C# Finding the maximum value of a string with linq

Question

This is what I have and it keeps returning null.

It doesn\'t recognize the Convert.toInt32 when I add a where statement

var maxTopID = (from max in         


        

Answer 1

How about converting the TopicID in SELECT and use String.IsNullOrEmpty() to remove empty string, like:

 var maxTopID = (from max in dbcontext.Topics.Local
                 where !String.IsNullOrEmpty(max.TopicID)
                 select Convert.ToInt32(max.TopicID)).Max();

See the Demo