Introduction - If you have any usage issues, please Google them yourself
First () method of reading File.ReadAllLines into a text document and return a string array contents, so that each row of data has become an element of the string array contents, and then use split () method to each element of a space or tab-delimited, returns an array of strings, and a row of data has been returned three string into an array of strings by Convert.ToDouble () method to convert a double type and calculations. Create a StringBuilder string data type each line added to it, converted to string, and finally write the new document with the File.WriteAllText methods. The advantage is simple, the disadvantage is that only a small document read