How to Automate Qtp with C sharp

qtApp = new QuickTest.Application(); // reference to QTP Application
qtApp.Launch();  // Launch QTP
qtApp.Visible = true; // or false - set visible state
qtApp.Options.Run.RunMode = "Normal";  // Run Mode
qtApp.Options.Run.StepExecutionDelay = 250;  // Delay between execution of steps
qtApp.Options.Run.ViewResults = false;  // Do not view results at end of test

string scriptPath = uncPathToScript;  // UNC path to script, or and other drive/location that the application invoking QTP has access to
qtApp.Open(scriptPath, true, false);  // Open the script, read only, do not save changes

// Get a reference to the test object
QuickTest.Test qtTest = qtApp.Test;  // Get reference to test object opened/created by application

qtTest.Settings.Run.OnError = "NextStep"; // Stop

// Get a reference to the Results Object for  test results location
QuickTest.RunResultsOptions qtRRO = new QuickTest.RunResultsOptions();  // This is just here because, possible not necessary

string dt = DateTime.Now.ToString("MM/dd/yyyy HH:mm:ss");
dt = dt.Replace("/", "-");
dt = dt.Replace(":", "-");
dt = dt.Replace(" ", "-");

string reportDirectory = uncPathToScript.Substring(uncPathToScript.LastIndexOf("\\") + 1);
reportFilePath = uncPathToScript + "\\" + reportDirectory + "_" + dt;

// Create the report directory under the test itself with a date time stamp

System.IO.Directory.CreateDirectory(reportFilePath);  // Create the report directory as a subdirectory of the script to run

qtRRO.ResultsLocation = reportFilePath;  // Set results location to newly created path (folder)

// Run the test
qtTest.Run(qtRRO, true, null);  // run the test
qtTest.Close();  // Close the test
System.Runtime.InteropServices.Marshal.FinalReleaseComObject(qtTest);  // Cleanly release COM object
qtTest = null; // set object to null

qtApp.Quit();  // Quit QTP

GC.Collect();  // Garbage collect
GC.WaitForPendingFinalizers();  // Wait for GC
System.Runtime.InteropServices.Marshal.FinalReleaseComObject(qtApp);  // Cleanly release COM Object
qtApp = null;  // set to null