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JavaScript Alert in not working in _RowUpdating event
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I have wriiten alert message as below in my webdatagrid_rowUpdating event.

if(APUtility.ToDateTime(e.Values["PTOStartDate"]) < System.DateTime.Now || APUtility.ToDateTime(e.Values["PTOSEndDate"]) < System.DateTime.Now)

{

String Message = PtoPopUpMessages(clsKeyDatesAndMetrics.clsKeyDatesAndMetricsRepalcementString.PTO_POPUP_VAL_PASTPTONONEDIT);

ScriptManager.RegisterStartupScript(wdgPTODetails, wdgPTODetails.GetType(), "Alerts", "alert('" + Message.ToString() + "')", true);

}

wdgPTODetails is my gird name. i am getting the message from database and wantted to show as alert. during debug i found that control goes to the statement but the alert message not popping up. please help.

my Design page looks like as below

<ig:webdatagrid id="wdgPTODetails" runat="server" autogeneratecolumns="False" height="350px"onrowadding="wdgPTODetails_RowAdding" onrowupdating="wdgPTODetails_RowUpdating" width="557px" ondatabound="wdgPTODetails_DataBound" DataKeyFields="PTOID">

<Columns>

<ig:BoundDataField DataFieldName="PTOID" Hidden="true" Key="PTOID"                          

DataType="System.Int32">

<Header Text="Pto_id" />

</ig:BoundDataField>

<ig:BoundDataField DataFieldName="UserID" Key="UserID" DataType="System.Int32">

 <Header Text="TM Name" /></ig:BoundDataField>

<ig:BoundDataField DataFieldName="PTOStartDate" Key="PTOStartDate"                              

DataType="System.DateTime"><Header Text="Start Date" />

<Footer Text="Start Date" /></ig:BoundDataField>

<ig:BoundDataField DataFieldName="PTOEndDate" Key="PTOEndDate"                

DataType="System.DateTime">

 <Header Text="End Date" />

</ig:BoundDataField>

 <ig:BoundDataField DataFieldName="PTOStatus" Key="PTOStatus">

<Header Text="Status" />

 <Footer Text="Status" />

 </ig:BoundDataField>

 </Columns>

 

behaviour section as below

<ig:EditingCore AutoCRUD="False">

<ig:CellEditing EditModeActions-EnableF2="true" EditModeActions-MouseClick="Single" EditModeActions-EnableOnKeyPress="true"

 Enabled="true">

<EditModeActions  MouseClick="Single"/>

 <ig:EditingColumnSetting ColumnKey="UserID" ReadOnly="true" ValidatorID="RequiredFieldValidator1"/>

<ig:EditingColumnSetting ColumnKey="PTOStatus" ReadOnly="True" />

<ig:EditingColumnSetting ColumnKey="PTOStartDate" EditorID="PTO_DatePicker" ValidatorID="RequiredFieldValidator1"/>

<ig:EditingColumnSetting ColumnKey="PTOEndDate" EditorID="PTO_DatePicker" ValidatorID="RequiredFieldValidator1"/>

</ColumnSettings>

</ig:CellEditing>


 

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