End a process

[engnouna]

Hi

I have a TextBox in which the user enters the filename of the file that he wants to display and a Button
I am using the process class to open files of any type(.xls,.pdf,.doc,.xml)...
when the user clicks on a button, it displays the filename mentioned in the textbox,and if he presses on the button for a second time and the textbox has changed,it should close the previous file and then open the new file.
how can I do that so only one file is opened?(If the first file is an excel and the second filename is a txt document, then I should close the excel file and then open the text document)
the code I am using is:

Imports System 
Imports System.Collections.Generic 
Imports System.ComponentModel 
Imports System.Data 
Imports System.Drawing 
Imports System.Linq 
Imports System.Text 
Imports System.Windows.Forms 
Imports System.Diagnostics 

Namespace WindowsFormsApplication3 
    Public Partial Class Form1 
        Inherits Form 
        Private p As New Process() 
        
        Public Sub New() 
            InitializeComponent() 
        End Sub 
        
        Private Sub button1_Click(ByVal sender As Object, ByVal e As EventArgs) 
            p.StartInfo = New System.Diagnostics.ProcessStartInfo(textBox1.Text) 
            p.Start() 
        End Sub 
    End Class 
End Namespace

[gautamshaw]

If processA, ProcessB is running then END ProcessC. If however ProcessA, and ProcessB are not running then ProcessC can stay active. This code is shown below.

Dim ProcessARunning as Boolean 
                Dim ProcessBRunning as Boolean 
 
                Dim AProcess As Process() = System.Diagnostics.Process.GetProcessesByName("ProgramA") 
                If AProcess.count <> 0 Then 
                   ProcessARunning = True 
                Else 
                   ProcessBRunning = False 
                End If 
 
                Dim BProcess As Process() = System.Diagnostics.Process.GetProcessesByName("ProgramB") 
 
           If BProcess.count <> 0 Then 
                   ProcessBRunning = True 
                Else 
                   ProcessBRunning = False 
                End If 
 
                If ProcessARunning = True and ProcessBRunning = True then 
                   Dim CProcess() As Process = System.Diagnostics.Process.GetProcessesByName("ProgramC") 
 
                   For Each Program As Process In CProcess 
                           Program.Kill() 
                   Next

[gautamshaw]

To kill a process:

' Kill all notepad process
Dim pProcess() As Process = System.Diagnostics.Process.GetProcessesByName("notepad")

For Each p As Process In pProcess
p.Kill()
Next

understand it and try to implement it in your project according to your need......