System.Text.StringBuilder sb = 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;");
sb.Append(this.Page.GetPostBackEventReference(this.Button1));
sb.Append(";");
this.Button1.Attributes.Add("onclick", sb.ToString());


<script type="text/javascript">
function DisableControl(controlId)
{
  document.getElementById(controlId).disabled =true;
}
 
function DisableControl_SetTimeout(controlId,interval)
{
  setTimeout("DisableControl('" +controlId + "')",interval);
}
 
function btnSave_Click(control)
{
  DisableControl_SetTimeout(control.id,100);
}
</script>

Private Sub Page_Load(ByVal sender As System.Object,_
        ByVal e As System.EventArgs) HandlesMyBase.Load
 
  If Not Me.Page.IsPostBack Then
   Me.btnSave.Attributes.Add("onclick",_"btnSave_Click(this);")
  End If
End Sub

<%@ Page Language="VB" %>
<script runat="server">
    Dim counter As Integer
    Sub Page_Load()
       If Session("counter") Is Nothing Then
          counter = 0
       Else
          counter = CInt( Session("counter") )
       End If
       SafeButton.Attributes.Add("onclick", "disableButton();return true")
    End Sub
    
    Sub Process_Click(sender As Object, e As EventArgs)
       counter += 1
       Session("counter") = counter
       Dim i As Long
       ' 2-second delay
       Dim endTime As DateTime = DateTime.Now.AddSeconds(2)
       While DateTime.Now < endTime
       End While
       Label1.Text = counter.ToString()
       Label2.Text = DateTime.Now.ToString()
    End Sub
    
    Sub ClearCounter_Click(sender As Object, e As EventArgs)
       Session("counter") = 0
       Label1.Text = Session("counter").ToString()
    End Sub
</script>
<html>
<head>
    <style>
BODY {
   FONT-SIZE: 10pt; FONT-FAMILY: verdana; arial:
}
H2 {
   FONT-SIZE: 14pt; FONT-FAMILY: verdana; arial: font-weight:bold
}
</style>
<script language="javascript">
function disableButton()
{
   document.form1.SafeButton.style.visibility = "hidden";
}
</script>
</head>
<body>
    <form id="form1" runat="server">
        <h2>Testing Multiple Posting
        </h2>
        <p>
            Process count: 
                     <asp:Label id="Label1" 
                     runat="server" forecolor="Red" font-bold="True">
                     </asp:Label>
        </p>
        <p>
            Last clicked: <asp:Label id="Label2" runat="server"></asp:Label>
        </p>
        <p>
            The buttons run a process that takes 2 seconds to run.
        </p>
        <p>
            You can click this button multiple times during processing, potentially 
            resulting in the process running multiple times:
        </p>
        <p>
            <asp:Button id="UnsafeButton" 
                 onclick="Process_Click" 
                 runat="server" 
                 Text="Unsafe Button">
            </asp:Button>
            &nbsp;&nbsp;&nbsp;&nbsp;
        </p>
        <p>
            You can click this button only once to run the process:
        </p>
        <p>
            <asp:Button id="SafeButton" 
                 onclick="Process_Click" 
                 runat="server" 
                 Text="Safe Button">
            </asp:Button>
        </p>
        <p>
            <asp:LinkButton id="ClearCounter" 
              onclick="ClearCounter_Click" 
              runat="server" Text="Clear Counter">
           </asp:LinkButton>
        </p>
        <span id="span1"></span>
    </form>
</body>
</html>

 

<script language="javascript">
function disableButton()
{
   message.innerText = "Please wait "
   document.form1.SafeButton.style.visibility = "hidden";
}

</script>

function disableButton(){  window.setTimeout('disableAfterTimeout()',0);}function disableAfterTimeout(){   document.form1.SafeButton.disabled = true;}


<%@ Page Language="VB" %>
<script runat="server">
    Protected sessionGuid As String
    Protected viewstateGuid As String
    Protected doublePost As Boolean
    Protected pageCounter As Integer
    
    Sub Page_Load()
       If Session("pageCounter") Is Nothing Then
          pageCounter = 0
          Session("pageCounter") = 0
       Else
          pageCounter = CInt(Session("pageCounter"))
       End If
    
       Dim newGuid As String = System.guid.NewGuid.ToString
       If IsPostBack Then
          sessionGuid = Session("guid").ToString()
          viewstateGuid = Viewstate("guid").ToString()
          If sessionGuid = viewstateGuid Then
             doublePost = false
          Else
             doublePost = true
             Response.Write("Page has already been submitted.")
          End If
       End If
       Viewstate("guid") = newGuid
       Session("guid") = newGuid
    End Sub
    
    Sub Button1_Click(sender As Object, e As EventArgs)
       System.Threading.Thread.Sleep(2000) ' Fake a long process
       If Not DoublePost Then
          pageCounter += 1
          Session("pageCounter") = pageCounter
       End If
       Label1.Text = pageCounter.ToString()
    End Sub

</script>


 


<html>
<body>
    <form runat="server">
        <p>
            <asp:Button id="Button1" onclick="Button1_Click" runat="server" 
               Text="Button"></asp:Button>
        </p>
        <p>
            <asp:Label id="Label1" runat="server">Label</asp:Label>
        </p>
    </form>
</body>
</html>