Change value in DBGrid

[MLNorton]

I need to change the value in a field in a DBGRid.
I use the following code:

Form_LettersDisplay.ADOTable1.edit;
Form_LettersDisplay.ADOTable1.FieldByName('MemLetter').AsString := 'Sent';
Form_LettersDisplay.ADOTable1.post;

This works but on the first record in the dataset, not the record I selected.

How can I solve this problem?

 

[DjangMan]

That should work. Is there a primary key for your table?

 

[MLNorton]

Yes, I have a Primary Key in the Table.

 

[DjangMan]

Do you have any event code associated with your ADOTable1?