public MyStringBuilder Append(MyStringBuilder value, int startIndex, int count)
 {
     _stringBuilder.Append(value._stringBuilder, startIndex, count);
     return(this);
 }
 public bool Equals(MyStringBuilder sb)
 {
     return(_stringBuilder.Equals(sb._stringBuilder));
 }
 public MyStringBuilder Append(MyStringBuilder value)
 {
     _stringBuilder.Append(value);
     return(this);
 }