Why is this extension method not working?

My guess is you haven't included the namespace.

Ensure this method is in a static class of its own, separate class from the consuming DataRow.

namespace MyProject.Extensions
{
   public static class DataRowExtensions
   {
      //your extension methods
   }
}

In your consumer, ensure you're:

using MyProject.Extensions

I had this same issue. My mistake wasn't that I missed the static class or static method but that the class my extensions were on was not public.

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