I am switching from 1.1 to 2.0 and facing some problems with code, Getting a message on senderpage.Is startupScriptregisted has become obsolete instead use clientscript.

But when i replaced this:senderpage.RegisterStartupScript(alertKey, strScript)

to Clientscript.RegisterStartupScript(alertKey, strScript) getting another error message saying overloaded.

Public Function CreateMessageAlert(ByVal senderpage As System.Web.UI.Page, ByVal alertMsg As String, ByVal alertKey As String)
            Dim strScript As String

            strScript = " <script language=JavaScript>"
            strScript += "alert ('" + alertMsg + "');</script>"
            If (Not senderpage.IsStartupScriptRegistered(alertKey)) Then
                senderpage.RegisterStartupScript(alertKey, strScript)
            End If

        End Function

Also does'nt know what to put as return line at the end of function.

thankyou very much for the helpful info.

cplusplus1:

Also does'nt know what to put as return line at the end of function.

Since it will not return a value, change the function  to Sub instead.

Also, you don't need to take care of adding <script> tag , just pass true for the 4'th parameter of the RegisterStartupScript method.

This is the modified version of that method:

    Public Sub CreateMessageAlert(ByVal senderpage As System.Web.UI.Page, ByVal alertMsg As String, ByVal alertKey As String)
        Dim strScript As String = "alert ('" + alertMsg + "');</script>"
        If (Not senderpage.ClientScript.IsStartupScriptRegistered(alertKey)) Then
            senderpage.ClientScript.RegisterStartupScript(senderpage.GetType(), alertKey, strScript, True)
        End If
    End Sub