IT Answers » ASP.NET

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New Discussion Post by TomLiotta

Database in ASP.NET

Tejashree — Thu, 21 Jun 2012 11:18:27 +0000

hi,
I have 2 tables category,course

in category table there are 2 columns-

cateogyr_id (pk)
category_name

and in course table
course_id(pk)
name

fees
duration
category_id(fk)

category_name

and i have one form in asp.net on which i have following columns
course id
name
fees
duration

category(id)(dropdownlist)

now plese tell me what is the coding for following query-
when i choose id of that perticular course i want to insert category_id as well as category_name in course table

Error during run time

Biggner — Thu, 05 Apr 2012 18:45:21 +0000

Dear experts,

I am developing a website in ASP.NET using C# and I am facing the following error :

Invalid postback or callback argument. Event validation is enabled using
in configuration or <%@ Page EnableEventValidation=”true” %>

in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.ArgumentException: Invalid postback or callback argument. Event validation is enabled using
in configuration or <%@ Page EnableEventValidation=”true” %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:

in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.]
System.Web.UI.ClientScriptManager.ValidateEvent(String uniqueId, String argument) +8623897
System.Web.UI.Control.ValidateEvent(String uniqueID, String eventArgument) +72
System.Web.UI.WebControls.DropDownList.LoadPostData(String postDataKey, NameValueCollection postCollection) +53
System.Web.UI.WebControls.DropDownList.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) +13
System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) +346
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1743

How can I solve it?

Regards..

[/argumentexception:]