allora ho provato ad usare:
codice:
Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents btnTerminate As System.Windows.Forms.Button
    Friend WithEvents btnSendCloseMessage As System.Windows.Forms.Button
    Friend WithEvents txtTargetTitle As System.Windows.Forms.TextBox
    Friend WithEvents label1 As System.Windows.Forms.Label
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.btnTerminate = New System.Windows.Forms.Button
        Me.btnSendCloseMessage = New System.Windows.Forms.Button
        Me.txtTargetTitle = New System.Windows.Forms.TextBox
        Me.label1 = New System.Windows.Forms.Label
        Me.SuspendLayout()
        '
        'btnTerminate
        '
        Me.btnTerminate.Location = New System.Drawing.Point(128, 48)
        Me.btnTerminate.Name = "btnTerminate"
        Me.btnTerminate.Size = New System.Drawing.Size(72, 32)
        Me.btnTerminate.TabIndex = 7
        Me.btnTerminate.Text = "Terminate"
        '
        'btnSendCloseMessage
        '
        Me.btnSendCloseMessage.Location = New System.Drawing.Point(24, 48)
        Me.btnSendCloseMessage.Name = "btnSendCloseMessage"
        Me.btnSendCloseMessage.Size = New System.Drawing.Size(72, 32)
        Me.btnSendCloseMessage.TabIndex = 6
        Me.btnSendCloseMessage.Text = "Send Close Message"
        '
        'txtTargetTitle
        '
        Me.txtTargetTitle.Location = New System.Drawing.Point(80, 8)
        Me.txtTargetTitle.Name = "txtTargetTitle"
        Me.txtTargetTitle.Size = New System.Drawing.Size(120, 20)
        Me.txtTargetTitle.TabIndex = 5
        Me.txtTargetTitle.Text = "Target"
        '
        'label1
        '
        Me.label1.Location = New System.Drawing.Point(8, 8)
        Me.label1.Name = "label1"
        Me.label1.Size = New System.Drawing.Size(64, 16)
        Me.label1.TabIndex = 4
        Me.label1.Text = "Target Title"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(208, 85)
        Me.Controls.Add(Me.btnTerminate)
        Me.Controls.Add(Me.btnSendCloseMessage)
        Me.Controls.Add(Me.txtTargetTitle)
        Me.Controls.Add(Me.label1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Integer
    Private Declare Function GetWindowThreadProcessId Lib "user32" Alias "GetWindowThreadProcessId" (ByVal hwnd As Integer, ByRef lpdwProcessId As Integer) As Integer
    Private Declare Function OpenProcess Lib "kernel32" Alias "OpenProcess" (ByVal dwDesiredAccess As Integer, ByVal bInheritHandle As Integer, ByVal dwProcessId As Integer) As Integer
    Private Declare Function CloseHandle Lib "kernel32" Alias "CloseHandle" (ByVal hObject As Integer) As Integer
    Private Declare Function TerminateProcess Lib "kernel32" Alias "TerminateProcess" (ByVal hProcess As Integer, ByVal uExitCode As Integer) As Integer
    Private Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As Integer, ByVal wMsg As Integer, ByVal wParam As Integer, ByVal lParam As Integer) As Integer
    Private Const SYNCHRONIZE As Integer = &H100000
    Private Const PROCESS_TERMINATE As Integer = &H1
    Private Const WM_CLOSE As Integer = &H10

    ' Send the target the WM_CLOSE message.
    Private Sub btnSendCloseMessage_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSendCloseMessage.Click
        ' Get the target's window handle.
        Dim target_hwnd As Integer = FindWindow(vbNullString, txtTargetTitle.Text)
        If (target_hwnd = 0) Then
            MessageBox.Show("Error finding target window handle")
            Exit Sub
        End If

        ' Send the application the WM_CLOSE message.
        PostMessage(target_hwnd, WM_CLOSE, 0, 0)
        MessageBox.Show("Sent WM_CLOSE message")
    End Sub

    ' Terminate the target.
    Private Sub btnTerminate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnTerminate.Click
        Dim target_hwnd, target_process_id, target_process_handle As Integer

        ' Get the target's window handle.
        target_hwnd = FindWindow(vbNullString, txtTargetTitle.Text)
        If (target_hwnd = 0) Then
            MessageBox.Show("Error finding target window handle")
            Exit Sub
        End If

        ' Get the process ID.
        target_process_id = 0
        GetWindowThreadProcessId(target_hwnd, target_process_id)
        If (target_process_id = 0) Then
            MessageBox.Show("Error finding target process ID")
            Exit Sub
        End If

        ' Open the process.
        target_process_handle = OpenProcess( _
            SYNCHRONIZE Or PROCESS_TERMINATE, _
            0, target_process_id)

        If (target_process_handle = 0) Then
            MessageBox.Show("Error finding target process handle")
            Exit Sub
        End If

        ' Terminate the process.
        If (TerminateProcess(target_process_handle, 0) = 0) Then
            MessageBox.Show("Error terminating process")
        Else
            MessageBox.Show("Process terminated")
        End If

        ' Close the process.
        CloseHandle(target_process_handle)
    End Sub
End Class
ma mi dā :
MessageBox.Show("Error finding target process handle")
il Target č SplitCam.exe
č non chiude l'applicazione