C# script gets Validation (HTML5): Attribute 'language' is not a valid attribute of element 'script'

I'm editing an aspx page and the compiler is flagging up an information message

Validation (HTML5): Attribute 'language' is not a valid attribute of element 'script'.

but the script is for C#. I've tried googling this but the results all show how to fix it for JavaScript.

Any ideas on how to remove this validation message for C#?

<script language="C#" runat="server">
purplesoupProgrammerAsked:
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Fernando SotoRetiredCommented:
Try the script as follows.

<script language="C#" type="text/C#" runat="server">

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purplesoupProgrammerAuthor Commented:
Excellent - worked perfectly, thanks.
Fernando SotoRetiredCommented:
Not a problem, glad I was able to help.
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