validate textbox in asp.net using onblur with __doPostBack

Question

Public Class MyTextBox Inherits TextBox Implements IPostBackEventHandler

Protected Overrides Sub OnInit(ByVal e As System.EventArgs) 
    MyBase.OnInit(e) 
    If Not Page.ClientScript.IsClientScriptBlockRegistered("OnBlurTextBoxEvent") Then 
        Page.ClientScript.RegisterStartupScript(MyBase.GetType, "OnBlurTextBoxEvent", GetScript, True) 
        Attributes.Add("onblur", "OnBlurred(" & UniqueID & ",'')") 
    End If 
End Sub 

Public Delegate Sub OnBlurDelegate(ByVal sender As Object, ByVal e As EventArgs) 

Public Event Blur As OnBlurDelegate 

Protected Sub OnBlur() 
    RaiseEvent Blur(Me, EventArgs.Empty) 
End Sub 

Private Function GetScript() As String 
    Return "function OnBlurred(control, arg)" & vbCrLf & _ 
            "{" & vbCrLf & _ 
            "    __doPostBack(control, arg);" & vbCrLf & _ 
            "}" 
End Function 

Public Sub RaisePostBackEvent(ByVal eventArgument As String) Implements System.Web.UI.IPostBackEventHandler.RaisePostBackEvent 
    OnBlur() 
End Sub 

End Class

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I am trying to use this. But couldn't success, Pl. give me the client side code for this Thank u

Santhosh