System.ComponentModel.MaskedTextProvider.ResetString C# (CSharp) Method

        private void ResetString(int startPosition, int endPosition)
        {
            Debug.Assert(startPosition >= 0 && endPosition >= 0 && endPosition >= startPosition && endPosition < _testString.Length, "position out of range.");

            startPosition = FindAssignedEditPositionFrom(startPosition, forward);

            if (startPosition != invalidIndex)
            {
                endPosition = FindAssignedEditPositionFrom(endPosition, backward);

                while (startPosition <= endPosition)
                {
                    startPosition = FindAssignedEditPositionFrom(startPosition, forward);
                    ResetChar(startPosition);
                    startPosition++;
                }
            }
        }