>>I have a lot of gpf each day.
>>I posted a demo of VFP 7 C5 errors at
>>
>>www.eetasoft.ee/c5demo.zip
>
>The archive seems to be irregular - Winzip complains and won't open it. Would you check it, please?

Can you check the size - 1339277 bytes.
A number of people are downloading it and I haven't touched it.
Maybe try again. I narrowed now a problem and can prepare now a bit smaller
sample.

I have a command F3 "change grid form" in my form.
This command destroys all grid columns and adds new columns to grid.

To destroy columns I use

  this.gridbase1.columncount = 0  && C5 error occurs in this line

I tried also

  DO WHILE this.gridbase1.columncount>0
    this.gridbase1.DeleteColumn   &&& C5 error occurs in this line
    ENDDO

It seems that removing all grid columns causes C5 error in VFP 7 but works in VFP 5.

Is there a way to remove all grid columns in some other way ?