From the process creation flags documentation, I grab the values for each flag I'm trying to pass. Then, I pass the flags using like so:

const uint CREATE_SUSPENDED = 0x00000004;
const uint CREATE_NEW_CONSOLE = 0x00000010;

[DllImport("kernel32.dll", SetLastError = true)]
private static extern Boolean CreateProcess(String lpApplicationName, String lpCommandLine, IntPtr lpProcessAttributes, IntPtr lpThreadAttributes,
        Boolean bInheritHandles, UInt32 dwCreationFlags, IntPtr lpEnvironment, String lpCurrentDirectory, Byte[] lpStartupInfo,
        out PROCESS_INFORMATION lpProcessInfo);

public static MyCreateProcess(path, QuotedPath) {
    CreateProcess(path, QuotedPath, IntPtr.Zero, IntPtr.Zero, false, CREATE_SUSPENDED | CREATE_NEW_CONSOLE , IntPtr.Zero, null, ref SI, ref PI);
}