VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   2145
   ClientLeft      =   5520
   ClientTop       =   4920
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   2145
   ScaleWidth      =   4680
   Begin VB.TextBox Text1 
      Height          =   375
      Left            =   600
      TabIndex        =   0
      Top             =   1080
      Width           =   3375
   End
   Begin VB.Label Label3 
      Caption         =   "半角の大文字のみ入力可"
      Height          =   180
      Left            =   1200
      TabIndex        =   3
      Top             =   720
      Width           =   1980
   End
   Begin VB.Label Label2 
      Caption         =   "　ＢＹ　ＭＡＤＩＡ"
      Height          =   180
      Left            =   3240
      TabIndex        =   2
      Top             =   1800
      Width           =   1110
   End
   Begin VB.Label Label1 
      Caption         =   "＜　テキストボックスの文字制御サンプルです　＞"
      Height          =   180
      Left            =   480
      TabIndex        =   1
      Top             =   240
      Width           =   3765
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Text1_KeyPress(KeyAscii As Integer)
    If KeyAscii >= Asc("A") And KeyAscii <= Asc("Z") Then
        '処理無し
        Exit Sub
    Else
        '文字が A - Z 以外の時の処理
        MsgBox "A 〜 Z の半角の大文字しか入力できません！！！"
        'KeyAscii = 0　とは入力した文字（キー）情報のクリアです
        KeyAscii = 0
        Text1.Text = NullSTRING
        Beep
    End If
End Sub