Object reference not set to an instance of an object

[Guest]

Hi,
I'm trying to create a page loading a XML file and declaring ASP.NET controls on an XSLT file.
the application is giving me the error "Object reference not set to an instance of an object" when i try to add an event handler (like button_click()) during the loading of the page.
How can I add the reference?
is it possible?
thank you

 

[Ben Dewey]

I am not exactly sure what you are asking. Can you please post you code?

The Object reference not set to an instance error usually occurs when a an
object is not set using the new keyword. For example when you try to use an
XmlDocument without setting the object equal to a "new XmlDocument()"

Hi,
I'm trying to create a page loading a XML file and declaring ASP.NET controls on an XSLT file.
the application is giving me the error "Object reference not set to an

instance of an object" when i try to add an event handler (like
button_click()) during the loading of the page.

 

[Guest]

Sure
I created an xslt file where i add an ASP:dropdownlist list1
Then, onload of the page, i'm loading xml,xsl and searching for the control "list1"
when i try to refer to ddl control, is giving that awful messag
Let me know if you need xsl file
thank yo

System.Xml.XmlDocument xmlDoc = new System.Xml.XmlDocument()

xmlDoc.Load(Server.MapPath("XML/nuovo.xml"))


System.Xml.Xsl.XslTransform transform = new System.Xml.Xsl.XslTransform()

transform.Load(Server.MapPath("XML/again.xslt"))
XmlUrlResolver resolver = new XmlUrlResolver();

System.IO.StringWriter swriter = new StringWriter()


transform.Transform(xmlDoc, null, swriter, resolver)


Page.FindControl("Form1").Controls.Add(Page.ParseControl(swriter.ToString()))

swriter.Close()



////here comes the erro
ddl = (DropDownList)Page.FindControl("list1")

ddl.SelectedIndexChanged += new EventHandler(ddl_SelectedIndexChanged)

 

[Ben Dewey]

I was able to add and find the control fine. your code looks good. Can you
send me the result of you StringWriter Transform Output.

The only way i was able to replicate you error is when I searched for a
control that wasn't actually there. Just make sure that you
StringWriter.ToString() is actually returning the list1 control.