWith("asp-"))
               .Select(c => c.Attribute("id").Value);

        foreach (var t in allMatchingASPtags)
        {
            Console.WriteLine(t);
        }

        Console.ReadLine();
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