c# simple expression Definition application *help*

Question

Hello everyone i want to write a c# windows form app that takes an expression and a Definition from a file, and when the user clicks the button it shows the definition for that expression in a text box, and i have no idea how to do it can someone please write me a simple program for educational purposes

Laxmidhar Sahoo · Answer

class ReadFromFile { static void Main() { // The files used in this example are created in the topic // How to: Write to a Text File. You can change the path and // file name to substitute text files of your own. // Example #1 // Read the file as one string. string text = System.IO.File.ReadAllText(@ "C:\Users\Public\TestFolder\WriteText.txt" ); // Display the file contents to the console. Variable text is a string. System.Console.WriteLine( "Contents of WriteText.txt = {0}" , text); // Example #2 // Read each line of the file into a string array. Each element // of the array is one line of the file. string [] lines = System.IO.File.ReadAllLines(@ "C:\Users\Public\TestFolder\WriteLines2.txt" ); // Display the file contents by using a foreach loop. System.Console.WriteLine( "Contents of WriteLines2.txt = " ); foreach ( string line in lines) { // Use a tab to indent each line of the file. Console.WriteLine( "	" + line); } // Keep the console window open in debug mode. Console.WriteLine( "Press any key to exit." ); System.Console.ReadKey(); }