Open .hta file Application in Windows Form using C#

using System.IO;                 // File.
using System.Diagnostics;        // Process.





 private void button3_Click(object sender, EventArgs e)
 {

    string  sFileHTA = C:\Users\dattatray\Desktop\UPS\RatingToolGenSource\RatingTool.hta";

string sErr = "";
     sErr = Open_HTA(sFileHTA);
     if (sErr != "")
     {
         MessageBox.Show(sErr);
     }
 }

 // Open an HTML Application.
 private string Open_HTA(string sFileName_hta)
 {
     

    string sErr = "";
     if (File.Exists(sFileName_hta) == false)
     {
         return "Application not found.";
     }
     try
     {
         Process p = new Process();
         p.StartInfo.UseShellExecute = true;
         p.StartInfo.WindowStyle = ProcessWindowStyle.Normal;
         p.StartInfo.ErrorDialog = true;
         p.StartInfo.FileName = sFileName_hta;
         p.Start();
         p.Dispose();
     }
     catch (Win32Exception ex)
     {
         sErr = ex.Message;
     }
     return sErr;
 }