紫纹螺一般不吃水草，紫纹螺又叫紫百合螺，属于大型淡水观赏螺之一，个体寿命可达4-5年，由于多变的漂亮色彩和较大的个体，因而具有很强观赏性，易饲养，对饲料、水质没有特别的要求，且能清理鱼缸，能与孔雀鱼等小型
I have a simple text box in a WPF application. I need to know when a character was added/deleted in the text box, which character and where it was added or deleted.
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