How do i capture cmd log from server to local while install winservice using psexec

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C#

PowerShell

String command = "installutil/i";
		    string wanted_actual = "D:\\pstools\\";
                    string wanted = wanted_actual + "PsExec";               

                    String folderpath2 = D:\Winservice\Service.exe
                    String total = (command + " " + folderpath2);

                    System.Diagnostics.Process proc = new System.Diagnostics.Process();
                    ProcessStartInfo procStartInfo = new ProcessStartInfo();
                    procStartInfo.FileName = wanted;    
                    procStartInfo.WorkingDirectory = Path.GetDirectoryName(wanted_actual);                                  
                    procStartInfo.Arguments = @"\\" + txt_Serverip.Text + " -u " + txt_Username.Text + " -p " + txtPassword.Text + " -accepteula" + " -s" + " -w " + "C:\\Windows\\Microsoft.NET\\Framework\\v4.0.30319" + " cmd " + "/c " + total;
                    proc.StartInfo = procStartInfo;
                    proc.StartInfo.RedirectStandardOutput = true;
                    procStartInfo.UseShellExecute = false; //To hide window
                    procStartInfo.CreateNoWindow = true; //To hide window
                    procStartInfo.WindowStyle = ProcessWindowStyle.Hidden; //To hide window                   
                    proc.Start();

                    richTextBox1.Text = proc.StandardOutput.ReadToEnd();

What I have tried:

I want to Capture installed log from server to Local . Using
proc.StandardOutput.ReadToEnd(); i am able to capture only first 2 lines of log from server
Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
But the same command i execute from cmd able to view the entire winservice installed log in cmd prompt. but while install using C# unable to view the log in richTextBox1.Text

Please help me ...