This error usually happens because WebGrid get a timeout when connecting to server. The other possibilities are because useing unbound. In unbound mode, this error will show everytime you use FlyPostBack request such as sorting, refresh, accept changes, etc.

Could you please let me know how do you bind your WebGrid and how do you handle the update process?

hello   Riendy Setiadi, Thank you very much for you answer. The follow attachement is my project code. In which it show how how i bind the webgrid and update it!

Hello,

This error occurs when WebGrid could not bind the data. There are some mistakes when bind the data :

1. Select query to bind data into WebGrid got an error.

You can check Execute query on query builder. Please follow this steps to checking :

• Right click on AccessDataSource1 then select Configure Data Source...
• Then select next twice.
• Click on button Query Builder... to execute query. (There will show you an error message)

2. Display structure on WebGrid did not match with data in AccessDataControl1

   You makes 8 column in WebGrid which is doesn't exist in AccessDataControl1. There are Quantity, Discount, TotalMoney, and OrderID in your display structure.

Because of this mistaken, there is no database that bound, so WebGrid has return null and cannot use any FlyPostBack request.

I have modified your sample and using AccessDataSource2. you can check on my attachment.

Please do not hestitate to ask if you still have a question.

Riendy