C# Console uses mspaint to open and save images

 process = new ();
process = ("", path);
int processId = ;
AutomationElement element = FindWindowByProcessId(processId);
("^s"); //Send Ctrl + s key("%{F4}"); // Send Alt + F4 keys

public static AutomationElement FindWindowByProcessId(int processId)
{
  AutomationElement targetWindow = null;
  int count = 0;
  try
  {
    Process p = (processId);
    targetWindow = ();
    return targetWindow;
  }
  catch (Exception ex)
  {
    count++;
    StringBuilder sb = new StringBuilder();
    string message = (("Target　window　is　not　　#{0}", count)).ToString();
    if (count > 5)
    {
      throw new InvalidProgramException(message, ex);
    }
    else
    {
      return FindWindowByProcessId(processId);
    }
  }
}

("{F5}");     //Send F5 button("^s");    //Send Ctrl + s key("%{F4}");   // Send Alt + F4 keys//Key button codeBACKSPACE {BACKSPACE}, {BS}, or {BKSP} 
BREAK {BREAK} 
CAPS LOCK {CAPSLOCK} 
DEL or DELETE {DELETE} or {DEL} 
DOWN ARROW {DOWN} 
END {END} 
ENTER {ENTER}or ~ 
ESC {ESC} 
HELP {HELP} 
HOME {HOME} 
INS or INSERT {INSERT} or {INS} 
LEFT ARROW {LEFT} 
NUM LOCK {NUMLOCK} 
PAGE DOWN {PGDN} 
PAGE UP {PGUP} 
PRINT SCREEN {PRTSC} 
RIGHT ARROW {RIGHT} 
("+{TAB}");
("%f");//alt+f
("{Tab}");
("{Enter}")
//Code of multiple key presses//To specify a duplicate key, use the form {key number}.  A space must be placed between the key and number.  //For example, {LEFT 42} means pressing the LEFT ARROW key 42 times; {h 10} means pressing the H key 10 times.

using System;
using ;
using ;
using ;
using ;
using ;
using ;
using ;
namespace UIATest
{
  class Program
  {
    static void Main(string[] args)
    {
      Process process = (@"E:\WorkBook\ATP\WpfApp\bin\Debug\");
      int processId = ;
      AutomationElement element = FindElementById(processId, "textBox1");
      SendKeys sendkeys = new SendKeys();
      (element, "Sending keys to input data");
      (());
      (element, );
      (());
      ("Test finised."); 
    }
    /// <summary>
    /// Get the automation elemention of current form.
    /// </summary>
    /// <param name="processId">Process Id</param>
    /// <returns>Target element</returns>
    public static AutomationElement FindWindowByProcessId(int processId)
    {
      AutomationElement targetWindow = null;
      int count = 0;
      try
      {
        Process p = (processId);
        targetWindow = ();
        return targetWindow;
      }
      catch (Exception ex)
      {
        count++;
        StringBuilder sb = new StringBuilder();
        string message = (("Target window is not  #{0}", count)).ToString();
        if (count > 5)
        {
          throw new InvalidProgramException(message, ex);
        }
        else
        {
          return FindWindowByProcessId(processId);
        }
      }
    }
    /// <summary>
    /// Get the automation element by automation Id.
    /// </summary>
    /// <param name="windowName">Window name</param>
    /// <param name="automationId">Control automation Id</param>
    /// <returns>Automatin element searched by automation Id</returns>
    public static AutomationElement FindElementById(int processId, string automationId)
    {
      AutomationElement aeForm = FindWindowByProcessId(processId);
      AutomationElement tarFindElement = (,
      new PropertyCondition(, automationId));
      return tarFindElement;
    }
  }
}