How to validate if current row being entered in editable grid already exits in grid

if you're talking about a new row that the user adds, basically you'd have to implement some validation that checks every column value in that row with every column value from prior rows, and determine if all values match the values from some prior row.  this would need to be done manually, but it shouldn't be that difficult.

if you're talking about a new row that the user adds, basically you'd have to implement some validation that checks every column value in that row with every column value from prior rows, and determine if all values match the values from some prior row.  this would need to be done manually, but it shouldn't be that difficult.

what do you mean by manually?

you'd have to manually build the logic to do the comparisons between a new row and existing rows, and use it for on-form validation.