The target '__Page' for the callback could not be found or did not implement ICallbackEventHandler.

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C#

VB

I converted this Code [^]
to vb.net
and I have this Problem
in C#

ClientScriptManager cm = Page.ClientScript;
          String cbReference = cm.GetCallbackEventReference(this, "arg","ReceiveServerData", "");
          String callbackScript = "function CallServer(arg, context) {" + cbReference + "; }";
          cm.RegisterClientScriptBlock(this.GetType(), "CallServer", callbackScript, true);

I converted it to in vb.net

Dim cm As ClientScriptManager = Page.ClientScript
          Dim cbReference As String
          cbReference = cm.GetCallbackEventReference(Me, "arg", "ReceiveServerData", "")
          Dim callbackScript As String = ""
          callbackScript &= "function CallServer(arg, context)" & "{" & cbReference & "; }"
          cm.RegisterClientScriptBlock(Me.GetType(), "CallServer", callbackScript, True)

I have invalid operation exception in
cbReference = cm.GetCallbackEventReference(Me, "arg", "ReceiveServerData", "")
The target '__Page' for the callback could not be found or did not implement ICallbackEventHandler.