How to execute a command from c#code

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C#3.0

C#

Hi,
I am want to run a command in cmd through c# code. For this purpose I used below two code

System.Diagnostics.Process process = new System.Diagnostics.Process();
            System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
            startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Maximized;
            startInfo.FileName = "cmd.exe";
            startInfo.Arguments = "chkdsk";
            process.StartInfo = startInfo;
            process.Start();

and

 ProcessStartInfo procStartInfo = new ProcessStartInfo("CMD.EXE", "defrag");
 procStartInfo.WindowStyle = ProcessWindowStyle.Maximized;
 procStartInfo.RedirectStandardOutput = true;
 procStartInfo.UseShellExecute = false;
 procStartInfo.CreateNoWindow = true;
 Process pro = new Process();
 pro.StartInfo = procStartInfo;
 pro.Start();

// string result = pro.StandardOutput.ReadToEnd();
// pro.WaitForExit();

The issue is , when I used first code then it open cmd but not run the command which I want and in case of second code it open cmd for just one second and it also does't run that command.
Can anybody help me in this matter.

Thank you.