Ajax Calender Extender problem in production Server

[satya9m]

<asp:ToolkitScriptManager ID="toolkitscriptmanager"  runat="server">
    </asp:ToolkitScriptManager>
 
 <asp:TextBox ID="TxtStartDate" CssClass="BodyTextBlue" runat="server"></asp:TextBox>
                    <asp:CalendarExtender ID="AjxTxtStartDate" runat="server" CssClass="cal_Theme1"  TargetControlID="TxtStartDate">
                    </asp:CalendarExtender>
                    <asp:RegularExpressionValidator Display="Dynamic" ID="RegStartDate" SetFocusOnError="true"
                        runat="server" ControlToValidate="TxtStartDate" ErrorMessage="mm/dd/yyyy"
                        ValidationExpression="^(([0]?[1-9]|1[012])[ /]([0]?[1-9]|[12][0-9]|3[01])[ /](19|20)\d\d)|((1[012]|0[1-9])(3[01]|2\d|1\d|0[1-9])(19|20)\d\d)">
                    </asp:RegularExpressionValidator>
                    to
                    <asp:TextBox ID="TxtEndDate" CssClass="BodyTextBlue" runat="server"></asp:TextBox>
                    <asp:CalendarExtender ID="AjxEndDate" runat="server" CssClass="cal_Theme1"  TargetControlID="TxtEndDate">
                    </asp:CalendarExtender>
                    <asp:RegularExpressionValidator Display="Dynamic" ID="RegEndDate" SetFocusOnError="true"
                        runat="server" ControlToValidate="TxtEndDate" ErrorMessage="mm/dd/yyyy" 
                        ValidationExpression="^(([0]?[1-9]|1[012])[ /]([0]?[1-9]|[12][0-9]|3[01])[ /](19|20)\d\d)|((1[012]|0[1-9])(3[01]|2\d|1\d|0[1-9])(19|20)\d\d)">
                    </asp:RegularExpressionValidator>

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"""THIS IS WORKING ONLY WHEN CLICKING ON BUTTON FOR POST BACK OCCURED"""
Please help me, I want to using Server.Transfer to visit the page. the calender is working only when using Response.redirect