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Editorial Team
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Asked: 2026-06-06T09:26:29+00:00

Here is my code: public partial class Image : System.Web.UI.Page { protected void Page_Load(object

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Here is my code:

 public partial class Image : System.Web.UI.Page {
     protected void Page_Load(object sender, EventArgs e)
     {
         HtmlMeta tag = new HtmlMeta();
         tag.Attributes.Add("property", "og:type");
         Header.Controls.Add(tag);
     }
}

This is my error:

Server Error in ‘/Kidzania’ Application. Object reference not set to
an instance of an object. Description: An unhandled exception occurred
during the execution of the current web request. Please review the
stack trace for more information about the error and where it
originated in the code.

Exception Details: System.NullReferenceException: Object reference not
set to an instance of an object.

Source Error:

Line 18:         HtmlMeta tag = new HtmlMeta(); 
Line 19:         tag.Attributes.Add("property", "og:type"); 
Line 20:         Header.Controls.Add(tag);

Source File: d:\Kidzania\Image.aspx.cs Line: 20

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an
object.] Image.Page_Load(Object sender, EventArgs e) in
d:\Kidzania\Image.aspx.cs:20
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object
o, Object t, EventArgs e) +14
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender,
EventArgs e) +35 System.Web.UI.Control.OnLoad(EventArgs e) +99
System.Web.UI.Control.LoadRecursive() +50
System.Web.UI.Page.ProcessRequestMain(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
+627

i am refer all stackoverflow answer but not solve that problem please any help to assisted me please. thanks in advance for your answers

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1 Answer

  1. Editorial Team

    This how I think it will work.

    HtmlMeta htmmeta = new HtmlMeta();
htmmeta.Attributes.Add("property", "og:type");
this.Header.Controls.Add(htmmeta);

    Also you need to make sure that in your mark up header tag has runat server.

    <head runat="server">
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