Aklımızda, blogumuzda dursun
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
If Not Page.IsPostBack Then
btnEKTalepEkle.Attributes.Add(
"onclick", "btnEKTalepEkle.disabled=true;" & Me.GetPostBackEventReference(Me.btnEKTalepEkle))
End If
End Sub