This exception occurs when you attempt to modify a value in a read-only field (a column that has DataColumn.ReadOnly set to true ).

public class ReadOnlyException : DataException {
// Public Constructors
   public ReadOnlyException(  );  
   public ReadOnlyException( string s);  
// Protected Constructors
   protected ReadOnlyException(System.Runtime.Serialization.SerializationInfo info,
        System.Runtime.Serialization.StreamingContext context);
}

Hierarchy

System.Object System.Exception(System.Runtime.Serialization.ISerializable) System.SystemException DataException ReadOnlyException