asp.net ValidatorCalloutExtender unhandled exception error

[murali_utr]

Unhandled exception at line 79, column 1 in http://localhost:49456/about\_us.aspx?\_TSM\_HiddenField\_=ToolkitScriptManager\_HiddenField&\_TSM\_CombinedScripts\_=;;AjaxControlToolkit,+Version=1.0.20229.20821,+Culture=neutral,+PublicKeyToken=28f01b0e84b6d53e:en-US:c5c982cc-4942-4683-9b48-c2c58277700f:e2e86ef9:9ea3f0e2:9e8e87e9:1df13a87:4c9865be:ba594826:757f92c2

0x800a139e - JavaScript runtime error: Sys.ArgumentNullException: Value cannot be null.

above error occured for the following code

<td style="text-align:left" class="content">
<asp:TextBox ID="txtName" Width="225px" AutoPostBack ="true" runat="server"
ValidationGroup="valEnquiry" CausesValidation="True" TabIndex="1"></asp:TextBox>
<br />
<asp:RequiredFieldValidator ID="RFName" runat="server" ValidationGroup="valEnquiry" ControlToValidate="txtName" ErrorMessage="Please Enter Your Name" ForeColor="Red"></asp:RequiredFieldValidator>
<cc1:ValidatorCalloutExtender
ID="val_reqDTT"
runat="server"
TargetControlID="RFName">
</cc1:ValidatorCalloutExtender>
</td>

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[Lost User]

The message is telling you where the error occurs, and what type of error it was. However we cannot guess what your Javascript code is trying to do.

[murali_utr]

hi Richard thanks for your reply. But there is no javascript code in the pages.

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[Lost User]

Then it must be in the Ajax code. You need to use your debugger to find out what value is missing, presumably the name field.

[murali_utr]

Thanks Richard. Thanks for your effort. Need to add the following tag in web.config file for .Net Framework 4.5

<appSettings>
<add key="ValidationSettings:UnobtrusiveValidationMode" value="None">
</appSettings>

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