C# Loop to check if Directories exist

I am a newbie trying to populate a Months dropdown based on whether the directories exists for the particular month.

I know the directories names will be Jan 2010, Feb 2010, Mar 2015 and so on...

I am currently using...

if (System.IO.Directory.Exists("C:\\Desktop\\Month\\Jan\\"))
            {
                DropDownList1.Items.Add("Jan 2015");
            }
                if (System.IO.Directory.Exists("C:\\Desktop\\Month\\Feb\\"))
                {
                   DropDownList1.Items.Add("Feb 2015");  
                }
                    if (System.IO.Directory.Exists("C:\\\Desktop\\Month\\March\\"))
                    {
                        DropDownList1.Items.Add("March 2015");
                    }

How can I make this easier. I just want to loop through and if directory exists add particular name to the dropdown.

Thanks in advance