how i can take backup of oracle usin my windows application

StreamWriter sw = new StreamWriter("reports\\backup.bat");
string name = "backUP-"+".dmp";string code1 = "exp  "+orclUser+"/"+orclPass+"@"+orclService+"  file = Backup\\"+name+" ";sw.WriteLine(code1);
sw.Close();
string strFilePath = System.IO.Path.GetFullPath("C:\\backup.bat");ProcessStartInfo psi = new System.Diagnostics.ProcessStartInfo();psi.FileName = strFilePath ;
psi.Arguments = "1 2 3 4";
System.Diagnostics.Process p = new System.Diagnostics.Process();
p.StartInfo = psi;
p.EnableRaisingEvents = true;p.Start();