Thank you all! I have it working very well now!

>>I have a textbox and in the valid event I am trying to set a filter on the current table.
>>Code in Valid:
>>
>>select mytable
>>set filter to mytable.field1=this.value
>>
>>Field1 is c10. Every time I try to exit the field I get an error stating operator/operand mismatch.
>>BTW - I've tried LostFocus with the same results. Is this not a legal operation?
>
>John and Larry have done a good job of telling you what's happening. However, the best solution is to not use a filter. Add another view to the data environment then requery() it in the valid.