Hi,
You need to qualify the use of the Microsoft.VisualBasic assembly, before you can directly reference its methods, something like:
using Microsoft.VisualBasic;
Or you can reference the IsNumeric method by specifying it via it's full namespace, something like:
Microsoft.VisualBasic.Information.IsNumeric
Have a look at the following article on
C# Equivalent of VB's IsNumeric()[
^]
... hope it helps.