How to find txt file name from a folder on buttonclick

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C#

i have lots of .txt file in a folder and all txt file contains some information. i have two text box 1st text box use for path of that folder where txt file present i put only folder path not txt path.In second text box type a word like Rose and click on submit button then how i find in which txt file contains that word "Rose" and how i store that txt file name in a variable.


i write code like this...

string Path = Convert.ToString(txtBrowse.Text.Trim());
            string Word = Convert.ToString(txtWord.Text.Trim());

          
            foreach (string file in Directory.GetFiles(Path, "*.txt"))
            {
                contents = File.ReadAllText(file);

                if (contents.Contains(Word))
                {
                    string foldername = file;

                    lbltab.Text = foldername;

                    break;
                }
            }

it gives me full path but i want only txt file name.


please help me solve it...
thanks...