Create,Modify and Delete a text file

string path = @"F:\MyTest.txt";
                if (!File.Exists(path))
                {
                    // Create a file to write to.
                    using (StreamWriter sw = File.CreateText(path))
                    {
                        sw.WriteLine("Hello");
                        sw.WriteLine("And");
                        sw.WriteLine("Welcome");
                    }

                }

[FileSecurityState_OperationNotPermitted]
Arguments: F:\MyTest.txt
Debugging resource strings are unavailable. Often the key and arguments provide sufficient information to diagnose the problem. See http://go.microsoft.com/fwlink/?linkid=106663&Version=5.0.60401.00&File=mscorlib.dll&Key=FileSecurityState_OperationNotPermitted