x means nothing , it is just a symbol. it represented the input value.
for exsample:you write x>0 and x<10 in TField.CustomCostraint, and set the related property to true. then when you set TField.FieldByName('your fieldname ').asinteger:=15, there will raise a error.
for exsample:you write x>0 and x<10 in TField.CustomCostraint, and set the related property to true. then when you set TField.FieldByName('your fieldname ').asinteger:=15, there will raise a error.
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