Swapping images in a rendered html document

Question

I am interested in changing an image in an HTMLUIControl after the page has been rendered.  

The following statement does not appear to work:

this.image1.Attributes["src"].Value = "..\..\btnStep3d0.bmp";

It gives me this error:

“Object reference not set to an instance of an object.”

I made sure that I had instanciated image1.  The following code was executed before trying to add an image to the document.
 
public void htmluiControlLoadFinished()
		{
			WireElements();
			
		}

		private void WireElements()
		{
			try
			{
				htmlelements = htmlCtrl.Document.GetElementsByUserIdHash();
							
				this.image1 = htmlelements["Image1"] as BaseElement;

...

Here is the HTML Code I used (abbreviated):

	
		
			
				
				
			
			
				
				
			
			
				
				
			
		
	



I also tried loading the document without attempting to change the image.  It worked fine.  It loaded images directly hard coded into the html document.  I just cannot change out the image after it is loaded.

I also wondered whether not having quotes on the statement was making a difference.  So, I tried the following statement:

this.image1.Attributes["src"].Value = ""..\..\ImageName.bmp"";

I got the same error as above.  Can someone see something in my code that is incorrect?

Any help or advice would be appreciated.

Neil Conway · Answer

I forgot that the forum would try to render my piece of html code.  Here it is again without brackets:

 td IMG alt="" src="" id="Image1"
				/td

Neil Conway · Answer

I found the error.  The wiring event was not firing.  My apologies for the false alarm.  I thought that there was a problem with how I had entered the filepath of the image.  That turned out not to be the case.