get files of a specific format from a directory

Hi all,

I have a directory with several files in it. Some files have the following format:

"App_ct.out.1" and  "App_ct.out.2", .... 

I would like to use C# to check a directory to see if I have any file of the above format "App_ct.out.*" and get the full path of them and put them in a string array in a ascending order as the number in the extension. For example, suppose my directory has 100 of those files, I want to have a string array files[] like this:

 

files[0]=@"c:/ App_ct.out.1"

files[1]=@"c:/ App_ct.out.2" 

...

 files[9]=@"c:/ App_ct.out.10"

files[10]=@"c:/ App_ct.out.11"  

... 

 

Also if there is no file of the over format the files should give null.

 

Thank you so much.