C# asp.net webpage fix error on Gridview Sorting

I have an existing website C# Asp.net that sorting of the gridview gives the following error

Line 21: public Func<IEnumerable<T>, Func<T, object>, IEnumerable<T>> GetExpression()

Line 22: {

Line 23: return (c, f) => [url removed, login to view](f);

Line 24: }

Line 25: }

Source File: h:\root\home\ariem1-001\www\b2015\App_Code\[url removed, login to view] Line: 23

Stack Trace:

The website is written in Hebrew but I am available to step through the code.

Desain Grafis HTML PHP Desain Situs Web

ID Proyek: #6322568

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