public class SearchAndRepalce : Darrenstring
        {            
            public bool replaced;
            private string stringout;
            public SearchAndRepalce()
            {
            }
            public string searchandreplace(string inputstring, string searchstring, string replacestring, bool replaceall)
            {
                if (replaceall)
                {
                    replaced=true;
                    stringout = inputstring.Replace(searchstring, replacestring);
                    return stringout;
                }
                else
                {
                    Matchpattern A = new Matchpattern(inputstring, searchstring);
                    if (A.ismatch)
                    {
                        stringout = A.Before() + replacestring+A.After();
                        replaced=true;
                        return stringout;
                    }
                    else
                    {
                        replaced = false;
                        return null;                       
                    }                
                }               
            }
        }

private void Confirm_Click(object sender, EventArgs e)
        {
            Darrenstring.SearchAndRepalce A = new Darrenstring.SearchAndRepalce();
            Textout.Text = A.searchandreplace(Text.Text, Searchstring.Text, Replacestring.Text, Rplaceall.Checked);
        }