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I am not sure my post was an answer but if it helped you - you are welcome.<br />
<br />
Did you find the problem?
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I am not sure my post was an answer but if it helped you - you are welcome.

Did you find the problem?

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<div class="content wysiwyg-content">
I have this mark up to change the video tag attributes:<br />
<br />
Video File Name: &lt;%= sampleVar%&gt;<br />
&lt;video id=&quot;Video1&quot; controls=&quot;controls&quot; autoplay=&quot;&lt;%= autoPlayVar%&gt;&quot; &nbsp;&gt;<br />
&nbsp; &lt;source src=&quot;&lt;%= sampleVar%&gt;.ogv&quot; &nbsp;type=&quot;video/ogg&quot; /&gt;<br />
&nbsp; &lt;source src=&quot;&lt;%= sampleVar%&gt;.webm&quot; type=&quot;video/webm&quot; /&gt;<br />
&nbsp; &lt;source src=&quot;&lt;%= sampleVar%&gt;.mp4&quot; type=&quot;video/mp4&quot; / &gt;<br />
&lt;/video&gt; &nbsp;<br />
<br />
in my vb.net code behind pageload event, I have<br />
autoplayvar=&quot;true&quot;<br />
samplevar=&quot;samplevideo&quot;<br />
me.databind<br />
<br />
When I bring up the page I see<br />
Video File Name: samplevideo <br />
<br />
This is what I would expect to see so the samplevar variable is getting set, but the video control shows 'invalid source' and does not work.<br />
<br />
But if I replace the &lt;%= sampleVar%&gt; markup with the text of &quot;samplevideo&quot;, all works fine and as it should.<br />
<br />
So what is not right? &nbsp;Is this the wrong event due to timing to use in the code behind?
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I have this mark up to change the video tag attributes:

Video File Name: <%= sampleVar%>
<video id="Video1" controls="controls" autoplay="<%= autoPlayVar%>"  >
  <source src="<%= sampleVar%>.ogv"  type="video/ogg" />
  <source src="<%= sampleVar%>.webm" type="video/webm" />
  <source src="<%= sampleVar%>.mp4" type="video/mp4" / >
</video>  

in my vb.net code behind pageload event, I have
autoplayvar="true"
samplevar="samplevideo"
me.databind

When I bring up the page I see
Video File Name: samplevideo 

This is what I would expect to see so the samplevar variable is getting set, but the video control shows 'invalid source' and does not work.

But if I replace the <%= sampleVar%> markup with the text of "samplevideo", all works fine and as it should.

So what is not right?  Is this the wrong event due to timing to use in the code behind?

changing html5 video attributes

HTML (HyperText Markup Language) is the main markup language for creating web pages and other information to be displayed in a web browser, providing both the structure and content for what is sent from a web server through the use of tags. The current implementation of the HTML specification is HTML5.

HTML

Visual Basic .NET (VB.NET) is an object-oriented programming language implemented on the .NET framework, but also supported on other platforms such as Mono and Silverlight. Microsoft launched VB.NET as the successor to the Visual Basic language. Though it is similar in syntax to  Visual Basic pre-2002, it is not the same technology,

Visual Basic.NET

Active Server Pages (ASP) is Microsoft’s first server-side engine for dynamic web pages. ASP’s support of the Component Object Model (COM) enables it to access and use compiled libraries such as DLLs. It has been superseded by ASP.NET, but will be supported by Internet Information Services (IIS) through at least 2022.