/// <summary>
        /// This message is sent by an application to simulate the user clicking a button. This message causes the button to receive a WM_LBUTTONDOWN and a WM_LBUTTONUP message, and the button's parent window to receive a BN_CLICKED message.
        /// </summary>
        public enum ButtonControlMessages: uint
        {
            BM_GETCHECK = 0x00F0,
            BM_SETCHECK = 0x00F1,
            BM_GETSTATE = 0x00F2,
            BM_SETSTATE = 0x00F3,
            BM_SETSTYLE = 0x00F4,
            BM_CLICK    = 0x00F5,
            BM_GETIMAGE = 0x00F6,
            BM_SETIMAGE = 0x00F7
        }

Example

// buttonWindowHandle - handle of Button window

SendMessage(buttonWindowHandle, BM_CLICK, (IntPtr)0, (IntPtr)0);

Example VB.net

    <Runtime.InteropServices.DllImport("user32.dll", SetLastError:=True, CharSet:=Runtime.InteropServices.CharSet.Auto)> _
    Public Shared Function SendMessage(ByVal hWnd As IntPtr, ByVal Msg As UInteger, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As IntPtr
    End Function

    Public BM_CLICK As Integer = &HF5

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    SendMessage(Me.Button2.Handle, BM_CLICK, 0, 0)
    'The same
    Button2_Click(sender, e)
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
    MessageBox.Show("Click")
    End Sub

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