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

Check for the null condition as mentioned in below query

var maxTopID = (from max in dbcontext.Topics.Local
                 where  max.TopicId != null
                 select max.TopicID).Max();