>I'm converting a VFP app that produces versions that start with "A" and proceed upward.
>So, if the latest version is "C", the next version is "D", etc.
>Developing the next version letter was easy in VFP, but all the answers I'm finding for C# seems needlessly cumbersome.
>
>What is the simplest way to put the next version letter in string NextVersion when the current version is in string CurrentVersion?

You don't give much detail on the actual structure of the string. Maybe something like:

string CurrentVersion  = "123D456";
 
 // One way
char[] c = CurrentVersion.ToCharArray();
c[3]++;
string NextVersion = new string(c);

 //Another way
char x = CurrentVersion[3];
NextVersion = CurrentVersion.Replace(x, ++x);

but what should happen when you get to 'Z' ?