https://learn.microsoft.com/en-us/dotnet/api/microsoft.visualbasic.fileio.textfieldparser.errorlinenumber?view=netframework-4.8.1&viewFallbackFrom=net-10.0
TextFieldParser.ErrorLineNumber Property (Microsoft.VisualBasic.FileIO) | Microsoft Learn
Returns the number of the line that caused the most recent MalformedLineException exception.
propertymicrosoftvisualbasicfileiolearn