Displaying all the aspx project into dropdownlist

string sourceDirectory = Server.MapPath("~/"); 

 DirectoryInfo directoryInfo = new DirectoryInfo(sourceDirectory); 

 var aspxFiles = new List   

(Directory.GetFiles(sourceDirectory,"*.aspx",SearchOption.AllDirectories)); 

for (int i = 0;i   

  {      

  string[] smsg = aspxFiles[i].Split('\\');     

   int a = smsg.Count();     

   sourceDirectory = smsg[a - 1].ToString().Trim(); 

  this.dropdownlist1.Items.Add(sourceDirectory);  

  }

from the above code displaying all the aspx page into dropdownlist

i have one folder called Employee.

in Employee folder Two aspx page as follows

Emplogin.aspx and Empmaster.aspx

In the dropdownlist1 i am displaying .aspx page. but i dont want to show the above Employee folder two aspx page 

Emplogin.aspx and Empmaster.aspx dont want to show in the dropdownlist1.


for that how can i do in asp.net using c#.