System.Windows.Forms.SendKeys

hi,
   Iam having a small problem in using the System.Windows.Forms.SendKeys API to send input to an active appication. I have an exe file for adding two numbers. I have to give input to that and get the result. My code ( which i have given below) works sometime and does not work someother time. It gives and unhandled exception error. can anyone tell me why?
 
   Dim myProcess As Process = New Process()
   myProcess.StartInfo.FileName = "Addition.exe"
   myProcess.StartInfo.WindowStyle = ProcessWindowStyle.Normal
   myProcess.EnableRaisingEvents = True
   myProcess.Start()
    Try
         If myProcess.Responding Then
           System.Windows.Forms.SendKeys.SendWait("2")
           System.Windows.Forms.SendKeys.SendWait("{ENTER}")
           System.Windows.Forms.SendKeys.SendWait("3")
           System.Windows.Forms.SendKeys.SendWait("{ENTER}")
           System.Windows.Forms.SendKeys.Send("{ENTER}")
           System.Windows.Forms.SendKeys.Flush()
         Else
            myProcess.Kill()
        End If

-sendhil

sendhil_anAsked:
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brother7Commented:
Lemme see if I understand this correctly...
1- The result is received back after the 2nd {ENTER}
2- The 3rd {ENTER}'s purpose is to try to end the process normally, ie in response to "Press any key to continue"

I would try the following:
   Add myProcess.CloseMainWindow() as the last statement of the If block, before the Else block.

Do you know the type of Exception that's occurring?
Add a Catch block, such as:
   Catch exceptionParameter as Exception
      MessageBox.Show(exceptionParameter.Message, "Caught Exception", MessageBoxButtons.OK, MessageBoxIcon.Error)
   End Try

Hope that helps some.
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Bob LearnedCommented:
No comment has been added lately, so it's time to clean up this TA.
I will leave the following recommendation for this question in the Cleanup topic area:

Accept: brother7 {http:#9624332}

Please leave any comments here within the next seven days.
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