That code is invalid.
"dir name lists files and folders that match name. When name is a folder, dir lists the contents of the folder. Specify name using absolute or relative path names. The name argument can include the * wildcard in the file name, and both the * and the wildcard in the path name. Characters next to a wildcard must be file separators."
Your code
evalc('dir **Marksheet.csv**')
uses the wildcard without being adjacent to file separators.
If you want the files ending in Marksheet.csv that are in a different directory then
resultsdir = '/stimulus/test/results';
dinfo = dir( fullfile(resultsdir, '*Marksheet.csv') );
filenames = fullfile( resultsdir, {dinfo.name} );
Notice the complete lack of evalc(). The cell array of character vectors, filenames, will have each file name fully qualified.
