Search a text in a file in c#

You have to use while since foreach does not know about index. Below is an example code. I worked a little bit the method that Rawling posted here to find more than one line in the same file until the end. This is what worked for me:. How are we doing? Please help us improve Stack Overflow. Take our short survey. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 9 years, 3 months ago. Active 1 year, 2 months ago. Viewed k times. I'm using linq to search for "CustomerEN" like this: File. ReadLines pathToTextFile. Improve this question. Add a comment. Active Oldest Votes.

If your pair of lines will only appear once in your file, you could use File. The string type, which is an alias for the System. String class, provides a number of useful methods for searching the contents of a string. The System. Regex class provides a rich vocabulary to search for patterns in text. In this article, you learn these techniques and how to choose the best method for your needs. The String. Contains , String. StartsWith , and String.

EndsWith methods search a string for specific text. The following example shows each of these methods and a variation that uses a case-insensitive search:. The preceding example demonstrates an important point for using these methods. Searches are case-sensitive by default. You use the StringComparison. CurrentCultureIgnoreCase enumeration value to specify a case-insensitive search.

These methods return the location of the text being sought. If the text isn't found, they return The following example shows a search for the first and last occurrence of the word "methods" and displays the text in between. Regex class can be used to search strings.

Rod 13k 26 26 gold badges silver badges bronze badges. What is the question? How do I get the user entered txt from the txt box to search all. At a glance, that's what the code already does.

Thats what I thought, but when I run the application, lblOutput. So use the debugger to step through the code. Show 4 more comments. Active Oldest Votes. Text string. Contains txtSerialSearch. Text ; if firstOccurrence! Improve this answer.

TimmRH 1 1 gold badge 1 1 silver badge 9 9 bronze badges. Andrew Andrew 6, 2 2 gold badges 31 31 silver badges 40 40 bronze badges. If this worked or solved your question, you should mark it as accepted answer the check below the votes , so your question doesn't appear unanswered.

Anyway I see you still have things to do, especially with that SID. Yes It worked, thank you, and yes, I plan to make a log file of the inputs, but wanted to get the main functions working first. Thanks Again! Add a comment. GetFiles textBox1. ReadAllText filename ; if match. Match fileContent, strSerial. Venkataraman R Venkataraman R What's the regular expression for? And where is it?