(.NET Version 2.0.50727) VS2005

Code:
strGetFiles = Directory.GetFiles(strDirectory, strFileType[0], searchOption);

strGetFiles1 = Directory.GetFiles(strDirectory, strFileType[1], searchOption);
I am getting all the file names(locations) of a specific type and placing them into a string array (strGetFiles[]). I am having to do this 2 times (into two seperate arrays) because I am searching for *.bmp in the first one and *.gif in the second. This is forcing me to use two different arrays when I really would like all of them to be combined into one array. I would like to do something like this:

Code:
strGetFiles = Directory.GetFiles(strDirectory, strFileType[0], searchOption);

strGetFiles += Directory.GetFiles(strDirectory, strFileType[1], searchOption);
I know this doesn't work, but you get the idea. I want to append the second array to the end of the first one. Is there a way to do this? Or is there a way to use the GetFiles command and include more than one filetype?

If I need to elaborate, please let me know.

Thanks,
Aaron