public abstract string ContentType { get; }

Public MustOverride ReadOnly Property ContentType As String
	Get

public:
virtual property String^ ContentType {
	String^ get () abstract;
}

abstract ContentType : string with get

Dim Loop1 As Integer
 Dim MyFileCollection As UploadedFileCollection = KaxUpload1.UploadedFiles

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

UploadedFileCollection MyFileCollection = KaxUpload1.UploadedFiles;

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