GridView具有大量数据的奇怪行为？

Question

I am creating a web report that uses a GridView with a SqlDataSource as the data source, and it is crashing for what seems to be large GridView s. The web page allows the user to enter a date range, click a "Search" button, and then it does a SQL query based on the dates. I know that the query works and that the dates are pulled correctly, but here is what's happening to cause the crash:

1. The user enters a large date range, and the "Search" button is clicked
2. The query runs, and correctly returns ~4500 entries
3. The user then enters a single day and clicks the "Search" button
4. Program crashes, giving this error message:

   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.InvalidOperationException: Operation is not valid due to the current state of the object.

Looking at the stack trace and with a few breakpoints here and there, I'm pretty sure that this is happening before the OnClick method of the button is even called. This has happened to me before on a similar report page that I made a month ago, but I would like to know why.

What is happening here?

I am executing this in debug mode on VS 2008, and I am coding in C# ASP.NET, if any of that makes a difference. Also, I'm not sure what code would help, let me know if I need to edit and post some.

EDIT Here is the Stack Trace:

[InvalidOperationException: Operation is not valid due to the current state of the object.] System.Web.HttpValueCollection.ThrowIfMaxHttpCollectionKeysExceeded() +2692462 System.Web.HttpValueCollection.FillFromEncodedBytes(Byte[] bytes, Encoding encoding) +61 System.Web.HttpRequest.FillInFormCollection() +148

[HttpException (0x80004005): The URL-encoded form data is not valid.] System.Web.HttpRequest.FillInFormCollection() +206 System.Web.HttpRequest.get_Form() +68 System.Web.HttpRequest.get_HasForm() +8743895 System.Web.UI.Page.GetCollectionBasedOnMethod(Boolean dontReturnNull) +97 System.Web.UI.Page.DeterminePostBackMode() +63 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +133

Answer 1

There you go, you have exceeded postdata limit . I believe you are posting back your entire grid to the server.