How to use XPath function in a XPathExpression instance programatically?

The function ends-with() is not defined for XPath 1.0 but only for XPath 2.0 and XQuery.

You are using .NET. .NET at this date does not implement XPath 2.0, XSLT 2.0 or XQuery.

One can easily construct an XPath 1.0 expression, the evaluation of which produces the same result as the function ends-with():

$str2 = substring($str1, string-length($str1)- string-length($str2) +1)

produces the same boolean result (true() or false()) as:

ends-with($str1, $str2)

In your concrete case you just need to substitute the right expressions for $str1 and $str2. They are, accordingly, /myXml/data and 'World'.

So, the XPath 1.0 expression to use, that is equivalent to the XPath 2.0 expression ends-with(/myXml/data, 'World') is:

'World' = 
             string-length(/myXml/data) - string-length('World') +1

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