C# How to split string based on 2 parameters?

Question

I have three string called This_is string1 and This is string2 There_is string3

How to split these 3 strings after \"This_\", \"T

Answer 1

The answer is simple, you can use the String.Split method, specifying the multiple delimiters (in your case the underscore and whitespace):

str.Split(new char[]{'_',' '})

LinQPad result:

If you want to split only the first part, you can use the 2nd overload of String.Split:

str.Split(new char[]{'_',' '}, 2);

and this is the result in LinQPad: