when enter the text to find the string i want to ignore the case how to implement that in a context below

public override void Search()
            //file = new FileStream(@"C:\username.txt", FileMode.Open, FileAccess.Read);
            Console.WriteLine("Input a string ");
            String data = Console.ReadLine();
            sr = File.OpenText(@"C:\username.txt");
            String st = sr.ReadToEnd();
           // How to implement ignore cases 
                if (st.Contains(data))
                    Console.WriteLine("Found at position :" + st.IndexOf(data));
                    Console.WriteLine("Not Found");


You can do something like this:

if (st.ToLower().Contains(data.ToLower()))

Thanks a million but i got some other solution. Thanks

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