how to read multi lines in text file in c#? -

I like reading that there is a multi line or a line in the text and then I'll read that multi line and convert a single line How can I do this?

You do not really need to check the file ReadAllLines () Always return the string array regardless of the number of stars, you can take advantage of that behavior and may only join the return array with the choice of your separator.

  string singleLine = string.Join ("", File.ReadAllLines ("filepath"));