searching words if found return text else return a boolean false

Why not just use string.Contains?

if (t.Contains("shall inure to all Bank Affiliates."))
   {
   ...
   }

Or am I missing something?


[edit]
Try this:

private string GetAgreementScope(string contents, System.IO.FileInfo file)
        {
            var texts = contents.Split('.');
            foreach (var t in texts)
            {
                if (t.Contains("shall inure to all Bank Affiliates."))
                {
                    return t;
                }
            }
        return null;
        }

[/edit]

If you want find text from file

bool IsTextMatch(string text)
   {
       List<string> lines = new List<string>(File.ReadAllLines("file"));
       //Option 1
       //int lineIndex = lines.FindIndex(line => line.StartsWith(text));
       //Option 2
       int lineIndex = lines.FindIndex(line => line.Contains(text));
       if (lineIndex != -1)
       {
           return true;//Yes it matched
       }
       else return false;
   }

How about this..

private bool TryGetAgreementScope(string contents, System.IO.FileInfo file, out string agreementScope)
        {
            var regex = new Regex(@".*shall inure to all Bank Affiliates.*");
            var texts = contents.Split('.');
            agreementScope = String.Empty;
            foreach (var t in texts)
            {
                if (regex.IsMatch(t))
                {
                    var AScope = (t.Trim());
                    agreementScope = Regex.Replace(AScope, @"\d", "");
                    return true;
                }
            }

            return false
        }

And you will use this function...

string returnAgreement = String.Empty;

if(TryGetAgreementScope(string contents, file, out returnAgreement  ))
{
     Console.WriteLine(returnAgreement);
}
else
{
     Console.WriteLine("Not Found");
}

In your code, you are not reading the file, and, as Dave K. points out, you are not specifying exactly what you need to return if there is a match. What if there are multiple matches ?

However, there are ways to "package" two (or more) types of values/objects and return them from a Method.

For example, you could use a KeyValuePair to return two items of different Types:

private KeyValuePair<bool, string> parseResult(string searchString, string contentString)
{
    return (contentString.Contains(searchString))
        ? new KeyValuePair<bool, string> (true, contentString)
        : new KeyValuePair<bool, string>(false, String.Empty);
}

Which you might use like this:

var searchResult = parseResult("yes", "no and yes.");

if (searchResult.Key)
{
   // match found
}
else
{
   // match not found
}

You could also use the Tuple Class to return two (or more) items of different Types:

private Tuple<bool, string> parseResult2(string searchString, string contentString)
{
    return (contentString.Contains(searchString))
        ? new Tuple<bool, string>(true, contentString)
        : new Tuple<bool, string>(false, String.Empty);
}

And, use it like this:

var searchResult2 = parseResult2("yes", "no and yes.");

if (searchResult2.Item1)
{
    // match found
}
else
{
    // match not found
}

There's nothing unusual about packaging multiple Types into a return of a method: you'll not the TryParse methods kind-of do this by demanding you pass in a variable using 'ref which is then modified to hold the content if there's a match.

And, of course, you could define a Class, or Struct, with as many Fields/Types as you wish, and have your analytic Method return an instance of the Class, or Struct. In this response I decided to use KeyValuePair, and Tuple, examples for ... variety.

well thank u guys for so much help ..


to give u the clarity on what i want ..

i want my program to search for the "" words,
pull the whole line there
and display it in a new text file as text under a field


but if at all its unable to find that text it will create another field in the same output text file , that would be a boolean value , yes or no .....i.e. if the match is null or empty.

Thanks ..
I am still stuck ..

Try This:

private bool GetAgreementScope(string contents, System.IO.FileInfo file)
{
      var regex = new Regex(@".*shall inure to all Bank Affiliates.*");
      var texts = contents.Split('.');
      foreach (var t in texts)
      {
          if (regex.IsMatch(t))
          {
              var AScope = (t.Trim());
              this.AgreementScope = Regex.Replace(AScope, @"\d", ""); 
              // the required line is stored in AgreementScope 
              // Assuming there are other function to write it to new file.
              return true;
          }else{
              return false;
          }
      }
}

Hope that helps.