C# - Executing CMD.exe with Arguments containing %VS110COMNTOOLS% - winforms

Question

I have been trying to execute the below mentioned command on cmd.exe from C#. I have tried the the below mentioned methods but none of them seem to work. They all are able to open CMD but nothing happens after that. Also if I use simple arguments like - "/C start winword" it works with Method 3 only.
Also I have tried adding /C and /K to the argumentstring but they don't seem to work as well.
string argumentString = "\"%VS110COMNTOOLS%/../IDE/devenv.exe\" /diff " + "\"" + txt_File1.Text + "\" \"" + txt_file2.Text + "\"";
//string argumentString = "start winword";
// Method 1
System.Diagnostics.Process ExecuteCommand = new System.Diagnostics.Process();
System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
startInfo.FileName = "cmd.exe";
startInfo.UseShellExecute = true;
startInfo.Arguments = argumentString;
ExecuteCommand.StartInfo = startInfo;
ExecuteCommand.Start();
//Method 2
System.Diagnostics.Process.Start(#"cmd.exe", argumentString);
// Method 3
System.Diagnostics.ProcessStartInfo procStartInfo = new System.Diagnostics.ProcessStartInfo("cmd", argumentString);
procStartInfo.RedirectStandardOutput = true;
procStartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
procStartInfo.UseShellExecute = false;
procStartInfo.CreateNoWindow = false;
System.Diagnostics.Process proc = new System.Diagnostics.Process();
proc.StartInfo = procStartInfo;
proc.Start();
string result = proc.StandardOutput.ReadToEnd();
Console.WriteLine(result);

Answer 1

Adding /k to arguments of cmd.exe does the work.
Check out the code:
using System;
namespace ProcessRun
{
class Program
{
static void Main(string[] args)
{
//var argumentString = "\"%VS120COMNTOOLS%/../IDE/devenv.exe\" /diff " + "\"" + txt_File1 + "\" \"" + txt_file2 + "\"";
string argumentString = "start winword";
// Method 1
Method1(argumentString);
//Method 2
Method2(argumentString);
// Method 3
Method3(argumentString);
}
private static void Method3(string argumentString)
{
System.Diagnostics.ProcessStartInfo procStartInfo = new System.Diagnostics.ProcessStartInfo("cmd", "/k " + argumentString);
procStartInfo.RedirectStandardOutput = true;
procStartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
procStartInfo.UseShellExecute = false;
procStartInfo.CreateNoWindow = false;
System.Diagnostics.Process proc = new System.Diagnostics.Process();
proc.StartInfo = procStartInfo;
proc.Start();
string result = proc.StandardOutput.ReadToEnd();
Console.WriteLine(result);
}
private static void Method2(string argumentString)
{
System.Diagnostics.Process.Start(#"cmd.exe", "/k " + argumentString);
}
private static void Method1(string argumentString)
{
System.Diagnostics.Process ExecuteCommand = new System.Diagnostics.Process();
System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal;
startInfo.FileName = "cmd.exe";
startInfo.UseShellExecute = true;
startInfo.Arguments = "/k " + argumentString;
ExecuteCommand.StartInfo = startInfo;
ExecuteCommand.Start();
}
}
}