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prevent postback javascript problem

Posted By:      Posted Date: September 27, 2010    Points: 0   Category :ASP.Net

i have the following example but i get error on GetPostBackEventReference line

value of tpe ...button cannot be converted to....

second question:where should i put this code? do i need just this code and nothing else

how should i for example delay for 20 seconds??

Dim sb As New System.Text.StringBuilder()
            sb.Append("if (typeof(Page_ClientValidate) == 'function') { ")
            sb.Append("if (Page_ClientValidate() == false) { return false; }} ")
            sb.Append("this.value = 'Please wait...';")
            sb.Append("this.disabled = true;")
            Me.btnAddPhotoComment.Attributes.Add("onclick", sb.ToString())



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