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How to validate the AddNewRow value based on existing records in WPF DataGrid (SfDataGrid)?

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You can validate the newly adding row value based on the existing records by using CurrentCellValidating event in WPF DataGrid (SfDataGrid).


this.sfGrid.CurrentCellValidating += sfGrid_CurrentCellValidating;
void sfGrid_CurrentCellValidating(object sender, Syncfusion.UI.Xaml.Grid.CurrentCellValidatingEventArgs args)
   bool isAddNewRow = sfGrid.IsAddNewIndex(sfGrid.SelectionController.CurrentCellManager.CurrentRowColumnIndex.RowIndex);
   if (!isAddNewRow)
   if (args.Column.MappingName == "Name")
      var text = args.NewValue.ToString();
      var datacontext = (this.DataContext as UserInfoViewModel).UserDetails;
      var listOfNames = datacontext.Where(e => e.Name.Equals(text)).ToList();
      if (listOfNames.Count > 0)
         args.ErrorMessage = "Entered Name is  already existing";
         args.IsValid = false;

You can also use RowValidating event to validate the row when the cell is edited. The RowValidating event occurs when the edited cells try to commit the row data or lose the focus.

Validate the new row based on existing records in WPF DataGrid

View sample in GitHub.

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