string exefile = "xxx.exe";
if (File.Exists(exefile)) {
    Process process = new Process();
　　 // params 为 string 类型的参数，多个参数以空格分隔，如果某个参数为空，可以传入””
    ProcessStartInfo startInfo = new ProcessStartInfo(exefile, params);
    process.StartInfo = startInfo;
    process.Start();
}

string exefile = "xxx.exe";
if (File.Exists(exefile)) {
    Process process = new Process();
    ProcessStartInfo startInfo = new ProcessStartInfo(exefile, path);
    startInfo.UseShellExecute = false;
    startInfo.RedirectStandardOutput = true;
    startInfo.CreateNoWindow = true;
    process.StartInfo = startInfo;
    process.Start();
    process.WaitForExit(2000);
    string output = process.StandardOutput.ReadToEnd();
    rtb_analyze.Text = output;
    process.Close();         
}

public void exec(string exePath, string parameters)
{
    Process process = new System.Diagnostics.Process();
    process.StartInfo.FileName = exePath;
    process.StartInfo.Arguments = parameters;
    process.StartInfo.UseShellExecute = false;
    process.StartInfo.CreateNoWindow = true;
    process.StartInfo.RedirectStandardOutput = true;
    process.Start();
    process.BeginOutputReadLine();
    process.OutputDataReceived += new  DataReceivedEventHandler(processOutputDataReceived);
}