Checking File Exists in Remote Server with server name and credentials.

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C#

I wanted to check whether the file exists in a remote server or not, i had tried with powershell but no result. can some one help me to work it out in any other way apart from third party website or DLL.

I am using the below code but no fruitful result for me :(

WSManConnectionInfo connectionInfo = new WSManConnectionInfo();
           connectionInfo.ComputerName = "ServerName";
           System.Security.SecureString SecPass = new System.Security.SecureString();
           string password = "xxx";

           foreach (char c in password)
           {
               SecPass.AppendChar(c);
           }

           connectionInfo.Credential = new PSCredential(@"abcd", SecPass);
           Runspace runspace = RunspaceFactory.CreateRunspace(connectionInfo);
           runspace.Open();
           using (PowerShell ps = PowerShell.Create())
           {
               ps.Runspace = runspace;
               ps.AddScript("Get-Service");

               // Do something with result ...

               PSCommand new1 = new PSCommand();
               String machinename = "ServerName";
               String file = "D:\\abc.txt";
               //new1.AddCommand("Invoke-Command");
               new1.AddParameter("computername", machinename);
               new1.AddParameter("filepath", file);


               ps.Commands = new1;
               Console.WriteLine(ps.Commands.ToString());
               var results = ps.Invoke();
               //Collection<psobject> results = ps.Invoke();

           }
           runspace.Close();