关闭进程可以调用这个方法：
private void KillProcess(string processName)
{
System.Diagnostics.Process myproc= new System.Diagnostics.Process();
try
{
foreach (Process thisproc in Process.GetProcessesByName(processName))
{
if(!thisproc.CloseMainWindow())
{
thisproc.Kill();
}
}
}
catch
{}
}