Dim Loop1 As Integer
 Dim MyFileCollection As HttpFileCollection = Request.Files

 For Loop1 = 0 To MyFileCollection.Count - 1
    If MyFileCollection(Loop1).ContentType = "video/mpeg" Then
       '...
    End If
 Next Loop1

HttpFileCollection MyFileCollection = Request.Files;

 for (int Loop1 = 0; Loop1 < MyFileCollection.Count; Loop1++)
 {
    if (MyFileCollection[Loop1].ContentType == "video/mpeg")
    {
       //...
    }
 }

var myFileCollection : HttpFileCollection = Request.Files

for(var i=0; i < myFileCollection.Count; i++){
  if(myFileCollection[i].ContentType == "video/mpeg"){
      //...
  }
}