System.Array. does not contain a definition for “ToList”

Question

I\'m getting the above error on the ToList() line of the code below

if (emailReplyTo != null)
{
  System.Collections.Generic.List replyto
    = ema         


        

Answer 1

This is simply because ArrayList does not expose a method named ToList.

See this MSDN page for a table view of the members available to you.

As explained by others, you may access this extension method by importing the Linq library:

using System.Linq;

Also, see this link for a custom implementation of such, should you desire to implement one.