How to Open PowerCli and run commands through c#

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C#

Am using the following code to Open PowerCli from C# and run commands on PowerCli through a button click.. after clicking the button in the debugger output am getting "The thread 0x104c has exited with code 259 (0x103)." which means my code was not succesfull . i dont know whats going wrong in my code can you please suggest me whats wrong am doing in my code?

Here is my code:

private void Powercli_Click(object sender, EventArgs e)
        {
            RunspaceConfiguration config = RunspaceConfiguration.Create();
            Runspace runspace = RunspaceFactory.CreateRunspace(config);
            // open it
            runspace.Open();
            try
            {
                // import PowerCLI ViCore snapin
                PSSnapInException warning;
                config.AddPSSnapIn("VMware.VimAutomation.Core", out warning);
                if (warning != null)
                {
                    throw warning;
                }
                // create a pipeline and feed it the script text
                Pipeline pipeline = runspace.CreatePipeline();
                // Create Command to Set Na Option
                var access = new Command("Connect-VIServer");
                access.Parameters.Add("Server", "192.168.123.108");
                access.Parameters.Add("Protocol", "https");
                access.Parameters.Add("User", "root");
                access.Parameters.Add("Password", "assign");
              // Add Command to Pipeline 
                pipeline.Commands.Add(access);
                //Execute by invoking
                pipeline.Invoke();
            }
            finally
            {
                runspace.Close();
            }